Ever since we jumped from 14.2.9 to .12 (and beyond) a lot of the ceph commands just hang. The mgr daemon also just stops responding to our Prometheus scrapes occasionally. A daemon restart and it wakes back up. I have nothing pointing to these being related but it feels that way.
I also tried to get device health monitoring with smart up and running around that upgrade time. It never seemed to be able to pull in and report on the health across the drives. I did see the osd process firing off smartctl on occasion though so it was trying to do something. Again, I have nothing pointing to this being related but it feels like it may be.
Some commands that currently hang:
ceph osd pool autoscale-status
ceph balancer *
ceph iostat (oddly, this spit out a line of all 0 stats once and then hung)
ceph fs status
toggling ceph device monitoring on or off and a lot of the device health stuff too
Mgr logs on disk show flavors of this:
2020-11-24 13:05:07.883 7f19e2c40700 0 log_channel(audit) log [DBG] : from='mon.0 -' entity='mon.' cmd=[{,",p,r,e,f,i,x,",:, ,",o,s,d, ,p,e,r,f,",,, ,",f,o,r,m,a,t,",:, ,",j,s,o,n,",}]: dispatch
2020-11-24 13:05:07.895 7f19e2c40700 0 log_channel(audit) log [DBG] : from='mon.0 -' entity='mon.' cmd=[{,",p,r,e,f,i,x,",:, ,",o,s,d, ,p,o,o,l, ,s,t,a,t,s,",,, ,",f,o,r,m,a,t,",:, ,",j,s,o,n,",}]: dispatch
2020-11-24 13:05:08.567 7f19e1c3e700 0 log_channel(cluster) log [DBG] : pgmap v587: 17149 pgs: 1 active+remapped+backfill_wait, 2 active+clean+scrubbing, 55 active+clean+scrubbing+deep, 9 active+remapped+backfilling, 17082 active+clean; 2.1 PiB data, 3.5 PiB used, 2.9 PiB / 6.4 PiB avail; 108 MiB/s rd, 53 MiB/s wr, 1.20k op/s; 7525420/9900121381 objects misplaced (0.076%); 99 MiB/s, 40 objects/s recovering
ceph status:
cluster:
id: 971a5242-f00d-421e-9bf4-5a716fcc843a
health: HEALTH_WARN
1 nearfull osd(s)
1 pool(s) nearfull
services:
mon: 3 daemons, quorum ceph-mon-01,ceph-mon-03,ceph-mon-02 (age 4h)
mgr: ceph-mon-01(active, since 97s), standbys: ceph-mon-03, ceph-mon-02
mds: cephfs:1 {0=ceph-mds-02=up:active} 3 up:standby
osd: 843 osds: 843 up (since 13d), 843 in (since 2w); 10 remapped pgs
rgw: 1 daemon active (ceph-rgw-01)
task status:
scrub status:
mds.ceph-mds-02: idle
data:
pools: 16 pools, 17149 pgs
objects: 1.61G objects, 2.1 PiB
usage: 3.5 PiB used, 2.9 PiB / 6.4 PiB avail
pgs: 6482000/9900825469 objects misplaced (0.065%)
17080 active+clean
54 active+clean+scrubbing+deep
9 active+remapped+backfilling
5 active+clean+scrubbing
1 active+remapped+backfill_wait
io:
client: 877 MiB/s rd, 1.8 GiB/s wr, 1.91k op/s rd, 3.33k op/s wr
recovery: 136 MiB/s, 55 objects/s
ceph config dump:
WHO MASK LEVEL OPTION VALUE RO
global advanced cluster_network 192.168.42.0/24 *
global advanced mon_max_pg_per_osd 400
global advanced mon_pg_warn_max_object_skew -1.000000
global dev mon_warn_on_pool_pg_num_not_power_of_two false
global advanced osd_max_backfills 2
global advanced osd_max_scrubs 4
global advanced osd_scrub_during_recovery false
global advanced public_network 1xx.xx.171.0/24 10.16.171.0/24 *
mon advanced mon_allow_pool_delete true
mgr advanced mgr/balancer/mode none
mgr advanced mgr/devicehealth/enable_monitoring false
osd advanced bluestore_compression_mode passive
osd advanced osd_deep_scrub_large_omap_object_key_threshold 2000000
osd advanced osd_op_queue_cut_off high *
osd advanced osd_scrub_load_threshold 5.000000
mds advanced mds_beacon_grace 300.000000
mds basic mds_cache_memory_limit 16384000000
mds advanced mds_log_max_segments 256
client advanced rbd_default_features 5
client.libvirt advanced admin_socket /var/run/ceph/$cluster-$type.$id.$pid.$cctid.asok *
client.libvirt basic log_file /var/log/ceph/qemu-guest-$pid.log *
/etc/ceph/ceph.conf is the stub file with fsid and the mons listed.
Yes I have a drive that just started to tickle the full warn limit. That's what pulled me back into the "I should fix this" mode. I'm manually adjusting the weight on that one for the time being along with slowly lowering pg_num on an oversized pool. The cluster still has this issue when in health_ok.
I'm free to do a lot of debugging and poking around even though this is our production cluster. The only service I refuse to play around with is the MDS. That one bites back. Does anyone have more ideas on where to look to try and figure out what's going on?
--
Paul Mezzanini
Sr Systems Administrator / Engineer, Research Computing
Information & Technology Services
Finance & Administration
Rochester Institute of Technology
o:(585) 475-3245 | pfmeec@xxxxxxx
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