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Prior to the OSD being marked as down by the cluster, do you note the PGs become inactive on it? Using a flag such as nodown may prevent OSDs flapping if it helps reduce the IO load to see if things stabilise out, but be wary of this flag as I believe PGs using
the OSD as the primary will not failover to another OSD while nodown is set.
My thoughts here, albeit I am shooting in the dark a little with this theory, is perhaps individual OSDs being overloaded and not returning a heartbeat as a result of the load. When OSDs are marked as down and new maps are distributed this would add further
load so while it keeps recalculating it may be a vicious cycle which may be alleviated if it could stabilise.
With networks mainly idle, do you see any spikes at all? Perhaps an OSD coming online, OSD attempts backfill/recovery and QoS dropping the heartbeat packets if it overloads the link?
Just spitballing some ideas here until somebody more qualified may have an idea.
From: Bryan Banister <bbanister@xxxxxxxxxxxxxxx>
Sent: 17 July 2018 19:18:15 To: Bryan Banister; Tom W; ceph-users@xxxxxxxxxxxxxx Subject: RE: Cluster in bad shape, seemingly endless cycle of OSDs failed, then marked down, then booted, then failed again I didn’t find anything obvious in the release notes about this issue we see to have, but I don’t understand it really. We have seen logs indicating some kind of heartbeat issue with OSDs, but we don’t believe there is any issues with the networking between the nodes, which are mostly idle as well: 2018-07-17 17:41:32.903871 I | osd12: 2018-07-17 17:41:32.903793 7fffef198700 -1 osd.12 4296 heartbeat_check: no reply from 7.129.220.44:6866 osd.219 ever on either front or back, first ping sent 2018-07-17 17:41:09.893761
(cutoff 2018-07-17 17:41:12.903604) 2018-07-17 17:41:32.903875 I | osd12: 2018-07-17 17:41:32.903795 7fffef198700 -1 osd.12 4296 heartbeat_check: no reply from 7.129.220.44:6922 osd.220 ever on either front or back, first ping sent 2018-07-17 17:41:09.893761
(cutoff 2018-07-17 17:41:12.903604) 2018-07-17 17:41:32.903878 I | osd12: 2018-07-17 17:41:32.903798 7fffef198700 -1 osd.12 4296 heartbeat_check: no reply from 7.129.220.44:6901 osd.221 ever on either front or back, first ping sent 2018-07-17 17:41:09.893761
(cutoff 2018-07-17 17:41:12.903604) 2018-07-17 17:41:32.903880 I | osd12: 2018-07-17 17:41:32.903800 7fffef198700 -1 osd.12 4296 heartbeat_check: no reply from 7.129.220.44:6963 osd.222 ever on either front or back, first ping sent 2018-07-17 17:41:09.893761
(cutoff 2018-07-17 17:41:12.903604) 2018-07-17 17:41:32.903884 I | osd12: 2018-07-17 17:41:32.903803 7fffef198700 -1 osd.12 4296 heartbeat_check: no reply from 7.129.220.44:6907 osd.224 ever on either front or back, first ping sent 2018-07-17 17:41:09.893761
(cutoff 2018-07-17 17:41:12.903604) Is there a way to resolve this issue, which seems to be the root cause of the OSDs being marked as failed. Thanks in advance for any help, -Bryan From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx]
On Behalf Of Bryan Banister Note: External Email Hi Tom, We’re apparently running ceph version 12.2.5 on a Rook based cluster. We have EC pools on large 8TB HDDs and metadata on bluestore OSDs on NVMe drives. I’ll look at the release notes. Thanks! -Bryan From: Tom W [mailto:Tom.W@xxxxxxxxxxxx]
