30 Mar
2021
30 Mar
'21
2:11 p.m.
Hi,
from what you've sent my conclusion about the stalled I/O would be
indeed the min_size of the EC pool.
There's only one PG reported as incomplete, I assume that is the EC
pool, not the replicated pxa-rbd, right? Both pools are for rbd so I'm
guessing the rbd headers are in pxa-rbd while the data is stored in
pxa-ec, could you confirm that?
You could add 'ceph health detail' output to your question to see
which PG is incomplete.
I assume that both down OSDs are in the acting set of the inactive PG,
and since the pool's min_size is 5 the I/O pauses. If you can't wait
for recovery to finish and can't bring up at least one of those OSDs
you could set the min_size of pxa-ec to 4, but if you do, be aware
that one more disk failure could mean data loss! So think carefully
about it (maybe you could instead speed up recovery?) and don't forget
to increase min_size back to 5 when the recovery has finished, that's
very important!
Regards,
Eugen
Zitat von Rainer Krienke <krienke(a)uni-koblenz.de>de>:
Hello,
i run a ceph Nautilus cluster with 9 hosts and 144 OSDs. Last night
we lost two disks, so two OSDs (67,90) are down. The two disks are
on two different hosts. A third ODS on a third host repotrts slow
ops. ceph is repairing at the moment.
Pools affected are eg these ones:
pool 35 'pxa-rbd' replicated size 3 min_size 2 crush_rule 0
object_hash rjenkins pg_num 256 pgp_num 256 last_change 192082 lfor
0/27841/27845 flags hashpspool,selfmanaged_snaps stripe_width 0
pg_num_min 128 target_size_ratio 0.0001 application rbd
pool 36 'pxa-ec' erasure size 6 min_size 5 crush_rule 7 object_hash
rjenkins pg_num 512 pgp_num 512 last_change 192177 lfor
0/172580/172578 flags hashpspool,ec_overwrites,selfmanaged_snaps
stripe_width 16384 pg_num_min 512 target_size_ratio 0.15 application
rbd
At the mmoment the proxmox-cluster using storage from the seperate
ceph cluster hangs. The ppols with date are erasure coded with the
following profile:
crush-device-class=
crush-failure-domain=host
crush-root=default
jerasure-per-chunk-alignment=false
k=4
m=2
plugin=jerasure
technique=reed_sol_van
w=8
What I do not understand is why access on the virtualization seem to
block. Could that be related to min_size of the pools cause this
behaviour? How can I find out if this is true or what else is
causing the blocking behaviour seen?
This is the current status:
health: HEALTH_WARN
Reduced data availability: 1 pg inactive, 1 pg incomplete
Degraded data redundancy: 42384/130014984 objects
degraded (0.033%), 4 pgs degraded, 5 pgs undersized
15 daemons have recently crashed
150 slow ops, oldest one blocked for 15901 sec, daemons
[osd.60,osd.67] have slow ops.
services:
mon: 3 daemons, quorum ceph2,ceph5,ceph8 (age 4h)
mgr: ceph2(active, since 7w), standbys: ceph5, ceph8, ceph-admin
mds: cephfsrz:1 {0=ceph6=up:active} 2 up:standby
osd: 144 osds: 142 up (since 4h), 142 in (since 5h); 6 remapped pgs
task status:
scrub status:
mds.ceph6: idle
data:
pools: 15 pools, 2632 pgs
objects: 21.70M objects, 80 TiB
usage: 139 TiB used, 378 TiB / 517 TiB avail
pgs: 0.038% pgs not active
42384/130014984 objects degraded (0.033%)
2623 active+clean
3 active+undersized+degraded+remapped+backfilling
3 active+clean+scrubbing+deep
1 active+undersized+degraded+remapped+backfill_wait
1 active+undersized+remapped+backfill_wait
1 remapped+incomplete
io:
client: 2.2 MiB/s rd, 3.6 MiB/s wr, 8 op/s rd, 179 op/s wr
recovery: 51 MiB/s, 12 objects/s
Thanks a lot
Rainer
--
Rainer Krienke, Uni Koblenz, Rechenzentrum, A22, Universitaetsstrasse 1
56070 Koblenz, Web: http://www.uni-koblenz.de/~krienke, Tel: +49261287 1312
PGP: http://www.uni-koblenz.de/~krienke/mypgp.html, Fax:
+49261287 1001312
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