You have 4 OSDs that are near_full, and the errors seem to be pointed to pg_create, possibly from a backfill. Ceph will stop backfills to near_full osds. I'm guessing that is the cause of your blocked IO. Try reweighting the full OSDs down to move PGs off them. ---------------- Robert LeBlanc PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 On Tue, Oct 8, 2019 at 6:53 AM Thomas <74cmonty@gmail.com> wrote:

Hi, ceph status reports: root@ld3955:~# ceph -s cluster: id: 6b1b5117-6e08-4843-93d6-2da3cf8a6bae health: HEALTH_ERR 1 filesystem is degraded 1 filesystem has a failed mds daemon 1 filesystem is offline insufficient standby MDS daemons available 4 nearfull osd(s) 1 pool(s) nearfull Reduced data availability: 59 pgs inactive, 16 pgs peering Degraded data redundancy: 597/153910758 objects degraded (0.000%), 2 pgs degraded, 1 pg undersized Degraded data redundancy (low space): 23 pgs backfill_toofull 1 pgs not deep-scrubbed in time 4 pgs not scrubbed in time 3 pools have too many placement groups 164 slow requests are blocked > 32 sec 1082 stuck requests are blocked > 4096 sec 1490 slow ops, oldest one blocked for 19711 sec, daemons [osd,0,osd,175,osd,186,osd,5,osd,6,osd,63,osd,68,osd,9,mon,ld5505,mon,ld5506]... have slow ops.

services: mon: 3 daemons, quorum ld5505,ld5506,ld5507 (age 5h) mgr: ld5507(active, since 5h), standbys: ld5506, ld5505 mds: pve_cephfs:0/1, 1 failed osd: 419 osds: 416 up, 416 in; 6024 remapped pgs

data: pools: 6 pools, 8864 pgs objects: 51.30M objects, 196 TiB usage: 594 TiB used, 907 TiB / 1.5 PiB avail pgs: 0.666% pgs not active 597/153910758 objects degraded (0.000%) 52964415/153910758 objects misplaced (34.412%) 5954 active+remapped+backfill_wait 2786 active+clean 40 active+remapped+backfilling 35 activating 23 active+remapped+backfill_wait+backfill_toofull 16 peering 7 activating+remapped 1 activating+undersized+degraded 1 active+clean+scrubbing 1 active+recovering+degraded

io: client: 3.5 KiB/s wr, 0 op/s rd, 0 op/s wr recovery: 551 MiB/s, 137 objects/s

I'm concerned about the slow ops on osd.0 and osd.9. On the relevant OSD node I can see 2 relevant services running for hours: ceph 14795 1 99 09:58 ? 08:49:22 /usr/bin/ceph-osd -f --cluster ceph --id 9 --setuser ceph --setgroup ceph ceph 15394 1 99 09:58 ? 07:10:00 /usr/bin/ceph-osd -f --cluster ceph --id 0 --setuser ceph --setgroup ceph

In the relevant osd log I can find similar messages: root@ld5505:~# tail -f /var/log/ceph/ceph-osd.0.log 2019-10-08 15:35:32.830 7ff60c7cc700 -1 osd.0 233323 get_health_metrics reporting 236 slow ops, oldest is osd_pg_create(e233257 38.0:199987) 2019-10-08 15:35:33.806 7ff60c7cc700 -1 osd.0 233323 get_health_metrics reporting 236 slow ops, oldest is osd_pg_create(e233257 38.0:199987) 2019-10-08 15:35:34.842 7ff60c7cc700 -1 osd.0 233323 get_health_metrics reporting 236 slow ops, oldest is osd_pg_create(e233257 38.0:199987) 2019-10-08 15:35:35.862 7ff60c7cc700 -1 osd.0 233323 get_health_metrics reporting 236 slow ops, oldest is osd_pg_create(e233257 38.0:199987)

root@ld5505:~# tail -f /var/log/ceph/ceph-osd.9.log 2019-10-08 15:35:38.822 7f8957599700 -1 osd.9 233407 get_health_metrics reporting 818 slow ops, oldest is osd_op(client.53385387.0:23 30.f7 30.bcc140f7 (undecoded) ondisk+retry+read+known_if_redirected e233362) 2019-10-08 15:35:39.854 7f8957599700 -1 osd.9 233407 get_health_metrics reporting 818 slow ops, oldest is osd_op(client.53385387.0:23 30.f7 30.bcc140f7 (undecoded) ondisk+retry+read+known_if_redirected e233362) 2019-10-08 15:35:40.850 7f8957599700 -1 osd.9 233407 get_health_metrics reporting 818 slow ops, oldest is osd_op(client.53385387.0:23 30.f7 30.bcc140f7 (undecoded) ondisk+retry+read+known_if_redirected e233362) 2019-10-08 15:35:41.862 7f8957599700 -1 osd.9 233407 get_health_metrics reporting 818 slow ops, oldest is osd_op(client.53385387.0:23 30.f7 30.bcc140f7 (undecoded) ondisk+retry+read+known_if_redirected e233362)

Question: How can I analyse and solve the issue with slow ops?

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