On Wed, 14 Oct 2015, Robert LeBlanc wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > It seems in our situation the cluster is just busy, usually with > really small RBD I/O. We have gotten things to where it doesn't happen > as much in a steady state, but when we have an OSD fail (mostly from > an XFS log bug we hit at least once a week), it is very painful as the > OSD exits and enters the cluster. We are working to split the PGs a > couple of fold, but this is a painful process for the reasons > mentioned in the tracker. Matt Benjamin and Sam Just had a discussion > on IRC about getting the other primaries to throttle back when such a > situation occurs so that each primary OSD has some time to service > client I/O and to push back on the clients to slow down in these > situations. > > In our case a single OSD can lock up a VM for a very long time while > others are happily going about their business. Instead of looking like > the cluster is out of I/O, it looks like there is an error. If > pressure is pushed back to clients, it would show up as all of the > clients slowing down a little instead of one or two just hanging for > even over 1,000 seconds. This 1000 seconds figure is very troubling. Do you have logs? I suspect this is a different issue than the prioritization one in the log from the other day (which only waited about 30s for higher-priority replica requests). > My thoughts is that each OSD should have some percentage to time given > to servicing client I/O whereas now it seems that replica I/O can > completely starve client I/O. I understand why replica traffic needs a > higher priority, but I think some balance needs to be attained. We currently do 'fair' prioritized queueing with a token bucket filter only for requests with priorities <= 63. Simply increasing this threshold so that it covers replica requests might be enough. But... we'll be starting client requests locally at the expense of in-progress client writes elsewhere. Given that the amount of (our) client-related work we do is always bounded by the msgr throttle, I think this is okay since we only make the situation worse by a fixed factor. (We still don't address the possibilty that we are replica for every other osd in the system and could be flooded by N*(max client ops per osd). It's this line: https://github.com/ceph/ceph/blob/master/src/osd/OSD.cc#L8334 sage > > Thanks, > -----BEGIN PGP SIGNATURE----- > Version: Mailvelope v1.2.0 > Comment: https://www.mailvelope.com > > wsFcBAEBCAAQBQJWHne4CRDmVDuy+mK58QAAwYUP/RzTrmsYV7Vi6e64Yikh > YMMI4Cxt4mBWbTIOsb8iRY98EkqhUWd/kz45OoFQgwE4hS3O5Lksf3u0pcmS > I+Gz6jQ4/K0B6Mc3Rt19ofD1cA9s6BLnHSqTFZEUVapiHftj84ewIRLts9dg > YCJJeaaOV8fu07oZvnumRTAKOzWPyQizQKBGx7nujIg13Us0st83C8uANzoX > hKvlA2qVMXO4rLgR7nZMcgj+X+/79v7MDycM3WP/Q21ValsNfETQVhN+XxC8 > D/IUfX4/AKUEuF4WBEck4Z/Wx9YD+EvpLtQVLy21daazRApWES/iy089F63O > k9RHp189c4WCduFBaTvZj2cdekAq/Wl50O1AdafYFptWqYhw+aKpihI+yMrX > +LhWgoYALD6wyXr0KVDZZszIRZbO/PSjct8z13aXBJoJm9r0Vyazfhi9jNW9 > Z/1GD7gv5oHymf7eR9u7T8INdjNzn6Qllj7XCyZfQv5TYxsRWMZxf5vEkpMB > nAYANoZcNs4ZSIy+OdFOb6nM66ujrytWL1DqWusJUEM/GauBw0fxnQ/i+pMy > XU8gYbG1um5YY8jrtvvkhnbHdeO/k24/cH7MGslxeezBPnMNzmqj3qVdiX1H > EBbyBBtp8OF+pKExrmZc2w01W/Nxl6GbVoG+IKJ61FgwKOXEiMwb0wv5mu30 > eP3D > =R0O9 > -----END PGP SIGNATURE----- > ---------------- > Robert LeBlanc > PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > > > On Wed, Oct 14, 2015 at 12:00 AM, Haomai Wang <haomaiwang@xxxxxxxxx> wrote: > > On Wed, Oct 14, 2015 at 1:03 AM, Sage Weil <sweil@xxxxxxxxxx> wrote: > >> On Mon, 12 Oct 2015, Robert LeBlanc wrote: > >>> -----BEGIN PGP SIGNED MESSAGE----- > >>> Hash: SHA256 > >>> > >>> After a weekend, I'm ready to hit this from a different direction. > >>> > >>> I replicated the issue with Firefly so it doesn't seem an issue that > >>> has been introduced or resolved in any nearby version. I think overall > >>> we may be seeing [1] to a great degree. From what I can extract from > >>> the logs, it looks like in situations where OSDs are going up and > >>> down, I see I/O blocked at the primary OSD waiting for peering and/or > >>> the PG to become clean before dispatching the I/O to the replicas. > >>> > >>> In an effort to understand the flow of the logs, I've attached a small > >>> 2 minute segment of a log I've extracted what I believe to be > >>> important entries in the life cycle of an I/O along with my > >>> understanding. If someone would be kind enough to help my > >>> understanding, I would appreciate it. > >>> > >>> 2015-10-12 14:12:36.537906 7fb9d2c68700 10 -- 192.168.55.16:6800/11295 > >>> >> 192.168.55.12:0/2013622 pipe(0x26c90000 sd=47 :6800 s=2 pgs=2 cs=1 > >>> l=1 c=0x32c85440).reader got message 19 0x2af81700 > >>> osd_op(client.6709.0:67 rbd_data.103c74b0dc51.000000000000003a > >>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> 0~4194304] 0.474a01a9 ack+ondisk+write+known_if_redirected e44) v5 > >>> > >>> - ->Messenger has recieved the message from the client (previous > >>> entries in the 7fb9d2c68700 thread are the individual segments that > >>> make up this message). > >>> > >>> 2015-10-12 14:12:36.537963 7fb9d2c68700 1 -- 192.168.55.16:6800/11295 > >>> <== client.6709 192.168.55.12:0/2013622 19 ==== > >>> osd_op(client.6709.0:67 rbd_data.103c74b0dc51.000000000000003a > >>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> 0~4194304] 0.474a01a9 ack+ondisk+write+known_if_redirected e44) v5 > >>> ==== 235+0+4194304 (2317308138 0 2001296353) 0x2af81700 con 0x32c85440 > >>> > >>> - ->OSD process acknowledges that it has received the write. > >>> > >>> 2015-10-12 14:12:36.538096 7fb9d2c68700 15 osd.4 44 enqueue_op > >>> 0x3052b300 prio 63 cost 4194304 latency 0.012371 > >>> osd_op(client.6709.0:67 rbd_data.103c74b0dc51.000000000000003a > >>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> 0~4194304] 0.474a01a9 ack+ondisk+write+known_if_redirected e44) v5 > >>> > >>> - ->Not sure excatly what is going on here, the op is being enqueued somewhere.. > >>> > >>> 2015-10-12 14:13:06.542819 7fb9e2d3a700 10 osd.4 44 dequeue_op > >>> 0x3052b300 prio 63 cost 4194304 latency 30.017094 > >>> osd_op(client.6709.0:67 rbd_data.103c74b0dc51.000000000000003a > >>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> 0~4194304] 0.474a01a9 ack+ondisk+write+known_if_redirected e44) v > >>> 5 pg pg[0.29( v 44'703 (0'0,44'703] local-les=40 n=641 ec=1 les/c > >>> 40/44 32/32/10) [4,5,0] r=0 lpr=32 crt=44'700 lcod 44'702 mlcod 44'702 > >>> active+clean] > >>> > >>> - ->The op is dequeued from this mystery queue 30 seconds later in a > >>> different thread. > >> > >> ^^ This is the problem. Everything after this looks reasonable. Looking > >> at the other dequeue_op calls over this period, it looks like we're just > >> overwhelmed with higher priority requests. New clients are 63, while > >> osd_repop (replicated write from another primary) are 127 and replies from > >> our own replicated ops are 196. We do process a few other prio 63 items, > >> but you'll see that their latency is also climbing up to 30s over this > >> period. > >> > >> The question is why we suddenly get a lot of them.. maybe the peering on > >> other OSDs just completed so we get a bunch of these? It's also not clear > >> to me what makes osd.4 or this op special. We expect a mix of primary and > >> replica ops on all the OSDs, so why would we suddenly have more of them > >> here.... > > > > I guess the bug tracker(http://tracker.ceph.com/issues/13482) is > > related to this thread. > > > > So is it means that there exists live lock with client op and repop? > > We permit all clients issue too much client ops which cause some OSDs > > bottleneck, then actually other OSDs maybe idle enough and accept more > > client ops. Finally, all osds are stuck into the bottleneck OSD. It > > seemed reasonable, but why it will last so long? > > > >> > >> sage > >> > >> > >>> > >>> 2015-10-12 14:13:06.542912 7fb9e2d3a700 10 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'703 (0'0,44'703] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 crt=44'700 lcod 44'702 mlcod 44'702 active+clean] > >>> do_op osd_op(client.6709.0:67 rbd_data.103c74b0dc51.000000000000003a > >>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> 0~4194304] 0.474a01a9 ack+ondisk+write+known_if_redirected e44) v5 > >>> may_write -> write-ordered flags ack+ondisk+write+known_if_redirected > >>> > >>> - ->Not sure what this message is. Look up of secondary OSDs? > >>> > >>> 2015-10-12 14:13:06.544999 7fb9e2d3a700 10 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'703 (0'0,44'703] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 crt=44'700 lcod 44'702 mlcod 44'702 active+clean] > >>> new_repop rep_tid 17815 on osd_op(client.6709.0:67 > >>> rbd_data.103c74b0dc51.000000000000003a [set-alloc-hint object_size > >>> 4194304 write_size 4194304,write 0~4194304] 0.474a01a9 > >>> ack+ondisk+write+known_if_redirected e44) v5 > >>> > >>> - ->Dispatch write to secondaty OSDs? > >>> > >>> 2015-10-12 14:13:06.545116 7fb9e2d3a700 1 -- 192.168.55.16:6801/11295 > >>> --> 192.168.55.15:6801/32036 -- osd_repop(client.6709.0:67 0.29 > >>> 474a01a9/rbd_data.103c74b0dc51.000000000000003a/head//0 v 44'704) v1 > >>> -- ?+4195078 0x238fd600 con 0x32bcb5a0 > >>> > >>> - ->OSD dispatch write to OSD.0. > >>> > >>> 2015-10-12 14:13:06.545132 7fb9e2d3a700 20 -- 192.168.55.16:6801/11295 > >>> submit_message osd_repop(client.6709.0:67 0.29 > >>> 474a01a9/rbd_data.103c74b0dc51.000000000000003a/head//0 v 44'704) v1 > >>> remote, 192.168.55.15:6801/32036, have pipe. > >>> > >>> - ->Message sent to OSD.0. > >>> > >>> 2015-10-12 14:13:06.545195 7fb9e2d3a700 1 -- 192.168.55.16:6801/11295 > >>> --> 192.168.55.11:6801/13185 -- osd_repop(client.6709.0:67 0.29 > >>> 474a01a9/rbd_data.103c74b0dc51.000000000000003a/head//0 v 44'704) v1 > >>> -- ?