Note: External Email Hi Bryan, What version of Ceph are you currently running on, and do you run any erasure coded pools or bluestore OSDs? Might be worth having a quick glance over the recent changelogs: http://docs.ceph.com/docs/master/releases/luminous/ Tom From: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> on behalf of Bryan Banister <bbanister@xxxxxxxxxxxxxxx> Hi all, We’re still very new to managing Ceph and seem to have cluster that is in an endless loop of failing OSDs, then marking them down, then booting them again: Here are some example logs: 2018-07-17 16:48:28.976673 mon.rook-ceph-mon7 [INF] osd.83 failed (root=default,host=carg-kubelet-osd04) (3 reporters from different host after 61.491973 >= grace 20.010293) 2018-07-17 16:48:28.976730 mon.rook-ceph-mon7 [INF] osd.84 failed (root=default,host=carg-kubelet-osd04) (3 reporters from different host after 61.491916 >= grace 20.010293) 2018-07-17 16:48:28.976785 mon.rook-ceph-mon7 [INF] osd.85 failed (root=default,host=carg-kubelet-osd04) (3 reporters from different host after 61.491870 >= grace 20.011151) 2018-07-17 16:48:28.976843 mon.rook-ceph-mon7 [INF] osd.86 failed (root=default,host=carg-kubelet-osd04) (3 reporters from different host after 61.491828 >= grace 20.010293) 2018-07-17 16:48:28.976890 mon.rook-ceph-mon7 [INF] Marking osd.1 out (has been down for 605 seconds) 2018-07-17 16:48:28.976913 mon.rook-ceph-mon7 [INF] Marking osd.2 out (has been down for 605 seconds) 2018-07-17 16:48:28.976933 mon.rook-ceph-mon7 [INF] Marking osd.3 out (has been down for 605 seconds) 2018-07-17 16:48:28.976954 mon.rook-ceph-mon7 [INF] Marking osd.4 out (has been down for 605 seconds) 2018-07-17 16:48:28.976979 mon.rook-ceph-mon7 [INF] Marking osd.9 out (has been down for 605 seconds) 2018-07-17 16:48:28.977000 mon.rook-ceph-mon7 [INF] Marking osd.10 out (has been down for 605 seconds) 2018-07-17 16:48:28.977020 mon.rook-ceph-mon7 [INF] Marking osd.11 out (has been down for 605 seconds) 2018-07-17 16:48:28.977040 mon.rook-ceph-mon7 [INF] Marking osd.12 out (has been down for 605 seconds) 2018-07-17 16:48:28.977059 mon.rook-ceph-mon7 [INF] Marking osd.13 out (has been down for 605 seconds) 2018-07-17 16:48:28.977079 mon.rook-ceph-mon7 [INF] Marking osd.14 out (has been down for 605 seconds) 2018-07-17 16:48:30.889316 mon.rook-ceph-mon7 [INF] osd.55 7.129.218.12:6920/90761 boot 2018-07-17 16:48:31.113052 mon.rook-ceph-mon7 [WRN] Health check update: 4946/8854434 objects misplaced (0.056%) (OBJECT_MISPLACED) 2018-07-17 16:48:31.113087 mon.rook-ceph-mon7 [WRN] Health check update: Degraded data redundancy: 7951/8854434 objects degraded (0.090%), 88 pgs degraded, 273 pgs undersized (PG_DEGRADED) 2018-07-17 16:48:32.763546 mon.rook-ceph-mon7 [WRN] Health check update: Reduced data availability: 10439 pgs inactive, 8994 pgs down, 1639 pgs peering, 88 pgs incomplete, 3430 pgs stale (PG_AVAILABILITY) 2018-07-17 16:48:32.763578 mon.rook-ceph-mon7 [WRN] Health check update: 29 slow requests are blocked > 32 sec (REQUEST_SLOW) 2018-07-17 16:48:34.096178 mon.rook-ceph-mon7 [INF] osd.88 failed (root=default,host=carg-kubelet-osd04) (3 reporters from different host after 66.612054 >= grace 20.010283) 2018-07-17 16:48:34.108020 mon.rook-ceph-mon7 [WRN] Health check update: 112 osds down (OSD_DOWN) 2018-07-17 16:48:38.736108 mon.rook-ceph-mon7 [WRN] Health check update: 4946/8843715 objects misplaced (0.056%) (OBJECT_MISPLACED) 2018-07-17 16:48:38.736140 mon.rook-ceph-mon7 [WRN] Health check update: Reduced data availability: 10415 pgs inactive, 9000 pgs down, 1635 pgs peering, 88 pgs incomplete, 3418 pgs stale (PG_AVAILABILITY) 2018-07-17 16:48:38.736166 mon.rook-ceph-mon7 [WRN] Health check update: Degraded data redundancy: 7949/8843715 objects degraded (0.090%), 86 pgs degraded, 267 pgs undersized (PG_DEGRADED) 2018-07-17 16:48:40.430146 mon.rook-ceph-mon7 [WRN] Health check update: 111 osds down (OSD_DOWN) 2018-07-17 16:48:40.812579 mon.rook-ceph-mon7 [INF] osd.117 7.129.217.10:6833/98090 boot 2018-07-17 16:48:42.427204 mon.rook-ceph-mon7 [INF] osd.115 7.129.217.10:6940/98114 boot 2018-07-17 16:48:42.427297 mon.rook-ceph-mon7 [INF] osd.100 7.129.217.10:6899/98091 boot 2018-07-17 16:48:42.427502 mon.rook-ceph-mon7 [INF] osd.95 7.129.217.10:6901/98092 boot Not sure this is going to fix itself. Any ideas on how to handle this situation?? Thanks in advance! -Bryan
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