Hello to everyone
Our ceph cluster is healthy and everything seems to go well but we have a
lot of num_strays
ceph tell mds.0 perf dump | grep stray
"num_strays": 1990574,
"num_strays_delayed": 0,
"num_strays_enqueuing": 0,
"strays_created": 3,
"strays_enqueued": 17,
"strays_reintegrated": 0,
"strays_migrated": 0,
And num_strays doesn't seems to reduce whatever we do (scrub / or scrub
~mdsdir)
And when we scrub ~mdsdir (force,recursive,repair) we get thoses error
{
"damage_type": "dir_frag",
"id": 3775653237,
"ino": 1099569233128,
"frag": "*",
"path": "~mds0/stray3/100036efce8"
},
{
"damage_type": "dir_frag",
"id": 3776355973,
"ino": 1099567262916,
"frag": "*",
"path": "~mds0/stray3/1000350ecc4"
},
{
"damage_type": "dir_frag",
"id": 3776485071,
"ino": 1099559071399,
"frag": "*",
"path": "~mds0/stray4/10002d3eea7"
},
And just before the end of the ~mdsdir scrub the mds crashes and I have to
do a
ceph mds repaired 0 to have the filesystem back online
A lot of them. Do you have any ideas of what those errors are and how
should I handle them ?
We have a lot of data in our cephfs cluster 350 TB+ and we takes snapshot
everyday of / and keep them for 1 month (rolling)
here is our cluster state
ceph -s
cluster:
id: 817b5736-84ae-11eb-bf7b-c9513f2d60a9
health: HEALTH_WARN
78 pgs not deep-scrubbed in time
70 pgs not scrubbed in time
services:
mon: 3 daemons, quorum ceph-r-112-1,ceph-g-112-3,ceph-g-112-2 (age 10d)
mgr: ceph-g-112-2.ghcodb(active, since 4d), standbys:
ceph-g-112-1.ksojnh
mds: 1/1 daemons up, 1 standby
osd: 67 osds: 67 up (since 14m), 67 in (since 7d)
data:
volumes: 1/1 healthy
pools: 5 pools, 609 pgs
objects: 186.86M objects, 231 TiB
usage: 351 TiB used, 465 TiB / 816 TiB avail
pgs: 502 active+clean
82 active+clean+snaptrim_wait
20 active+clean+snaptrim
4 active+clean+scrubbing+deep
1 active+clean+scrubbing+deep+snaptrim_wait
io:
client: 8.8 MiB/s rd, 39 MiB/s wr, 25 op/s rd, 54 op/s wr
My questions are about the damage found on the ~mdsdir scrub, should I
worry about it ? What does it mean ? It seems to be linked with my issue of
the high number of strays, is it right ? How to fix it and how to reduce
num_stray ?
Thank for all
All the best
Arnaud
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