+4195078 0x16edd200 con 0x3a37b20 > >>> > >>> - ->OSD dispatch write to OSD.5. > >>> > >>> 2015-10-12 14:13:06.545210 7fb9e2d3a700 20 -- 192.168.55.16:6801/11295 > >>> submit_message osd_repop(client.6709.0:67 0.29 > >>> 474a01a9/rbd_data.103c74b0dc51.000000000000003a/head//0 v 44'704) v1 > >>> remote, 192.168.55.11:6801/13185, have pipe. > >>> > >>> - ->Message sent to OSD.5. > >>> > >>> 2015-10-12 14:13:06.545229 7fb9e2d3a700 10 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'703 (0'0,44'703] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 crt=44'700 lcod 44'702 mlcod 44'702 active+clean] > >>> append_log log((0'0,44'703], crt=44'700) [44'704 (44'691) modify > >>> 474a01a9/rbd_data.103c74b0dc51.000000000000003a/head//0 by > >>> client.6709.0:67 2015-10-12 14:12:34.340082] > >>> 2015-10-12 14:13:06.545268 7fb9e2d3a700 10 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 luod=44'703 lua=44'703 crt=44'700 lcod 44'702 mlcod > >>> 44'702 active+clean] add_log_entry 44'704 (44'691) modify > >>> 474a01a9/rbd_data.103c74b0dc51.000000000000003a/head//0 by > >>> client.6709.0:67 2015-10-12 14:12:34.340082 > >>> > >>> - ->These record the OP in the journal log? > >>> > >>> 2015-10-12 14:13:06.563241 7fb9d326e700 20 -- 192.168.55.16:6801/11295 > >>> >> 192.168.55.11:6801/13185 pipe(0x2d355000 sd=98 :6801 s=2 pgs=12 > >>> cs=3 l=0 c=0x3a37b20).writer encoding 17337 features 37154696925806591 > >>> 0x16edd200 osd_repop(client.6709.0:67 0.29 > >>> 474a01a9/rbd_data.103c74b0dc51.000000000000003a/head//0 v 44'704) v1 > >>> > >>> - ->Writing the data to OSD.5? > >>> > >>> 2015-10-12 14:13:06.573938 7fb9d3874700 10 -- 192.168.55.16:6801/11295 > >>> >> 192.168.55.15:6801/32036 pipe(0x3f96000 sd=176 :6801 s=2 pgs=8 cs=3 > >>> l=0 c=0x32bcb5a0).reader got ack seq 1206 >= 1206 on 0x238fd600 > >>> osd_repop(client.6709.0:67 0.29 > >>> 474a01a9/rbd_data.103c74b0dc51.000000000000003a/head//0 v 44'704) v1 > >>> > >>> - ->Messenger gets ACK from OSD.0 that it reveiced that last packet? > >>> > >>> 2015-10-12 14:13:06.613425 7fb9d3874700 10 -- 192.168.55.16:6801/11295 > >>> >> 192.168.55.15:6801/32036 pipe(0x3f96000 sd=176 :6801 s=2 pgs=8 cs=3 > >>> l=0 c=0x32bcb5a0).reader got message 1146 0x3ffa480 > >>> osd_repop_reply(client.6709.0:67 0.29 ondisk, result = 0) v1 > >>> > >>> - ->Messenger receives ack on disk from OSD.0. > >>> > >>> 2015-10-12 14:13:06.613447 7fb9d3874700 1 -- 192.168.55.16:6801/11295 > >>> <== osd.0 192.168.55.15:6801/32036 1146 ==== > >>> osd_repop_reply(client.6709.0:67 0.29 ondisk, result = 0) v1 ==== > >>> 83+0+0 (2772408781 0 0) 0x3ffa480 con 0x32bcb5a0 > >>> > >>> - ->OSD process gets on disk ACK from OSD.0. > >>> > >>> 2015-10-12 14:13:06.613478 7fb9d3874700 10 osd.4 44 handle_replica_op > >>> osd_repop_reply(client.6709.0:67 0.29 ondisk, result = 0) v1 epoch 44 > >>> > >>> - ->Primary OSD records the ACK (duplicate message?). Not sure how to > >>> correlate that to the previous message other than by time. > >>> > >>> 2015-10-12 14:13:06.613504 7fb9d3874700 15 osd.4 44 enqueue_op > >>> 0x120f9b00 prio 196 cost 0 latency 0.000250 > >>> osd_repop_reply(client.6709.0:67 0.29 ondisk, result = 0) v1 > >>> > >>> - ->The reply is enqueued onto a mystery queue. > >>> > >>> 2015-10-12 14:13:06.627793 7fb9d6afd700 10 -- 192.168.55.16:6801/11295 > >>> >> 192.168.55.11:6801/13185 pipe(0x2d355000 sd=98 :6801 s=2 pgs=12 > >>> cs=3 l=0 c=0x3a37b20).reader got ack seq 17337 >= 17337 on 0x16edd200 > >>> osd_repop(client.6709.0:67 0.29 > >>> 474a01a9/rbd_data.103c74b0dc51.000000000000003a/head//0 v 44'704) v1 > >>> > >>> - ->Messenger gets ACK from OSD.5 that it reveiced that last packet? > >>> > >>> 2015-10-12 14:13:06.628364 7fb9d6afd700 10 -- 192.168.55.16:6801/11295 > >>> >> 192.168.55.11:6801/13185 pipe(0x2d355000 sd=98 :6801 s=2 pgs=12 > >>> cs=3 l=0 c=0x3a37b20).reader got message 16477 0x21cef3c0 > >>> osd_repop_reply(client.6709.0:67 0.29 ondisk, result = 0) v1 > >>> > >>> - ->Messenger receives ack on disk from OSD.5. > >>> > >>> 2015-10-12 14:13:06.628382 7fb9d6afd700 1 -- 192.168.55.16:6801/11295 > >>> <== osd.5 192.168.55.11:6801/13185 16477 ==== > >>> osd_repop_reply(client.6709.0:67 0.29 ondisk, result = 0) v1 ==== > >>> 83+0+0 (2104182993 0 0) 0x21cef3c0 con 0x3a37b20 > >>> > >>> - ->OSD process gets on disk ACK from OSD.5. > >>> > >>> 2015-10-12 14:13:06.628406 7fb9d6afd700 10 osd.4 44 handle_replica_op > >>> osd_repop_reply(client.6709.0:67 0.29 ondisk, result = 0) v1 epoch 44 > >>> > >>> - ->Primary OSD records the ACK (duplicate message?). Not sure how to > >>> correlate that to the previous message other than by time. > >>> > >>> 2015-10-12 14:13:06.628426 7fb9d6afd700 15 osd.4 44 enqueue_op > >>> 0x3e41600 prio 196 cost 0 latency 0.000180 > >>> osd_repop_reply(client.6709.0:67 0.29 ondisk, result = 0) v1 > >>> > >>> - ->The reply is enqueued onto a mystery queue. > >>> > >>> 2015-10-12 14:13:07.124206 7fb9f4e9f700 0 log_channel(cluster) log > >>> [WRN] : slow request 30.598371 seconds old, received at 2015-10-12 > >>> 14:12:36.525724: osd_op(client.6709.0:67 > >>> rbd_data.103c74b0dc51.000000000000003a [set-alloc-hint object_size > >>> 4194304 write_size 4194304,write 0~4194304] 0.474a01a9 > >>> ack+ondisk+write+known_if_redirected e44) currently waiting for subops > >>> from 0,5 > >>> > >>> - ->OP has not been dequeued to the client from the mystery queue yet. > >>> > >>> 2015-10-12 14:13:07.278449 7fb9e2d3a700 10 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 luod=44'703 lua=44'703 crt=44'702 lcod 44'702 mlcod > >>> 44'702 active+clean] eval_repop repgather(0x37ea3cc0 44'704 > >>> rep_tid=17815 committed?=0 applied?=0 lock=0 > >>> op=osd_op(client.6709.0:67 rbd_data.103c74b0dc51.000000000000003a > >>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> 0~4194304] 0.474a01a9 ack+ondisk+write+known_if_redirected e44) v5) > >>> wants=ad > >>> > >>> - ->Not sure what this means. The OP has been completed on all replicas? > >>> > >>> 2015-10-12 14:13:07.278566 7fb9e0535700 10 osd.4 44 dequeue_op > >>> 0x120f9b00 prio 196 cost 0 latency 0.665312 > >>> osd_repop_reply(client.6709.0:67 0.29 ondisk, result = 0) v1 pg > >>> pg[0.29( v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 > >>> 32/32/10) [4,5,0] r=0 lpr=32 luod=44'703 lua=44'703 crt=44'702 lcod > >>> 44'702 mlcod 44'702 active+clean] > >>> > >>> - ->One of the replica OPs is dequeued in a different thread > >>> > >>> 2015-10-12 14:13:07.278809 7fb9e0535700 10 osd.4 44 dequeue_op > >>> 0x3e41600 prio 196 cost 0 latency 0.650563 > >>> osd_repop_reply(client.6709.0:67 0.29 ondisk, result = 0) v1 pg > >>> pg[0.29( v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 > >>> 32/32/10) [4,5,0] r=0 lpr=32 luod=44'703 lua=44'703 crt=44'702 lcod > >>> 44'702 mlcod 44'702 active+clean] > >>> > >>> - ->The other replica OP is dequeued in the new thread > >>> > >>> 2015-10-12 14:13:07.967469 7fb9efe95700 10 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 lua=44'703 crt=44'702 lcod 44'703 mlcod 44'702 > >>> active+clean] eval_repop repgather(0x37ea3cc0 44'704 rep_tid=17815 > >>> committed?=1 applied?=0 lock=0 op=osd_op(client.6709.0:67 > >>> rbd_data.103c74b0dc51.000000000000003a [set-alloc-hint object_size > >>> 4194304 write_size 4194304,write 0~4194304] 0.474a01a9 > >>> ack+ondisk+write+known_if_redirected e44) v5) wants=ad > >>> > >>> - ->Not sure what this does. A thread that joins the replica OPs with > >>> the primary OP? > >>> > >>> 2015-10-12 14:13:07.967515 7fb9efe95700 15 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 lua=44'703 crt=44'702 lcod 44'703 mlcod 44'702 > >>> active+clean] log_op_stats osd_op(client.6709.0:67 > >>> rbd_data.103c74b0dc51.000000000000003a [set-alloc-hint object_size > >>> 4194304 write_size 4194304,write 0~4194304] 0.474a01a9 > >>> ack+ondisk+write+known_if_redirected e44) v5 inb 4194304 outb 0 rlat > >>> 0.000000 lat 31.441789 > >>> > >>> - ->Logs that the write has been committed to all replicas in the > >>> primary journal? > >>> > >>> Not sure what the rest of these do, nor do I understand where the > >>> client gets an ACK that the write is committed. > >>> > >>> 2015-10-12 14:13:07.967583 7fb9efe95700 10 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 lua=44'703 crt=44'702 lcod 44'703 mlcod 44'702 > >>> active+clean] sending commit on repgather(0x37ea3cc0 44'704 > >>> rep_tid=17815 committed?=1 applied?=0 lock=0 > >>> op=osd_op(client.6709.0:67 rbd_data.103c74b0dc51.000000000000003a > >>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> 0~4194304] 0.474a01a9 ack+ondisk+write+known_if_redirected e44) v5) > >>> 0x3a2f0840 > >>> > >>> 2015-10-12 14:13:10.351452 7fb9f0696700 10 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 crt=44'702 lcod 44'703 mlcod 44'702 active+clean] > >>> eval_repop repgather(0x37ea3cc0 44'704 rep_tid=17815 committed?=1 > >>> applied?=1 lock=0 op[0/1943]client.6709.0:67 > >>> rbd_data.103c74b0dc51.000000000000003a [set-alloc-hint object_size > >>> 4194304 write_size 4194304,write 0~4194304] 0.474a01a9 > >>> ack+ondisk+write+known_if_redirected e44) v5) wants=ad > >>> > >>> 2015-10-12 14:13:10.354089 7fb9f0696700 10 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 crt=44'702 lcod 44'703 mlcod 44'703 active+clean] > >>> removing repgather(0x37ea3cc0 44'704 rep_tid=17815 committed?