We noticed extremely slow performance when remapping is necessary. We didn't do
anything special other than assigning the correct device_class (to ssd). When
checking ceph status, we notice the number of objects recovering is around
17-25 (with watch -n 1 -c ceph status).
How can we increase the recovery process?
There isn't any client load, because we're going to migrate to this cluster in
the future, so only a rsync once a while is being executed.
[ceph: root@pwsoel12998 /]# ceph status
cluster:
id: da3ca2e4-ee5b-11ed-8096-0050569e8c3b
health: HEALTH_WARN
noscrub,nodeep-scrub flag(s) set
services:
mon: 5 daemons, quorum
pqsoel12997,pqsoel12996,pwsoel12994,pwsoel12998,prghygpl03 (age 3h)
mgr: pwsoel12998.ylvjcb(active, since 3h), standbys: pqsoel12997.gagpbt
mds: 4/4 daemons up, 2 standby
osd: 32 osds: 32 up (since 73m), 32 in (since 6d); 10 remapped pgs
flags noscrub,nodeep-scrub
data:
volumes: 2/2 healthy
pools: 5 pools, 193 pgs
objects: 13.97M objects, 853 GiB
usage: 3.5 TiB used, 12 TiB / 16 TiB avail
pgs: 755092/55882956 objects misplaced (1.351%)
183 active+clean
10 active+remapped+backfilling
io:
recovery: 2.3 MiB/s, 20 objects/s
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