Hi, I need you help really bad.
we are currently experiencing a very bad cluster hangups that happen
sporadic. (once on 2022-09-08 mid day (48 hrs after the upgrade) and once
2022-09-12 in the evening)
We use krbd without cephx for the qemu clients and when the OSDs are
getting laggy, the krbd connection comes to a grinding halt, to a point
that all IO is staling and we can't even unmap the rbd device.
From the logs, it looks like that the cluster starts to snaptrim a lot a
PGs, then PGs become laggy and then the cluster snowballs into laggy OSDs.
I have attached the monitor log and the osd log (from one OSD) around the
time where it happened.
- is this a known issue?
- what can I do to debug it further?
- can I downgrade back to nautilus?
- should I upgrade the PGs for the pool to 4096 or 8192?
The cluster contains a mixture of 2,4 and 8TB SSDs (no rotating disks)
where the 8TB disks got ~120PGs and the 2TB disks got ~30PGs. All hosts
have a minimum of 128GB RAM and the kernel logs of all ceph hosts do not
show anything for the timeframe.
Cluster stats:
cluster:
id: 74313356-3b3d-43f3-bce6-9fb0e4591097
health: HEALTH_OK
services:
mon: 3 daemons, quorum ceph-rbd-mon4,ceph-rbd-mon5,ceph-rbd-mon6 (age
25h)
mgr: ceph-rbd-mon5(active, since 4d), standbys: ceph-rbd-mon4,
ceph-rbd-mon6
osd: 149 osds: 149 up (since 6d), 149 in (since 7w)
data:
pools: 4 pools, 2241 pgs
objects: 25.43M objects, 82 TiB
usage: 231 TiB used, 187 TiB / 417 TiB avail
pgs: 2241 active+clean
io:
client: 211 MiB/s rd, 273 MiB/s wr, 1.43k op/s rd, 8.80k op/s wr
--- RAW STORAGE ---
CLASS SIZE AVAIL USED RAW USED %RAW USED
ssd 417 TiB 187 TiB 230 TiB 231 TiB 55.30
TOTAL 417 TiB 187 TiB 230 TiB 231 TiB 55.30
--- POOLS ---
POOL ID PGS STORED OBJECTS USED %USED MAX AVAIL
isos 7 64 455 GiB 117.92k 1.3 TiB 1.17 38 TiB
rbd 8 2048 76 TiB 24.65M 222 TiB 66.31 38 TiB
archive 9 128 2.4 TiB 669.59k 7.3 TiB 6.06 38 TiB
device_health_metrics 10 1 25 MiB 149 76 MiB 0 38 TiB
--
Die Selbsthilfegruppe "UTF-8-Probleme" trifft sich diesmal abweichend im
groüen Saal.
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