=1 > >>> applied?=1 lock=0 op=osd_op(client.6709.0:67 > >>> rbd_data.103c74b0dc51.000000000000003a [set-alloc-hint object_size > >>> 4194304 write_size 4194304,write 0~4194304] 0.474a01a9 > >>> ack+ondisk+write+known_if_redirected e44) v5) > >>> > >>> 2015-10-12 14:13:10.354163 7fb9f0696700 20 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 crt=44'702 lcod 44'703 mlcod 44'703 active+clean] > >>> q front is repgather(0x37ea3cc0 44'704 rep_tid=17815 committed?=1 > >>> applied?=1 lock=0 op=osd_op(client.6709.0:67 > >>> rbd_data.103c74b0dc51.000000000000003a [set-alloc-hint object_size > >>> 4194304 write_size 4194304,write 0~4194304] 0.474a01a9 > >>> ack+ondisk+write+known_if_redirected e44) v5) > >>> > >>> 2015-10-12 14:13:10.354199 7fb9f0696700 20 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'704 (0'0,44'704] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 crt=44'702 lcod 44'703 mlcod 44'703 active+clean] > >>> remove_repop repgather(0x37ea3cc0 44'704 rep_tid=17815 committed?=1 > >>> applied?=1 lock=0 op=osd_op(client.6709.0:67 > >>> rbd_data.103c74b0dc51.000000000000003a [set-alloc-hint object_size > >>> 4194304 write_size 4194304,write 0~4194304] 0.474a01a9 > >>> ack+ondisk+write+known_if_redirected e44) v5) > >>> > >>> 2015-10-12 14:13:15.488448 7fb9e2d3a700 10 osd.4 pg_epoch: 44 pg[0.29( > >>> v 44'707 (0'0,44'707] local-les=40 n=641 ec=1 les/c 40/44 32/32/10) > >>> [4,5,0] r=0 lpr=32 luod=44'705 lua=44'705 crt=44'704 lcod 44'704 mlcod > >>> 44'704 active+clean] append_log: trimming to 44'704 entries 44'704 > >>> (44'691) modify > >>> 474a01a9/rbd_data.103c74b0dc51.000000000000003a/head//0 by > >>> client.6709.0:67 2015-10-12 14:12:34.340082 > >>> > >>> Thanks for hanging in there with me on this... > >>> > >>> [1] http://www.spinics.net/lists/ceph-devel/msg26633.html > >>> -----BEGIN PGP SIGNATURE----- > >>> Version: Mailvelope v1.2.0 > >>> Comment: https://www.mailvelope.com > >>> > >>> wsFcBAEBCAAQBQJWHCx0CRDmVDuy+mK58QAAXf8P/j6MD52r2DLqOP9hKFAP > >>> MJUktg8uqK1i8awtuIQhJHAPDZQF8EACOXg6RBuOz75iryCFKAJXk5exLXrE > >>> pIZqY/0/JCsUEPuQGaMY9GVQNrTeB82F5VIu572i2xeFir4fUEcvllXSeR9O > >>> CxSgaAncxUYGSXwsiCJ28QhwPCFXtCLACg1eTpghhAcOwY0t+z6ZB3vh+WxB > >>> B8kRCdee78TVZOgeTnd66aBJUrr21Ir9aPqSm73uY561dyDmyxc4zPq+FDsJ > >>> kuac+Ky9Lc6rqhxwRptbdx5i/EDzxj96EKEz2v4SFBmvzU8jtZlA8THJ6WlF > >>> 6lZRpRIMfEqVu4neFcdUIct8+Brf7fuxOI7hbhUL5xq2I6yDSY8E2T8ImRoS > >>> w8bSrjFV3wmnXSCHnFJPROqdhtlQlH1PkKPBRJeJrkrB1MloX0ybU4hNIr7Q > >>> 4ZyzeLpD9sgL1vEfUVuCksgiVJhzlFOyqeRHcfpPEnLxyGL/+mLUa5lQ5m5l > >>> m286ZnsMZGMzAdSA/tsqnTFzL0HbjkiWD/OMU5zThSKW2tZBNWg3xZE5Yia9 > >>> zAbhxpvxqhKQ7nfmv3xeVJ1GKb9CuzfN9ZIGPltHvpA3rZf3I4+XVlWbbhDZ > >>> z8Xp8Pw8f7neh89Tv3AT+krM1jrE1ZxOF5A2K4CxBcS3OEMc5UIZ2fy4dHSo > >>> 0iTE > >>> =t7nL > >>> -----END PGP SIGNATURE----- > >>> ---------------- > >>> Robert LeBlanc > >>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> > >>> > >>> On Thu, Oct 8, 2015 at 11:44 PM, Robert LeBlanc <robert@xxxxxxxxxxxxx> wrote: > >>> > -----BEGIN PGP SIGNED MESSAGE----- > >>> > Hash: SHA256 > >>> > > >>> > Sage, > >>> > > >>> > After trying to bisect this issue (all test moved the bisect towards > >>> > Infernalis) and eventually testing the Infernalis branch again, it > >>> > looks like the problem still exists although it is handled a tad > >>> > better in Infernalis. I'm going to test against Firefly/Giant next > >>> > week and then try and dive into the code to see if I can expose any > >>> > thing. > >>> > > >>> > If I can do anything to provide you with information, please let me know. > >>> > > >>> > Thanks, > >>> > -----BEGIN PGP SIGNATURE----- > >>> > Version: Mailvelope v1.2.0 > >>> > Comment: https://www.mailvelope.com > >>> > > >>> > wsFcBAEBCAAQBQJWF1QlCRDmVDuy+mK58QAAWLgP/2l+TkcpeKihDxF8h/kw > >>> > YFffNWODNfOMq8FVDQkQceo2mFCFc29JnBYiAeqW+XPelwuU5S86LG998aUB > >>> > BvIU4EHaJNJ31X1NCIA7nwi8rXlFYfSG2qQn58+IzqZoWCQM5vD/THISV1rP > >>> > qQKtoOAEuRxz+vOAJGI1A1xJSOiFwTRjs4LjE1zYjSP26LdEF61D/lb+AVzV > >>> > ufxi/ci6mAla/4VTAH4VqEviDgC8AbAZnWFGfUPcTUxJQS99kFrfjJnWvgyF > >>> > V9EmWtQCvhRO74hQLBqspOwdAxEJesPfGcJT1LjR0eEAMWvbGPtaqbSFAEWa > >>> > jjyy5wP9+4NnGLdhba6UBtLphjqTcl0e2vVwRj0zLhI14moAOlbhIKmZ1Dt+ > >>> > 1P6vfgOUGvO76xgDMwrVKRoQgWJO/0Tup9+oqInnNYgf4W+ZWsLgLgo7ETAF > >>> > VcI7LP1wkwAI3lz5YphY/TnKNGs6i+wVjKBamOt3R1yz9WeylaG0T6xgGHrs > >>> > VugrRSUuO+ND9+mE5EsUgITCZoaavXJESJMb30XkK6hYGB+T/q+hBafc6Wle > >>> > Jgs+aT2m1erdSyZn0ZC9a6CjWmwJXY6FCSGhE53BbefBxmCFxn+8tVav+Q8W > >>> > 7s14TntP6ex4ca7eTwGuSXC9FU5fAVa+3+3aXDAC1QPAkeVkXyB716W1XG6b > >>> > BCFo > >>> > =GJL4 > >>> > -----END PGP SIGNATURE----- > >>> > ---------------- > >>> > Robert LeBlanc > >>> > PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> > > >>> > > >>> > On Wed, Oct 7, 2015 at 1:25 PM, Robert LeBlanc <robert@xxxxxxxxxxxxx> wrote: > >>> >> -----BEGIN PGP SIGNED MESSAGE----- > >>> >> Hash: SHA256 > >>> >> > >>> >> We forgot to upload the ceph.log yesterday. It is there now. > >>> >> - ---------------- > >>> >> Robert LeBlanc > >>> >> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >> > >>> >> > >>> >> On Tue, Oct 6, 2015 at 5:40 PM, Robert LeBlanc wrote: > >>> >>> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>> Hash: SHA256 > >>> >>> > >>> >>> I upped the debug on about everything and ran the test for about 40 > >>> >>> minutes. I took OSD.19 on ceph1 doen and then brought it back in. > >>> >>> There was at least one op on osd.19 that was blocked for over 1,000 > >>> >>> seconds. Hopefully this will have something that will cast a light on > >>> >>> what is going on. > >>> >>> > >>> >>> We are going to upgrade this cluster to Infernalis tomorrow and rerun > >>> >>> the test to verify the results from the dev cluster. This cluster > >>> >>> matches the hardware of our production cluster but is not yet in > >>> >>> production so we can safely wipe it to downgrade back to Hammer. > >>> >>> > >>> >>> Logs are located at http://dev.v3trae.net/~jlavoy/ceph/logs/ > >>> >>> > >>> >>> Let me know what else we can do to help. > >>> >>> > >>> >>> Thanks, > >>> >>> -----BEGIN PGP SIGNATURE----- > >>> >>> Version: Mailvelope v1.2.0 > >>> >>> Comment: https://www.mailvelope.com > >>> >>> > >>> >>> wsFcBAEBCAAQBQJWFFwACRDmVDuy+mK58QAAs/UP/1L+y7DEfHqD/5OpkiNQ > >>> >>> xuEEDm7fNJK58tLRmKsCrDrsFUvWCjiqUwboPg/E40e2GN7Lt+VkhMUEUWoo > >>> >>> e3L20ig04c8Zu6fE/SXX3lnvayxsWTPcMnYI+HsmIV9E/efDLVLEf6T4fvXg > >>> >>> 5dKLiqQ8Apu+UMVfd1+aKKDdLdnYlgBCZcIV9AQe1GB8X2VJJhmNWh6TQ3Xr > >>> >>> gNXDexBdYjFBLu84FXOITd3ZtyUkgx/exCUMmwsJSc90jduzipS5hArvf7LN > >>> >>> HD6m1gBkZNbfWfc/4nzqOQnKdY1pd9jyoiQM70jn0R5b2BlZT0wLjiAJm+07 > >>> >>> eCCQ99TZHFyeu1LyovakrYncXcnPtP5TfBFZW952FWQugupvxPCcaduz+GJV > >>> >>> OhPAJ9dv90qbbGCO+8kpTMAD1aHgt/7+0/hKZTg8WMHhua68SFCXmdGAmqje > >>> >>> IkIKswIAX4/uIoo5mK4TYB5HdEMJf9DzBFd+1RzzfRrrRalVkBfsu5ChFTx3 > >>> >>> mu5LAMwKTslvILMxAct0JwnwkOX5Gd+OFvmBRdm16UpDaDTQT2DfykylcmJd > >>> >>> Cf9rPZxUv0ZHtZyTTyP2e6vgrc7UM/Ie5KonABxQ11mGtT8ysra3c9kMhYpw > >>> >>> D6hcAZGtdvpiBRXBC5gORfiFWFxwu5kQ+daUhgUIe/O/EWyeD0rirZoqlLnZ > >>> >>> EDrG > >>> >>> =BZVw > >>> >>> -----END PGP SIGNATURE----- > >>> >>> ---------------- > >>> >>> Robert LeBlanc > >>> >>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>> > >>> >>> > >>> >>> On Tue, Oct 6, 2015 at 2:36 PM, Robert LeBlanc wrote: > >>> >>>> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>> Hash: SHA256 > >>> >>>> > >>> >>>> On my second test (a much longer one), it took nearly an hour, but a > >>> >>>> few messages have popped up over a 20 window. Still far less than I > >>> >>>> have been seeing. > >>> >>>> - ---------------- > >>> >>>> Robert LeBlanc > >>> >>>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>> > >>> >>>> > >>> >>>> On Tue, Oct 6, 2015 at 2:00 PM, Robert LeBlanc wrote: > >>> >>>>> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>> Hash: SHA256 > >>> >>>>> > >>> >>>>> I'll capture another set of logs. Is there any other debugging you > >>> >>>>> want turned up? I've seen the same thing where I see the message > >>> >>>>> dispatched to the secondary OSD, but the message just doesn't show up > >>> >>>>> for 30+ seconds in the secondary OSD logs. > >>> >>>>> - ---------------- > >>> >>>>> Robert LeBlanc > >>> >>>>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>> > >>> >>>>> > >>> >>>>> On Tue, Oct 6, 2015 at 1:34 PM, Sage Weil wrote: > >>> >>>>>> On Tue, 6 Oct 2015, Robert LeBlanc wrote: > >>> >>>>>>> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>>>> Hash: SHA256 > >>> >>>>>>> > >>> >>>>>>> I can't think of anything. In my dev cluster the only thing that has > >>> >>>>>>> changed is the Ceph versions (no reboot). What I like is even though > >>> >>>>>>> the disks are 100% utilized, it is preforming as I expect now. Client > >>> >>>>>>> I/O is slightly degraded during the recovery, but no blocked I/O when > >>> >>>>>>> the OSD boots or during the recovery period. This is with > >>> >>>>>>> max_backfills set to 20, one backfill max in our production cluster is > >>> >>>>>>> painful on OSD boot/recovery. I was able to reproduce this issue on > >>> >>>>>>> our dev cluster very easily and very quickly with these settings. So > >>> >>>>>>> far two tests and an hour later, only the blocked I/O when the OSD is > >>> >>>>>>> marked out. We would love to see that go away too, but this is far > >>> >>>>>> (me too!) > >>> >>>>>>> better than what we have now. This dev cluster also has > >>> >>>>>>> osd_client_message_cap set to default (100). > >>> >>>>>>> > >>> >>>>>>> We need to stay on the Hammer version of Ceph and I'm willing to take > >>> >>>>>>> the time to bisect this. If this is not a problem in Firefly/Giant, > >>> >>>>>>> you you prefer a bisect to find the introduction of the problem > >>> >>>>>>> (Firefly/Giant -> Hammer) or the introduction of the resolution > >>> >>>>>>> (Hammer -> Infernalis)? Do you have some hints to reduce hitting a > >>> >>>>>>> commit that prevents a clean build as that is my most limiting factor? > >>> >>>>>> > >>> >>>>>> Nothing comes to mind. I think the best way to find this is still to see > >>> >>>>>> it happen in the logs with hammer. The frustrating thing with that log > >>> >>>>>> dump you sent is that although I see plenty of slow request warnings in > >>> >>>>>> the osd logs, I don't see the requests arriving. Maybe the logs weren't > >>> >>>>>> turned up for long enough? > >>> >>>>>> > >>> >>>>>> sage > >>> >>>>>> > >>> >>>>>> > >>> >>>>>> > >>> >>>>>>> Thanks, > >>> >>>>>>> - ---------------- > >>> >>>>>>> Robert LeBlanc > >>> >>>>>>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>>>> > >>> >>>>>>> > >>> >>>>>>> On Tue, Oct 6, 2015 at 12:32 PM, Sage Weil wrote: > >>> >>>>>>> > On Tue, 6 Oct 2015, Robert LeBlanc wrote: > >>> >>>>>>> >> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>>>> >> Hash: SHA256 > >>> >>>>>>> >> > >>> >>>>>>> >> OK, an interesting point. Running ceph version 9.0.3-2036-g4f54a0d > >>> >>>>>>> >> (4f54a0dd7c4a5c8bdc788c8b7f58048b2a28b9be) looks a lot better. I got > >>> >>>>>>> >> messages when the OSD was marked out: > >>> >>>>>>> >> > >>> >>>>>>> >> 2015-10-06 11:52:46.961040 osd.13 192.168.55.12:6800/20870 81 : > >>> >>>>>>> >> cluster [WRN] 17 slow requests, 3 included below; oldest blocked for > > >>> >>>>>>> >> 34.476006 secs > >>> >>>>>>> >> 2015-10-06 11:52:46.961056 osd.13 192.168.55.12:6800/20870 82 : > >>> >>>>>>> >> cluster [WRN] slow request 32.913474 seconds old, received at > >>> >>>>>>> >> 2015-10-06 11:52:14.047475: osd_op(client.600962.0:474 > >>> >>>>>>> >> rbd_data.338102ae8944a.0000000000005270 [read 3302912~4096] 8.c74a4538 > >>> >>>>>>> >> ack+read+known_if_redirected e58744) currently waiting for peered > >>> >>>>>>> >> 2015-10-06 11:52:46.961066 osd.13 192.168.55.12:6800/20870 83 : > >>> >>>>>>> >> cluster [WRN] slow request 32.697545 seconds old, received at > >>> >>>>>>> >> 2015-10-06 11:52:14.263403: osd_op(client.600960.0:583 > >>> >>>>>>> >> rbd_data.3380f74b0dc51.000000000001ee75 [read 1016832~4096] 8.778d1be3 > >>> >>>>>>> >> ack+read+known_if_redirected e58744) currently waiting for peered > >>> >>>>>>> >> 2015-10-06 11:52:46.961074 osd.13 192.168.55.12:6800/20870 84 : > >>> >>>>>>> >> cluster [WRN] slow request 32.668006 seconds old, received at > >>> >>>>>>> >> 2015-10-06 11:52:14.292942: osd_op(client.600955.0:571 > >>> >>>>>>> >> rbd_data.3380f74b0dc51.0000000000019b09 [read 1034240~4096] 8.e87a6f58 > >>> >>>>>>> >> ack+read+known_if_redirected e58744) currently waiting for peered > >>> >>>>>>> >> > >>> >>>>>>> >> But I'm not seeing the blocked messages when the OSD came back in. The > >>> >>>>>>> >> OSD spindles have been running at 100% during this test. I have seen > >>> >>>>>>> >> slowed I/O from the clients as expected from the extra load, but so > >>> >>>>>>> >> far no blocked messages. I'm going to run some more tests. > >>> >>>>>>> > > >>> >>>>>>> > Good to hear. > >>> >>>>>>> > > >>> >>>>>>> > FWIW I looked through the logs and all of the slow request no flag point > >>> >>>>>>> > messages came from osd.163... and the logs don't show when they arrived. > >>> >>>>>>> > My guess is this OSD has a slower disk than the others, or something else > >>> >>>>>>> > funny is going on? > >>> >>>>>>> > > >>> >>>>>>> > I spot checked another OSD at random (60) where I saw a slow request. It > >>> >>>>>>> > was stuck peering for 10s of seconds... waiting on a pg log message from > >>> >>>>>>> > osd.163. > >>> >>>>>>> > > >>> >>>>>>> > sage > >>> >>>>>>> > > >>> >>>>>>> > > >>> >>>>>>> >> > >>> >>>>>>> >> -----BEGIN PGP SIGNATURE----- > >>> >>>>>>> >> Version: Mailvelope v1.2.0 > >>> >>>>>>> >> Comment: https://www.mailvelope.com > >>> >>>>>>> >> > >>> >>>>>>> >> wsFcBAEBCAAQBQJWFAzRCRDmVDuy+mK58QAASRYP/jrbKy5mptq/cSqJvB47 > >>> >>>>>>> >> F/gEatsqU4/TwyIJg137DQTkONbHKnLgCZqsJLnCZRH8fFqtvY6g/Q/AA7Ks > >>> >>>>>>> >> ouo5gvbjKM7pOm/uUn8kU44Xe15f/bkVHvWBECZzg8YJwinPAisp5R0m1HBC > >>> >>>>>>> >> HLvsbeqV00m72TyfsZX4aj7lHdyvcdcIH2EVgX/db092VVXczK4q2gRoNr0Y > >>> >>>>>>> >> 77BEr2Y/gPj5LM4b/aDG5AWY8dJZRlNz+B1CyLS+kIDXSaAbzul2UbAG6jNE > >>> >>>>>>> >> KJEVxndMPfHLIdwg55+q8VTMIjqXcCM47cQhWFrKChgVD8byJxpc6E0TqOxs > >>> >>>>>>> >> 1gtNE8AILoCSYKnwQZan+TBDGxki7rQxzMdNI+NLfhy1Mwd3lSCPsDtD7W/i > >>> >>>>>>> >> tzNTr6aGz+wr+OPDQV5zrzLaPZYF3FLWN4n6RYNfnDramYzD76v+7kjdW4dE > >>> >>>>>>> >> 5UVCtE7KGLCZ21fu6sln1b9q6lYXNtohAmAunIdqpo3FmHusRySyZzYKu1+9 > >>> >>>>>>> >> zg/LHiArD/ddjkPxVWCTFBS17g/bESRcv2MsA30GS8J6k1zlQaLX5KeGg6Ql > >>> >>>>>>> >> WJSmW8gFfEbXj/7JTrVtQWTdgjsegaySFnDisTWUR/hEM/NuKii4xfjI32M/ > >>> >>>>>>> >> luUMXHZ8lTHk9C8MfZcpyPGvwp2FliD9LqaWOVPWtWZJcerEWcZVlEApg4qb > >>> >>>>>>> >> fo5a > >>> >>>>>>> >> =ahEi > >>> >>>>>>> >> -----END PGP SIGNATURE----- > >>> >>>>>>> >> ---------------- > >>> >>>>>>> >> Robert LeBlanc > >>> >>>>>>> >> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>>>> >> > >>> >>>>>>> >> > >>> >>>>>>> >> On Tue, Oct 6, 2015 at 6:37 AM, Sage Weil wrote: > >>> >>>>>>> >> > On Mon, 5 Oct 2015, Robert LeBlanc wrote: > >>> >>>>>>> >> >> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>>>> >> >> Hash: SHA256 > >>> >>>>>>> >> >> > >>> >>>>>>> >> >> With some off-list help, we have adjusted > >>> >>>>>>> >> >> osd_client_message_cap=10000. This seems to have helped a bit and we > >>> >>>>>>> >> >> have seen some OSDs have a value up to 4,000 for client messages. But > >>> >>>>>>> >> >> it does not solve the problem with the blocked I/O. > >>> >>>>>>> >> >> > >>> >>>>>>> >> >> One thing that I have noticed is that almost exactly 30 seconds elapse > >>> >>>>>>> >> >> between an OSD boots and the first blocked I/O message. I don't know > >>> >>>>>>> >> >> if the OSD doesn't have time to get it's brain right about a PG before > >>> >>>>>>> >> >> it starts servicing it or what exactly. > >>> >>>>>>> >> > > >>> >>>>>>> >> > I'm downloading the logs from yesterday now; sorry it's taking so long. > >>> >>>>>>> >> > > >>> >>>>>>> >> >> On another note, I tried upgrading our CentOS dev cluster from Hammer > >>> >>>>>>> >> >> to master and things didn't go so well. The OSDs would not start > >>> >>>>>>> >> >> because /var/lib/ceph was not owned by ceph. I chowned the directory > >>> >>>>>>> >> >> and all OSDs and the OSD then started, but never became active in the > >>> >>>>>>> >> >> cluster. It just sat there after reading all the PGs. There were > >>> >>>>>>> >> >> sockets open to the monitor, but no OSD to OSD sockets. I tried > >>> >>>>>>> >> >> downgrading to the Infernalis branch and still no luck getting the > >>> >>>>>>> >> >> OSDs to come up. The OSD processes were idle after the initial boot. > >>> >>>>>>> >> >> All packages were installed from gitbuilder. > >>> >>>>>>> >> > > >>> >>>>>>> >> > Did you chown -R ? > >>> >>>>>>> >> > > >>> >>>>>>> >> > https://github.com/ceph/ceph/blob/infernalis/doc/release-notes.rst#upgrading-from-hammer > >>> >>>>>>> >> > > >>> >>>>>>> >> > My guess is you only chowned the root dir, and the OSD didn't throw > >>> >>>>>>> >> > an error when it encountered the other files? If you can generate a debug > >>> >>>>>>> >> > osd = 20 log, that would be helpful.. thanks! > >>> >>>>>>> >> > > >>> >>>>>>> >> > sage > >>> >>>>>>> >> > > >>> >>>>>>> >> > > >>> >>>>>>> >> >> > >>> >>>>>>> >> >> Thanks, > >>> >>>>>>> >> >> -----BEGIN PGP SIGNATURE----- > >>> >>>>>>> >> >> Version: Mailvelope v1.2.0 > >>> >>>>>>> >> >> Comment: https://www.mailvelope.com > >>> >>>>>>> >> >> > >>> >>>>>>> >> >> wsFcBAEBCAAQBQJWE0F5CRDmVDuy+mK58QAAaCYQAJuFcCvRUJ46k0rYrMcc > >>> >>>>>>> >> >> YlrSrGwS57GJS/JjaFHsvBV7KTobEMNeMkSv4PTGpwylNV9Dx4Ad74DDqX4g > >>> >>>>>>> >> >> 6hZDe0rE+uEI7tW9Lqp+MN7eaU2lDuwLt/pOzZI14jTskUYTlNi3HjlN67mQ > >>> >>>>>>> >> >> aiX1rbrJL6FFkuMOn/YqHpMbxI5ZOUZc1s7RDhASOPIs4z/CxpDfluW6fZA/ > >>> >>>>>>> >> >> y8C+pW6zzS9U/6jZwtGhBq4dvDBO41Lxb9WOehD8Aa/Qt6XNDzGw2KEkEkw7 > >>> >>>>>>> >> >> 8dBc7UFa2Wx3Tnzy238a/nKhtz6O6OrHsroA+HGWwCoxPWjOsz/xOoOmfwp+ > >>> >>>>>>> >> >> ALkY3id+t2uJEqzbL8/MgJ2RV1A+AZ7W1VWIJUOkDz0wR+KxQsxduHoD6rQy > >>> >>>>>>> >> >> zg0fj2KSAlmVusYOPM1s1+jBsqNF3wcNxpbRoVuFqk0xMgGPrIdUNdZHg6bs > >>> >>>>>>> >> >> D5sfkjNKexFe0ifFJ0cfv6UaGIKv4dK2eq3jUKgXHfh/qZmJbEB+zHaqJNyg > >>> >>>>>>> >> >> CN6w6xu1FHLeVobKAWe5ZzKY5lxw6b8YG+ce/E2dvW73gSASPTvtv68gaT04 > >>> >>>>>>> >> >> 2SPF9Ql0fERL5EDY9Pc4MHpQVcS0XxxJA69CgnWgaG6fzq2eY7fALeMBVWlB > >>> >>>>>>> >> >> fRj3zQwqJls/X8JZ3c4P4G0R6DP9bmMwGr++oYc3gWGrvgzxw3N7+ornd0jd > >>> >>>>>>> >> >> GdXC > >>> >>>>>>> >> >> =Aigq > >>> >>>>>>> >> >> -----END PGP SIGNATURE----- > >>> >>>>>>> >> >> ---------------- > >>> >>>>>>> >> >> Robert LeBlanc > >>> >>>>>>> >> >> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>>>> >> >> > >>> >>>>>>> >> >> > >>> >>>>>>> >> >> On Sun, Oct 4, 2015 at 3:04 PM, Robert LeBlanc wrote: > >>> >>>>>>> >> >> > -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>>>> >> >> > Hash: SHA256 > >>> >>>>>>> >> >> > > >>> >>>>>>> >> >> > I have eight nodes running the fio job rbd_test_real to different RBD > >>> >>>>>>> >> >> > volumes. I've included the CRUSH map in the tarball. > >>> >>>>>>> >> >> > > >>> >>>>>>> >> >> > I stopped one OSD process and marked it out. I let it recover for a > >>> >>>>>>> >> >> > few minutes and then I started the process again and marked it in. I > >>> >>>>>>> >> >> > started getting block I/O messages during the recovery. > >>> >>>>>>> >> >> > > >>> >>>>>>> >> >> > The logs are located at http://162.144.87.113/files/ushou1.tar.xz > >>> >>>>>>> >> >> > > >>> >>>>>>> >> >> > Thanks, > >>> >>>>>>> >> >> > -----BEGIN PGP SIGNATURE----- > >>> >>>>>>> >> >> > Version: Mailvelope v1.2.0 > >>> >>>>>>> >> >> > Comment: https://www.mailvelope.com > >>> >>>>>>> >> >> > > >>> >>>>>>> >> >> > wsFcBAEBCAAQBQJWEZRcCRDmVDuy+mK58QAALbEQAK5pFiixJarUdLm50zp/ > >>> >>>>>>> >> >> > 3AGgGBPrieExKmoZZLCoMGfOLfxZDbN2ybtopKDQDfrTqndE/6Xi9UXqTOdW > >>> >>>>>>> >> >> > jDc9U1wusgG0CKPsY1SMYnB9akvaDwtdh5q5k4VpN2zsG9R6lRojHeNQR3Nf > >>> >>>>>>> >> >> > 56QevJL4/e5lC3sLhVnxXXi2XKnHCVOHT+PYgNour2ZWt6OTLoFFxuSU3zLN > >>> >>>>>>> >> >> > OtfXgrFiiNF0mrDpm0gg2l8a8N5SwP9mM233S2U/JiGAqsqoqkfd0okjDenC > >>> >>>>>>> >> >> > ksesU/n7zordFpfLN3yjL6+X9pQ4YA6otZrq4wWtjWKO/H0b+6iIsf/AE131 > >>> >>>>>>> >> >> > R6a4Vufndpd3Ce+FNfM+iu3FmKk0KVfDAaF/tIP6S6XUzGVMAbpvpmqNL17o > >>> >>>>>>> >> >> > boh3wPZEyK+7KiF4Qlt2KoI/FV24Yj8XiyMnKin3MbMYbammb4ER977VH7iI > >>> >>>>>>> >> >> > sZyelNPSsYmmw/MF+AkA5KVgzQ4DAPflaejIgC5uw3dYKrn2AQE5CE9nN8Gz > >>> >>>>>>> >> >> > GVVaGItu1Bvrz21QoT9o5v0dZ85zttFvtrKIYgSi4mdpC6XkzUbg9s9EB1/T > >>> >>>>>>> >> >> > SEY+fau7W7TtiLpzCAIQ3zDvgsvkx2P6tKg5U8e93LVv9B+YI8i8mUxxv1j5 > >>> >>>>>>> >> >> > PHFi7KTgRUPm1FPMJDSyzvOgqyMj9AzaESl1Na6k529ILFIcyfko0niTT1oZ > >>> >>>>>>> >> >> > 3EPx > >>> >>>>>>> >> >> > =UDIV > >>> >>>>>>> >> >> > -----END PGP SIGNATURE----- > >>> >>>>>>> >> >> > > >>> >>>>>>> >> >> > ---------------- > >>> >>>>>>> >> >> > Robert LeBlanc > >>> >>>>>>> >> >> > PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>>>> >> >> > > >>> >>>>>>> >> >> > > >>> >>>>>>> >> >> > On Sun, Oct 4, 2015 at 7:48 AM, Sage Weil wrote: > >>> >>>>>>> >> >> >> On Sat, 3 Oct 2015, Robert LeBlanc wrote: > >>> >>>>>>> >> >> >>> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>>>> >> >> >>> Hash: SHA256 > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> We are still struggling with this and have tried a lot of different > >>> >>>>>>> >> >> >>> things. Unfortunately, Inktank (now Red Hat) no longer provides > >>> >>>>>>> >> >> >>> consulting services for non-Red Hat systems. If there are some > >>> >>>>>>> >> >> >>> certified Ceph consultants in the US that we can do both remote and > >>> >>>>>>> >> >> >>> on-site engagements, please let us know. > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> This certainly seems to be network related, but somewhere in the > >>> >>>>>>> >> >> >>> kernel. We have tried increasing the network and TCP buffers, number > >>> >>>>>>> >> >> >>> of TCP sockets, reduced the FIN_WAIT2 state. There is about 25% idle > >>> >>>>>>> >> >> >>> on the boxes, the disks are busy, but not constantly at 100% (they > >>> >>>>>>> >> >> >>> cycle from <10% up to 100%, but not 100% for more than a few seconds > >>> >>>>>>> >> >> >>> at a time). There seems to be no reasonable explanation why I/O is > >>> >>>>>>> >> >> >>> blocked pretty frequently longer than 30 seconds. We have verified > >>> >>>>>>> >> >> >>> Jumbo frames by pinging from/to each node with 9000 byte packets. The > >>> >>>>>>> >> >> >>> network admins have verified that packets are not being dropped in the > >>> >>>>>>> >> >> >>> switches for these nodes. We have tried different kernels including > >>> >>>>>>> >> >> >>> the recent Google patch to cubic. This is showing up on three cluster > >>> >>>>>>> >> >> >>> (two Ethernet and one IPoIB). I booted one cluster into Debian Jessie > >>> >>>>>>> >> >> >>> (from CentOS 7.1) with similar results. > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> The messages seem slightly different: > >>> >>>>>>> >> >> >>> 2015-10-03 14:38:23.193082 osd.134 10.208.16.25:6800/1425 439 : > >>> >>>>>>> >> >> >>> cluster [WRN] 14 slow requests, 1 included below; oldest blocked for > > >>> >>>>>>> >> >> >>> 100.087155 secs > >>> >>>>>>> >> >> >>> 2015-10-03 14:38:23.193090 osd.134 10.208.16.25:6800/1425 440 : > >>> >>>>>>> >> >> >>> cluster [WRN] slow request 30.041999 seconds old, received at > >>> >>>>>>> >> >> >>> 2015-10-03 14:37:53.151014: osd_op(client.1328605.0:7082862 > >>> >>>>>>> >> >> >>> rbd_data.13fdcb2ae8944a.000000000001264f [read 975360~4096] > >>> >>>>>>> >> >> >>> 11.6d19c36f ack+read+known_if_redirected e10249) currently no flag > >>> >>>>>>> >> >> >>> points reached > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> I don't know what "no flag points reached" means. > >>> >>>>>>> >> >> >> > >>> >>>>>>> >> >> >> Just that the op hasn't been marked as reaching any interesting points > >>> >>>>>>> >> >> >> (op->mark_*() calls). > >>> >>>>>>> >> >> >> > >>> >>>>>>> >> >> >> Is it possible to gather a lot with debug ms = 20 and debug osd = 20? > >>> >>>>>>> >> >> >> It's extremely verbose but it'll let us see where the op is getting > >>> >>>>>>> >> >> >> blocked. If you see the "slow request" message it means the op in > >>> >>>>>>> >> >> >> received by ceph (that's when the clock starts), so I suspect it's not > >>> >>>>>>> >> >> >> something we can blame on the network stack. > >>> >>>>>>> >> >> >> > >>> >>>>>>> >> >> >> sage > >>> >>>>>>> >> >> >> > >>> >>>>>>> >> >> >> > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> The problem is most pronounced when we have to reboot an OSD node (1 > >>> >>>>>>> >> >> >>> of 13), we will have hundreds of I/O blocked for some times up to 300 > >>> >>>>>>> >> >> >>> seconds. It takes a good 15 minutes for things to settle down. The > >>> >>>>>>> >> >> >>> production cluster is very busy doing normally 8,000 I/O and peaking > >>> >>>>>>> >> >> >>> at 15,000. This is all 4TB spindles with SSD journals and the disks > >>> >>>>>>> >> >> >>> are between 25-50% full. We are currently splitting PGs to distribute > >>> >>>>>>> >> >> >>> the load better across the disks, but we are having to do this 10 PGs > >>> >>>>>>> >> >> >>> at a time as we get blocked I/O. We have max_backfills and > >>> >>>>>>> >> >> >>> max_recovery set to 1, client op priority is set higher than recovery > >>> >>>>>>> >> >> >>> priority. We tried increasing the number of op threads but this didn't > >>> >>>>>>> >> >> >>> seem to help. It seems as soon as PGs are finished being checked, they > >>> >>>>>>> >> >> >>> become active and could be the cause for slow I/O while the other PGs > >>> >>>>>>> >> >> >>> are being checked. > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> What I don't understand is that the messages are delayed. As soon as > >>> >>>>>>> >> >> >>> the message is received by Ceph OSD process, it is very quickly > >>> >>>>>>> >> >> >>> committed to the journal and a response is sent back to the primary > >>> >>>>>>> >> >> >>> OSD which is received very quickly as well. I've adjust > >>> >>>>>>> >> >> >>> min_free_kbytes and it seems to keep the OSDs from crashing, but > >>> >>>>>>> >> >> >>> doesn't solve the main problem. We don't have swap and there is 64 GB > >>> >>>>>>> >> >> >>> of RAM per nodes for 10 OSDs. > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> Is there something that could cause the kernel to get a packet but not > >>> >>>>>>> >> >> >>> be able to dispatch it to Ceph such that it could be explaining why we > >>> >>>>>>> >> >> >>> are seeing these blocked I/O for 30+ seconds. Is there some pointers > >>> >>>>>>> >> >> >>> to tracing Ceph messages from the network buffer through the kernel to > >>> >>>>>>> >> >> >>> the Ceph process? > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> We can really use some pointers no matter how outrageous. We've have > >>> >>>>>>> >> >> >>> over 6 people looking into this for weeks now and just can't think of > >>> >>>>>>> >> >> >>> anything else. > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> Thanks, > >>> >>>>>>> >> >> >>> -----BEGIN PGP SIGNATURE----- > >>> >>>>>>> >> >> >>> Version: Mailvelope v1.1.0 > >>> >>>>>>> >> >> >>> Comment: https://www.mailvelope.com > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> wsFcBAEBCAAQBQJWEDY1CRDmVDuy+mK58QAARgoP/RcoL1qVmg7qbQrzStar > >>> >>>>>>> >> >> >>> NK80bqYGeYHb26xHbt1fZVgnZhXU0nN0Dv4ew0e/cYJLELSO2KCeXNfXN6F1 > >>> >>>>>>> >> >> >>> prZuzYagYEyj1Q1TOo+4h/nOQRYsTwQDdFzbHb/OUDN55C0QGZ29DjEvrqP6 > >>> >>>>>>> >> >> >>> K5l6sAQzvQDpUEEIiOCkS6pH59ira740nSmnYkEWhr1lxF/hMjb6fFlfCFe2 > >>> >>>>>>> >> >> >>> h1djM0GfY7vBHFGgI3jkw0BL5AQnWe+SCcCiKZmxY6xiR70FWl3XqK5M+nxm > >>> >>>>>>> >> >> >>> iq74y7Dv6cpenit6boMr6qtOeIt+8ko85hVMh09Hkaqz/m2FzxAKLcahzkGF > >>> >>>>>>> >> >> >>> Fh/M6YBzgnX7QBURTC4YQT/FVyDTW3JMuT3RKQdaX6c0iiOsVdkE+iyidWyY > >>> >>>>>>> >> >> >>> Hr1KzWU23Ur9yBfZ39Y43jrsSiAEwHnKjSqMowSGljdTysNEAAZQhlqZIoHb > >>> >>>>>>> >> >> >>> JlgpB39ugkHI1H5fZ5b2SIDz32/d5ywG4Gay9Rk6hp8VanvIrBbev+JYEoYT > >>> >>>>>>> >> >> >>> 8/WX+fhueHt4dqUYWIl3HZ0CEzbXbug0xmFvhrbmL2f3t9XOkDZRbAjlYrGm > >>> >>>>>>> >> >> >>> lswiJMDueY8JkxSnPvCQrHXqjbCcy9rMG7nTnLFz98rTcHNCwtpv0qVYhheg > >>> >>>>>>> >> >> >>> 4YRNRVMbfNP/6xsJvG1wVOSQPwxZSPqJh42pDqMRePJl3Zn66MTx5wvdNDpk > >>> >>>>>>> >> >> >>> l7OF > >>> >>>>>>> >> >> >>> =OI++ > >>> >>>>>>> >> >> >>> -----END PGP SIGNATURE----- > >>> >>>>>>> >> >> >>> ---------------- > >>> >>>>>>> >> >> >>> Robert LeBlanc > >>> >>>>>>> >> >> >>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> On Fri, Sep 25, 2015 at 2:40 PM, Robert LeBlanc wrote: > >>> >>>>>>> >> >> >>> > We dropped the replication on our cluster from 4 to 3 and it looks > >>> >>>>>>> >> >> >>> > like all the blocked I/O has stopped (no entries in the log for the > >>> >>>>>>> >> >> >>> > last 12 hours). This makes me believe that there is some issue with > >>> >>>>>>> >> >> >>> > the number of sockets or some other TCP issue. We have not messed with > >>> >>>>>>> >> >> >>> > Ephemeral ports and TIME_WAIT at this point. There are 130 OSDs, 8 KVM > >>> >>>>>>> >> >> >>> > hosts hosting about 150 VMs. Open files is set at 32K for the OSD > >>> >>>>>>> >> >> >>> > processes and 16K system wide. > >>> >>>>>>> >> >> >>> > > >>> >>>>>>> >> >> >>> > Does this seem like the right spot to be looking? What are some > >>> >>>>>>> >> >> >>> > configuration items we should be looking at? > >>> >>>>>>> >> >> >>> > > >>> >>>>>>> >> >> >>> > Thanks, > >>> >>>>>>> >> >> >>> > ---------------- > >>> >>>>>>> >> >> >>> > Robert LeBlanc > >>> >>>>>>> >> >> >>> > PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>>>> >> >> >>> > > >>> >>>>>>> >> >> >>> > > >>> >>>>>>> >> >> >>> > On Wed, Sep 23, 2015 at 1:30 PM, Robert LeBlanc wrote: > >>> >>>>>>> >> >> >>> >> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>>>> >> >> >>> >> Hash: SHA256 > >>> >>>>>>> >> >> >>> >> > >>> >>>>>>> >> >> >>> >> We were able to only get ~17Gb out of the XL710 (heavily tweaked) > >>> >>>>>>> >> >> >>> >> until we went to the 4.x kernel where we got ~36Gb (no tweaking). It > >>> >>>>>>> >> >> >>> >> seems that there were some major reworks in the network handling in > >>> >>>>>>> >> >> >>> >> the kernel to efficiently handle that network rate. If I remember > >>> >>>>>>> >> >> >>> >> right we also saw a drop in CPU utilization. I'm starting to think > >>> >>>>>>> >> >> >>> >> that we did see packet loss while congesting our ISLs in our initial > >>> >>>>>>> >> >> >>> >> testing, but we could not tell where the dropping was happening. We > >>> >>>>>>> >> >> >>> >> saw some on the switches, but it didn't seem to be bad if we weren't > >>> >>>>>>> >> >> >>> >> trying to congest things. We probably already saw this issue, just > >>> >>>>>>> >> >> >>> >> didn't know it. > >>> >>>>>>> >> >> >>> >> - ---------------- > >>> >>>>>>> >> >> >>> >> Robert LeBlanc > >>> >>>>>>> >> >> >>> >> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>>>> >> >> >>> >> > >>> >>>>>>> >> >> >>> >> > >>> >>>>>>> >> >> >>> >> On Wed, Sep 23, 2015 at 1:10 PM, Mark Nelson wrote: > >>> >>>>>>> >> >> >>> >>> FWIW, we've got some 40GbE Intel cards in the community performance cluster > >>> >>>>>>> >> >> >>> >>> on a Mellanox 40GbE switch that appear (knock on wood) to be running fine > >>> >>>>>>> >> >> >>> >>> with 3.10.0-229.7.2.el7.x86_64. We did get feedback from Intel that older > >>> >>>>>>> >> >> >>> >>> drivers might cause problems though. > >>> >>>>>>> >> >> >>> >>> > >>> >>>>>>> >> >> >>> >>> Here's ifconfig from one of the nodes: > >>> >>>>>>> >> >> >>> >>> > >>> >>>>>>> >> >> >>> >>> ens513f1: flags=4163 mtu 1500 > >>> >>>>>>> >> >> >>> >>> inet 10.0.10.101 netmask 255.255.255.0 broadcast 10.0.10.255 > >>> >>>>>>> >> >> >>> >>> inet6 fe80::6a05:caff:fe2b:7ea1 prefixlen 64 scopeid 0x20 > >>> >>>>>>> >> >> >>> >>> ether 68:05:ca:2b:7e:a1 txqueuelen 1000 (Ethernet) > >>> >>>>>>> >> >> >>> >>> RX packets 169232242875 bytes 229346261232279 (208.5 TiB) > >>> >>>>>>> >> >> >>> >>> RX errors 0 dropped 0 overruns 0 frame 0 > >>> >>>>>>> >> >> >>> >>> TX packets 153491686361 bytes 203976410836881 (185.5 TiB) > >>> >>>>>>> >> >> >>> >>> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 > >>> >>>>>>> >> >> >>> >>> > >>> >>>>>>> >> >> >>> >>> Mark > >>> >>>>>>> >> >> >>> >>> > >>> >>>>>>> >> >> >>> >>> > >>> >>>>>>> >> >> >>> >>> On 09/23/2015 01:48 PM, Robert LeBlanc wrote: > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>>> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>>>> >> >> >>> >>>> Hash: SHA256 > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>>> OK, here is the update on the saga... > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>>> I traced some more of blocked I/Os and it seems that communication > >>> >>>>>>> >> >> >>> >>>> between two hosts seemed worse than others. I did a two way ping flood > >>> >>>>>>> >> >> >>> >>>> between the two hosts using max packet sizes (1500). After 1.5M > >>> >>>>>>> >> >> >>> >>>> packets, no lost pings. Then then had the ping flood running while I > >>> >>>>>>> >> >> >>> >>>> put Ceph load on the cluster and the dropped pings started increasing > >>> >>>>>>> >> >> >>> >>>> after stopping the Ceph workload the pings stopped dropping. > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>>> I then ran iperf between all the nodes with the same results, so that > >>> >>>>>>> >> >> >>> >>>> ruled out Ceph to a large degree. I then booted in the the > >>> >>>>>>> >> >> >>> >>>> 3.10.0-229.14.1.el7.x86_64 kernel and with an hour test so far there > >>> >>>>>>> >> >> >>> >>>> hasn't been any dropped pings or blocked I/O. Our 40 Gb NICs really > >>> >>>>>>> >> >> >>> >>>> need the network enhancements in the 4.x series to work well. > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>>> Does this sound familiar to anyone? I'll probably start bisecting the > >>> >>>>>>> >> >> >>> >>>> kernel to see where this issue in introduced. Both of the clusters > >>> >>>>>>> >> >> >>> >>>> with this issue are running 4.x, other than that, they are pretty > >>> >>>>>>> >> >> >>> >>>> differing hardware and network configs. > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>>> Thanks, > >>> >>>>>>> >> >> >>> >>>> -----BEGIN PGP SIGNATURE----- > >>> >>>>>>> >> >> >>> >>>> Version: Mailvelope v1.1.0 > >>> >>>>>>> >> >> >>> >>>> Comment: https://www.mailvelope.com > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>>> wsFcBAEBCAAQBQJWAvOzCRDmVDuy+mK58QAApOMP/1xmCtW++G11qcE8y/sr > >>> >>>>>>> >> >> >>> >>>> RkXguqZJLc4czdOwV/tjUvhVsm5qOl4wvQCtABFZpc6t4+m5nzE3LkA1rl2l > >>> >>>>>>> >> >> >>> >>>> AnARPOjh61TO6cV0CT8O0DlqtHmSd2y0ElgAUl0594eInEn7eI7crz8R543V > >>> >>>>>>> >> >> >>> >>>> 7I68XU5zL/vNJ9IIx38UqdhtSzXQQL664DGq3DLINK0Yb9XRVBlFip+Slt+j > >>> >>>>>>> >> >> >>> >>>> cB64TuWjOPLSH09pv7SUyksodqrTq3K7p6sQkq0MOzBkFQM1FHfOipbo/LYv > >>> >>>>>>> >> >> >>> >>>> F42iiQbCvFizArMu20WeOSQ4dmrXT/iecgTfEag/Zxvor2gOi/J6d2XS9ckW > >>> >>>>>>> >> >> >>> >>>> byEC5/rbm4yDBua2ZugeNxQLWq0Oa7spZnx7usLsu/6YzeDNI6kmtGURajdE > >>> >>>>>>> >> >> >>> >>>> /XC8bESWKveBzmGDzjff5oaMs9A1PZURYnlYADEODGAt6byoaoQEGN6dlFGe > >>> >>>>>>> >> >> >>> >>>> LwQ5nOdQYuUrWpJzTJBN3aduOxursoFY8S0eR0uXm0l1CHcp22RWBDvRinok > >>> >>>>>>> >> >> >>> >>>> UWk5xRBgjDCD2gIwc+wpImZbCtiTdf0vad1uLvdxGL29iFta4THzJgUGrp98 > >>> >>>>>>> >> >> >>> >>>> sUqM3RaTRdJYjFcNP293H7/DC0mqpnmo0Clx3jkdHX+x1EXpJUtocSeI44LX > >>> >>>>>>> >> >> >>> >>>> KWIMhe9wXtKAoHQFEcJ0o0+wrXWMevvx33HPC4q1ULrFX0ILNx5Mo0Rp944X > >>> >>>>>>> >> >> >>> >>>> 4OEo > >>> >>>>>>> >> >> >>> >>>> =P33I > >>> >>>>>>> >> >> >>> >>>> -----END PGP SIGNATURE----- > >>> >>>>>>> >> >> >>> >>>> ---------------- > >>> >>>>>>> >> >> >>> >>>> Robert LeBlanc > >>> >>>>>>> >> >> >>> >>>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>>> On Tue, Sep 22, 2015 at 4:15 PM, Robert LeBlanc > >>> >>>>>>> >> >> >>> >>>> wrote: > >>> >>>>>>> >> >> >>> >>>>> > >>> >>>>>>> >> >> >>> >>>>> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>>>> >> >> >>> >>>>> Hash: SHA256 > >>> >>>>>>> >> >> >>> >>>>> > >>> >>>>>>> >> >> >>> >>>>> This is IPoIB and we have the MTU set to 64K. There was some issues > >>> >>>>>>> >> >> >>> >>>>> pinging hosts with "No buffer space available" (hosts are currently > >>> >>>>>>> >> >> >>> >>>>> configured for 4GB to test SSD caching rather than page cache). I > >>> >>>>>>> >> >> >>> >>>>> found that MTU under 32K worked reliable for ping, but still had the > >>> >>>>>>> >> >> >>> >>>>> blocked I/O. > >>> >>>>>>> >> >> >>> >>>>> > >>> >>>>>>> >> >> >>> >>>>> I reduced the MTU to 1500 and checked pings (OK), but I'm still seeing > >>> >>>>>>> >> >> >>> >>>>> the blocked I/O. > >>> >>>>>>> >> >> >>> >>>>> - ---------------- > >>> >>>>>>> >> >> >>> >>>>> Robert LeBlanc > >>> >>>>>>> >> >> >>> >>>>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>>>> >> >> >>> >>>>> > >>> >>>>>>> >> >> >>> >>>>> > >>> >>>>>>> >> >> >>> >>>>> On Tue, Sep 22, 2015 at 3:52 PM, Sage Weil wrote: > >>> >>>>>>> >> >> >>> >>>>>> > >>> >>>>>>> >> >> >>> >>>>>> On Tue, 22 Sep 2015, Samuel Just wrote: > >>> >>>>>>> >> >> >>> >>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>> I looked at the logs, it looks like there was a 53 second delay > >>> >>>>>>> >> >> >>> >>>>>>> between when osd.17 started sending the osd_repop message and when > >>> >>>>>>> >> >> >>> >>>>>>> osd.13 started reading it, which is pretty weird. Sage, didn't we > >>> >>>>>>> >> >> >>> >>>>>>> once see a kernel issue which caused some messages to be mysteriously > >>> >>>>>>> >> >> >>> >>>>>>> delayed for many 10s of seconds? > >>> >>>>>>> >> >> >>> >>>>>> > >>> >>>>>>> >> >> >>> >>>>>> > >>> >>>>>>> >> >> >>> >>>>>> Every time we have seen this behavior and diagnosed it in the wild it > >>> >>>>>>> >> >> >>> >>>>>> has > >>> >>>>>>> >> >> >>> >>>>>> been a network misconfiguration. Usually related to jumbo frames. > >>> >>>>>>> >> >> >>> >>>>>> > >>> >>>>>>> >> >> >>> >>>>>> sage > >>> >>>>>>> >> >> >>> >>>>>> > >>> >>>>>>> >> >> >>> >>>>>> > >>> >>>>>>> >> >> >>> >>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>> What kernel are you running? > >>> >>>>>>> >> >> >>> >>>>>>> -Sam > >>> >>>>>>> >> >> >>> >>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>> On Tue, Sep 22, 2015 at 2:22 PM, Robert LeBlanc wrote: > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>>>> >> >> >>> >>>>>>>> Hash: SHA256 > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> OK, looping in ceph-devel to see if I can get some more eyes. I've > >>> >>>>>>> >> >> >>> >>>>>>>> extracted what I think are important entries from the logs for the > >>> >>>>>>> >> >> >>> >>>>>>>> first blocked request. NTP is running all the servers so the logs > >>> >>>>>>> >> >> >>> >>>>>>>> should be close in terms of time. Logs for 12:50 to 13:00 are > >>> >>>>>>> >> >> >>> >>>>>>>> available at http://162.144.87.113/files/ceph_block_io.logs.tar.xz > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:06.500374 - osd.17 gets I/O from client > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:06.557160 - osd.17 submits I/O to osd.13 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:06.557305 - osd.17 submits I/O to osd.16 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:06.573711 - osd.16 gets I/O from osd.17 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:06.595716 - osd.17 gets ondisk result=0 from osd.16 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:06.640631 - osd.16 reports to osd.17 ondisk result=0 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:36.926691 - osd.17 reports slow I/O > 30.439150 sec > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:59.790591 - osd.13 gets I/O from osd.17 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:59.812405 - osd.17 gets ondisk result=0 from osd.13 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:56:02.941602 - osd.13 reports to osd.17 ondisk result=0 > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> In the logs I can see that osd.17 dispatches the I/O to osd.13 and > >>> >>>>>>> >> >> >>> >>>>>>>> osd.16 almost silmutaniously. osd.16 seems to get the I/O right away, > >>> >>>>>>> >> >> >>> >>>>>>>> but for some reason osd.13 doesn't get the message until 53 seconds > >>> >>>>>>> >> >> >>> >>>>>>>> later. osd.17 seems happy to just wait and doesn't resend the data > >>> >>>>>>> >> >> >>> >>>>>>>> (well, I'm not 100% sure how to tell which entries are the actual data > >>> >>>>>>> >> >> >>> >>>>>>>> transfer). > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> It looks like osd.17 is receiving responses to start the communication > >>> >>>>>>> >> >> >>> >>>>>>>> with osd.13, but the op is not acknowledged until almost a minute > >>> >>>>>>> >> >> >>> >>>>>>>> later. To me it seems that the message is getting received but not > >>> >>>>>>> >> >> >>> >>>>>>>> passed to another thread right away or something. This test was done > >>> >>>>>>> >> >> >>> >>>>>>>> with an idle cluster, a single fio client (rbd engine) with a single > >>> >>>>>>> >> >> >>> >>>>>>>> thread. > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> The OSD servers are almost 100% idle during these blocked I/O > >>> >>>>>>> >> >> >>> >>>>>>>> requests. I think I'm at the end of my troubleshooting, so I can use > >>> >>>>>>> >> >> >>> >>>>>>>> some help. > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> Single Test started about > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:52:36 > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:36.926680 osd.17 192.168.55.14:6800/16726 56 : > >>> >>>>>>> >> >> >>> >>>>>>>> cluster [WRN] 1 slow requests, 1 included below; oldest blocked for > > >>> >>>>>>> >> >> >>> >>>>>>>> 30.439150 secs > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:36.926699 osd.17 192.168.55.14:6800/16726 57 : > >>> >>>>>>> >> >> >>> >>>>>>>> cluster [WRN] slow request 30.439150 seconds old, received at > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:06.487451: > >>> >>>>>>> >> >> >>> >>>>>>>> osd_op(client.250874.0:1388 rbd_data.3380e2ae8944a.0000000000000545 > >>> >>>>>>> >> >> >>> >>>>>>>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> >>>>>>> >> >> >>> >>>>>>>> 0~4194304] 8.bbf3e8ff ack+ondisk+write+known_if_redirected e56785) > >>> >>>>>>> >> >> >>> >>>>>>>> currently waiting for subops from 13,16 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:36.697904 osd.16 192.168.55.13:6800/29410 7 : cluster > >>> >>>>>>> >> >> >>> >>>>>>>> [WRN] 2 slow requests, 2 included below; oldest blocked for > > >>> >>>>>>> >> >> >>> >>>>>>>> 30.379680 secs > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:36.697918 osd.16 192.168.55.13:6800/29410 8 : cluster > >>> >>>>>>> >> >> >>> >>>>>>>> [WRN] slow request 30.291520 seconds old, received at 2015-09-22 > >>> >>>>>>> >> >> >>> >>>>>>>> 12:55:06.406303: > >>> >>>>>>> >> >> >>> >>>>>>>> osd_op(client.250874.0:1384 rbd_data.3380e2ae8944a.0000000000000541 > >>> >>>>>>> >> >> >>> >>>>>>>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> >>>>>>> >> >> >>> >>>>>>>> 0~4194304] 8.5fb2123f ack+ondisk+write+known_if_redirected e56785) > >>> >>>>>>> >> >> >>> >>>>>>>> currently waiting for subops from 13,17 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:55:36.697927 osd.16 192.168.55.13:6800/29410 9 : cluster > >>> >>>>>>> >> >> >>> >>>>>>>> [WRN] slow request 30.379680 seconds old, received at 2015-09-22 > >>> >>>>>>> >> >> >>> >>>>>>>> 12:55:06.318144: > >>> >>>>>>> >> >> >>> >>>>>>>> osd_op(client.250874.0:1382 rbd_data.3380e2ae8944a.000000000000053f > >>> >>>>>>> >> >> >>> >>>>>>>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> >>>>>>> >> >> >>> >>>>>>>> 0~4194304] 8.312e69ca ack+ondisk+write+known_if_redirected e56785) > >>> >>>>>>> >> >> >>> >>>>>>>> currently waiting for subops from 13,14 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:58:03.998275 osd.13 192.168.55.12:6804/4574 130 : > >>> >>>>>>> >> >> >>> >>>>>>>> cluster [WRN] 1 slow requests, 1 included below; oldest blocked for > > >>> >>>>>>> >> >> >>> >>>>>>>> 30.954212 secs > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:58:03.998286 osd.13 192.168.55.12:6804/4574 131 : > >>> >>>>>>> >> >> >>> >>>>>>>> cluster [WRN] slow request 30.954212 seconds old, received at > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:57:33.044003: > >>> >>>>>>> >> >> >>> >>>>>>>> osd_op(client.250874.0:1873 rbd_data.3380e2ae8944a.000000000000070d > >>> >>>>>>> >> >> >>> >>>>>>>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> >>>>>>> >> >> >>> >>>>>>>> 0~4194304] 8.e69870d4 ack+ondisk+write+known_if_redirected e56785) > >>> >>>>>>> >> >> >>> >>>>>>>> currently waiting for subops from 16,17 > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:58:03.759826 osd.16 192.168.55.13:6800/29410 10 : > >>> >>>>>>> >> >> >>> >>>>>>>> cluster [WRN] 1 slow requests, 1 included below; oldest blocked for > > >>> >>>>>>> >> >> >>> >>>>>>>> 30.704367 secs > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:58:03.759840 osd.16 192.168.55.13:6800/29410 11 : > >>> >>>>>>> >> >> >>> >>>>>>>> cluster [WRN] slow request 30.704367 seconds old, received at > >>> >>>>>>> >> >> >>> >>>>>>>> 2015-09-22 12:57:33.055404: > >>> >>>>>>> >> >> >>> >>>>>>>> osd_op(client.250874.0:1874 rbd_data.3380e2ae8944a.000000000000070e > >>> >>>>>>> >> >> >>> >>>>>>>> [set-alloc-hint object_size 4194304 write_size 4194304,write > >>> >>>>>>> >> >> >>> >>>>>>>> 0~4194304] 8.f7635819 ack+ondisk+write+known_if_redirected e56785) > >>> >>>>>>> >> >> >>> >>>>>>>> currently waiting for subops from 13,17 > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> Server IP addr OSD > >>> >>>>>>> >> >> >>> >>>>>>>> nodev - 192.168.55.11 - 12 > >>> >>>>>>> >> >> >>> >>>>>>>> nodew - 192.168.55.12 - 13 > >>> >>>>>>> >> >> >>> >>>>>>>> nodex - 192.168.55.13 - 16 > >>> >>>>>>> >> >> >>> >>>>>>>> nodey - 192.168.55.14 - 17 > >>> >>>>>>> >> >> >>> >>>>>>>> nodez - 192.168.55.15 - 14 > >>> >>>>>>> >> >> >>> >>>>>>>> nodezz - 192.168.55.16 - 15 > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> fio job: > >>> >>>>>>> >> >> >>> >>>>>>>> [rbd-test] > >>> >>>>>>> >> >> >>> >>>>>>>> readwrite=write > >>> >>>>>>> >> >> >>> >>>>>>>> blocksize=4M > >>> >>>>>>> >> >> >>> >>>>>>>> #runtime=60 > >>> >>>>>>> >> >> >>> >>>>>>>> name=rbd-test > >>> >>>>>>> >> >> >>> >>>>>>>> #readwrite=randwrite > >>> >>>>>>> >> >> >>> >>>>>>>> #bssplit=4k/85:32k/11:512/3:1m/1,4k/89:32k/10:512k/1 > >>> >>>>>>> >> >> >>> >>>>>>>> #rwmixread=72 > >>> >>>>>>> >> >> >>> >>>>>>>> #norandommap > >>> >>>>>>> >> >> >>> >>>>>>>> #size=1T > >>> >>>>>>> >> >> >>> >>>>>>>> #blocksize=4k > >>> >>>>>>> >> >> >>> >>>>>>>> ioengine=rbd > >>> >>>>>>> >> >> >>> >>>>>>>> rbdname=test2 > >>> >>>>>>> >> >> >>> >>>>>>>> pool=rbd > >>> >>>>>>> >> >> >>> >>>>>>>> clientname=admin > >>> >>>>>>> >> >> >>> >>>>>>>> iodepth=8 > >>> >>>>>>> >> >> >>> >>>>>>>> #numjobs=4 > >>> >>>>>>> >> >> >>> >>>>>>>> #thread > >>> >>>>>>> >> >> >>> >>>>>>>> #group_reporting > >>> >>>>>>> >> >> >>> >>>>>>>> #time_based > >>> >>>>>>> >> >> >>> >>>>>>>> #direct=1 > >>> >>>>>>> >> >> >>> >>>>>>>> #ramp_time=60 > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> Thanks, > >>> >>>>>>> >> >> >>> >>>>>>>> -----BEGIN PGP SIGNATURE----- > >>> >>>>>>> >> >> >>> >>>>>>>> Version: Mailvelope v1.1.0 > >>> >>>>>>> >> >> >>> >>>>>>>> Comment: https://www.mailvelope.com > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> wsFcBAEBCAAQBQJWAcaKCRDmVDuy+mK58QAAPMsQAKBnS94fwuw0OqpPU3/z > >>> >>>>>>> >> >> >>> >>>>>>>> tL8Z6TVRxrNigf721+2ClIu4LIH71bupDc3DgrrysQmmqGuvEMn68spmasWu > >>> >>>>>>> >> >> >>> >>>>>>>> h9I/CqqgRpHqe4lUVoUEjyWA9/6Dbb6NiHSdpJ6p5jpGc8kZCvNS+ocDgFOl > >>> >>>>>>> >> >> >>> >>>>>>>> 903i0M0E9eEMeci5O/hrMrx1FG8SN2LS8nI261aNHMOwQK0bw8wWiCJEvqVB > >>> >>>>>>> >> >> >>> >>>>>>>> sz1/+jK1BJoeIYfaT9HfUXBAvfo/W3tY/vj9KbJuZJ5AMpeYPvEHu/LAr1N7 > >>> >>>>>>> >> >> >>> >>>>>>>> FzzUc7a6EMlaxmSd0ML49JbV0cY9BMDjfrkKEQNKlzszlEHm3iif98QtsxbF > >>> >>>>>>> >> >> >>> >>>>>>>> pPJ0hZ0G53BY3k976OWVMFm3WFRWUVOb/oiLF8H6PCm59b4LBNAg6iPNH1AI > >>> >>>>>>> >> >> >>> >>>>>>>> 5XhEcPpg06M03vqUaIiY9P1kQlvnn0yCXf82IUEgmg///vhxDsHWmcwClLEn > >>> >>>>>>> >> >> >>> >>>>>>>> B0VszouStTzlMYnc/2vlUiI4gFVeilWLMW00VGTWV+7V1oIzIYvWHyl2QpBq > >>> >>>>>>> >> >> >>> >>>>>>>> 4/ZwVjQ43qLfuDTS4o+IJ4ztOMd26vIv6Mn6WVwKCjoCXJc8ajywR9Dy+6lL > >>> >>>>>>> >> >> >>> >>>>>>>> o8oJ+tn7hMc9Qy1iBhu3/QIP4WCsUf9RVeu60oahNEpde89qW32S9CZlrJDO > >>> >>>>>>> >> >> >>> >>>>>>>> gf4iTryRjkAhdmZIj9JiaE8jQ6dvN817D9cqs/CXKV9vhzYoM7p5YWHghBKB > >>> >>>>>>> >> >> >>> >>>>>>>> J3hS > >>> >>>>>>> >> >> >>> >>>>>>>> =0J7F > >>> >>>>>>> >> >> >>> >>>>>>>> -----END PGP SIGNATURE----- > >>> >>>>>>> >> >> >>> >>>>>>>> ---------------- > >>> >>>>>>> >> >> >>> >>>>>>>> Robert LeBlanc > >>> >>>>>>> >> >> >>> >>>>>>>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> On Tue, Sep 22, 2015 at 8:31 AM, Gregory Farnum wrote: > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>> On Tue, Sep 22, 2015 at 7:24 AM, Robert LeBlanc wrote: > >>> >>>>>>> >> >> >>> >>>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>>> -----BEGIN PGP SIGNED MESSAGE----- > >>> >>>>>>> >> >> >>> >>>>>>>>>> Hash: SHA256 > >>> >>>>>>> >> >> >>> >>>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>>> Is there some way to tell in the logs that this is happening? > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>> You can search for the (mangled) name _split_collection > >>> >>>>>>> >> >> >>> >>>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>>> I'm not > >>> >>>>>>> >> >> >>> >>>>>>>>>> seeing much I/O, CPU usage during these times. Is there some way to > >>> >>>>>>> >> >> >>> >>>>>>>>>> prevent the splitting? Is there a negative side effect to doing so? > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>> Bump up the split and merge thresholds. You can search the list for > >>> >>>>>>> >> >> >>> >>>>>>>>> this, it was discussed not too long ago. > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>>> We've had I/O block for over 900 seconds and as soon as the sessions > >>> >>>>>>> >> >> >>> >>>>>>>>>> are aborted, they are reestablished and complete immediately. > >>> >>>>>>> >> >> >>> >>>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>>> The fio test is just a seq write, starting it over (rewriting from > >>> >>>>>>> >> >> >>> >>>>>>>>>> the > >>> >>>>>>> >> >> >>> >>>>>>>>>> beginning) is still causing the issue. I was suspect that it is not > >>> >>>>>>> >> >> >>> >>>>>>>>>> having to create new file and therefore split collections. This is > >>> >>>>>>> >> >> >>> >>>>>>>>>> on > >>> >>>>>>> >> >> >>> >>>>>>>>>> my test cluster with no other load. > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>> Hmm, that does make it seem less likely if you're really not creating > >>> >>>>>>> >> >> >>> >>>>>>>>> new objects, if you're actually running fio in such a way that it's > >>> >>>>>>> >> >> >>> >>>>>>>>> not allocating new FS blocks (this is probably hard to set up?). > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>>> I'll be doing a lot of testing today. Which log options and depths > >>> >>>>>>> >> >> >>> >>>>>>>>>> would be the most helpful for tracking this issue down? > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>>> If you want to go log diving "debug osd = 20", "debug filestore = > >>> >>>>>>> >> >> >>> >>>>>>>>> 20", > >>> >>>>>>> >> >> >>> >>>>>>>>> "debug ms = 1" are what the OSD guys like to see. That should spit > >>> >>>>>>> >> >> >>> >>>>>>>>> out > >>> >>>>>>> >> >> >>> >>>>>>>>> everything you need to track exactly what each Op is doing. > >>> >>>>>>> >> >> >>> >>>>>>>>> -Greg > >>> >>>>>>> >> >> >>> >>>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>>> -- > >>> >>>>>>> >> >> >>> >>>>>>>> To unsubscribe from this list: send the line "unsubscribe ceph-devel" > >>> >>>>>>> >> >> >>> >>>>>>>> in > >>> >>>>>>> >> >> >>> >>>>>>>> the body of a message to majordomo@xxxxxxxxxxxxxxx > >>> >>>>>>> >> >> >>> >>>>>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html > >>> >>>>>>> >> >> >>> >>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>> > >>> >>>>>>> >> >> >>> >>>>>>> > >>> >>>>>>> >> >> >>> >>>>> > >>> >>>>>>> >> >> >>> >>>>> -----BEGIN PGP SIGNATURE----- > >>> >>>>>>> >> >> >>> >>>>> Version: Mailvelope v1.1.0 > >>> >>>>>>> >> >> >>> >>>>> Comment: https://www.mailvelope.com > >>> >>>>>>> >> >> >>> >>>>> > >>> >>>>>>> >> >> >>> >>>>> wsFcBAEBCAAQBQJWAdMSCRDmVDuy+mK58QAAoEgP/AqpH7i1BLpoz6fTlfWG > >>> >>>>>>> >> >> >>> >>>>> a6swvF8xvsyR15PDiPINYT0N7MgoikikGrMmhWpJ6utEr1XPW0MPFgzvNIsf > >>> >>>>>>> >> >> >>> >>>>> a1eMtNzyww4rAo6JCq6BtjmUsSKmOrBNhRNr6It9v4Nv+biqZHkiY8x/rRtV > >>> >>>>>>> >> >> >>> >>>>> s9z0cv3Q9Wqa6y/zKZg3H1XtbtUAx0r/DUwzSsP3omupZgNyaKkCgdkil9Vc > >>> >>>>>>> >> >> >>> >>>>> iyzBxFZU4+qXNT2FBG4dYDjxSHQv4psjvKR3AWXSN4yEn286KyMDjFrsDY5B > >>> >>>>>>> >> >> >>> >>>>> izS3h603QPoErqsUQngDE8COcaTAHHrV7gNJTikmGoNW6oQBjFq/z/zindTz > >>> >>>>>>> >> >> >>> >>>>> caXshVQQ+OTLo/qzJM8QPswh0TGU74SVbDkTq+eTOb5pBhQbp+42Pkkqh7jj > >>> >>>>>>> >> >> >>> >>>>> efyyYgDzpB1WrWRbUlWMNqmnjq7DT3lnAtuHyKbkwVs8x3JMPEiCl6PBvJbx > >>> >>>>>>> >> >> >>> >>>>> GnNSCqgDJrpb4fHQ2iqfQeh8Ai6AL1C1Ai19RZPrAUhpDW0/DbUvuoKSR8m7 > >>> >>>>>>> >> >> >>> >>>>> glYYuH3hpy+oPYRhFcHm2fpNJ3u9npyk2Dai9RpzQ+mWmp3xi7becYmL482H > >>> >>>>>>> >> >> >>> >>>>> +WyvLeY+8AiJQDpA0CdD8KeSlOC9bw5TPmihAIn9dVTJ1O2RlapCLqL3YAJg > >>> >>>>>>> >> >> >>> >>>>> pGyDs8ercTEJLmvEyElj5XWh5DarsGscd2LELNS/UpyuYurbPcyPKUQ0uPjp > >>> >>>>>>> >> >> >>> >>>>> gcZm > >>> >>>>>>> >> >> >>> >>>>> =CjwB > >>> >>>>>>> >> >> >>> >>>>> -----END PGP SIGNATURE----- > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>>> -- > >>> >>>>>>> >> >> >>> >>>> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > >>> >>>>>>> >> >> >>> >>>> the body of a message to majordomo@xxxxxxxxxxxxxxx > >>> >>>>>>> >> >> >>> >>>> More majordomo info at http://vger.kernel.org/majordomo-info.html > >>> >>>>>>> >> >> >>> >>>> > >>> >>>>>>> >> >> >>> >>> > >>> >>>>>>> >> >> >>> >> > >>> >>>>>>> >> >> >>> >> -----BEGIN PGP SIGNATURE----- > >>> >>>>>>> >> >> >>> >> Version: Mailvelope v1.1.0 > >>> >>>>>>> >> >> >>> >> Comment: https://www.mailvelope.com > >>> >>>>>>> >> >> >>> >> > >>> >>>>>>> >> >> >>> >> wsFcBAEBCAAQBQJWAv3QCRDmVDuy+mK58QAABr4QAJcQj8zjl606aMdkmQG7 > >>> >>>>>>> >> >> >>> >> S46iMXVav/Tv2os9GCUsQmMPx2u1w3/WmPfjByd6Divczfo0JLDDqrbsqre2 > >>> >>>>>>> >> >> >>> >> lq0GNK6e8fq6FXHhPpnL+t4uFV4UZ289cma3yklRqEBDXWHlP59Hu7VpxC5l > >>> >>>>>>> >> >> >>> >> 0MIcCg4wM5VM/LkrfcMven5em5CnjyFJYbActGzw9043rZoyUwCM+eL7sotl > >>> >>>>>>> >> >> >>> >> JYHMcNWnqwdt8TLFDhUfVGiAQyV8/6E33CuCNUEuFGdtiBKzs9IZadOI8Ce0 > >>> >>>>>>> >> >> >>> >> dod2DQNyFSvomqNq6t0DuTCSA+pT8uuks2O0NcrHjoqwIWVkxQGPYlpbpckf > >>> >>>>>>> >> >> >>> >> nxQdVM7vkqapVeQ0qUZx43Db9A5wDTC3PaEfVJZPZzWsSDjh9z7o6qHs3Kvp > >>> >>>>>>> >> >> >>> >> krfyS+dJaZ3tOYAP1VFDfasj06sOTFu3mfGYToKA75zz5HN7QZ13Zau/qhDu > >>> >>>>>>> >> >> >>> >> FHxsgk4oIXJsjj22LiSpoiigH5Ls+aVqtIbg8/vWp+EO6pK1fovEtJVeGAfE > >>> >>>>>>> >> >> >>> >> tLOdxfJJLVjMCAScFG9BRl1ePPLeptivKV0v9ruWsTpn+Q96VtqAR5GQCkYE > >>> >>>>>>> >> >> >>> >> hFrlxM+oIzHeArhhiIxSPCYLlnzxoD5IYXmTrWUYBCGvlY1mrI3j80mZ4VTj > >>> >>>>>>> >> >> >>> >> BErsSlqnjUyFKmaI7YNKyARCloMroz3wqdy/wpg/63Io62nmh5IyY+WO8hPo > >>> >>>>>>> >> >> >>> >> ae22 > >>> >>>>>>> >> >> >>> >> =AX+L > >>> >>>>>>> >> >> >>> >> -----END PGP SIGNATURE----- > >>> >>>>>>> >> >> >>> _______________________________________________ > >>> >>>>>>> >> >> >>> ceph-users mailing list > >>> >>>>>>> >> >> >>> ceph-users@xxxxxxxxxxxxxx > >>> >>>>>>> >> >> >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> >>> > >>> >>>>>>> >> >> _______________________________________________ > >>> >>>>>>> >> >> ceph-users mailing list > >>> >>>>>>> >> >> ceph-users@xxxxxxxxxxxxxx > >>> >>>>>>> >> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >>> >>>>>>> >> >> > >>> >>>>>>> >> >> > >>> >>>>>>> >> -- > >>> >>>>>>> >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > >>> >>>>>>> >> the body of a message to majordomo@xxxxxxxxxxxxxxx > >>> >>>>>>> >> More majordomo info at http://vger.kernel.org/majordomo-info.html > >>> >>>>>>> >> > >>> >>>>>>> >> > >>> >>>>>>> > >>> >>>>>>> -----BEGIN PGP SIGNATURE----- > >>> >>>>>>> Version: Mailvelope v1.2.0 > >>> >>>>>>> Comment: 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-----END PGP SIGNATURE----- > >>> >>>>>>> -- > >>> >>>>>>> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > >>> >>>>>>> the body of a message to majordomo@xxxxxxxxxxxxxxx > >>> >>>>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html > >>> >>>>>>> > >>> >>>>>>> > >>> >>>>> > >>> >>>>> -----BEGIN PGP SIGNATURE----- > >>> >>>>> Version: Mailvelope v1.2.0 > >>> >>>>> Comment: https://www.mailvelope.com > >>> >>>>> > >>> >>>>> wsFcBAEBCAAQBQJWFChuCRDmVDuy+mK58QAAfNsQAMGNu925hGNsCTuY4X7V > >>> >>>>> x71rdicFIn41I12KYtmhWl0U/V9GpUwLkOAKzeAcQiK2FgBBYRle0pANqE2K > >>> >>>>> Thf4YBJ5oEXZ72WOB14jaggiQkZwiTZLo6c69JLZADaM5NEXD/2mM77HyVLN > >>> >>>>> SP5v7FSqtnlzA53aZ7hUZn5r20VfOl/peOJGJz7C393hy3gBjr+P4LKsLE2L > >>> >>>>> QO0lNj4mJZVnVXbxqJp9Q8xn86vmfXK2sofqbAv2wjkT2C8gM9DkgLF+UJjc > >>> >>>>> mCSL9EUDFHD82BGsWzvYYFci686bIUC9IxJXKLORYKjzH3ueGHhiK3/apIi4 > >>> >>>>> 7DA0159nObAVNNz8AvvJnnjK94KrfcqpD3inFT7++WiNWTWbYljC7eukEM8L > >>> >>>>> 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info at http://vger.kernel.org/majordomo-info.html > > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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