At 01:27 this morning I received the first email about MDS cache is too large
(mailing happens every 15 minutes if something happens). Looking into it, it
was again a standby-replay host which stops working.
At 01:00 a few rsync processes start in parallel on a client machine. This
copies data from a NFS share to Cephfs share to sync the latest changes. (we
want to switch to Cephfs in the near future).
This crashing of the standby-replay mds happend a couple times now, so I think
it would be good to get some help. Where should I look next?
Some cephfs information
----------------------------------
# ceph fs status
atlassian-opl - 8 clients
=============
RANK STATE MDS ACTIVITY DNS
INOS DIRS CAPS
0 active atlassian-opl.mds5.zsxfep Reqs: 0 /s 7830 7803
635 3706
0-s standby-replay atlassian-opl.mds6.svvuii Evts: 0 /s 3139 1924
461 0
POOL TYPE USED AVAIL
cephfs.atlassian-opl.meta metadata 2186M 1161G
cephfs.atlassian-opl.data data 23.0G 1161G
atlassian-prod - 12 clients
==============
RANK STATE MDS ACTIVITY DNS
INOS DIRS CAPS
0 active atlassian-prod.mds1.msydxf Reqs: 0 /s 2703k 2703k
905k 1585
1 active atlassian-prod.mds2.oappgu Reqs: 0 /s 961k 961k
317k 622
2 active atlassian-prod.mds3.yvkjsi Reqs: 0 /s 2083k 2083k
670k 443
0-s standby-replay atlassian-prod.mds4.qlvypn Evts: 0 /s 352k 352k
102k 0
1-s standby-replay atlassian-prod.mds5.egsdfl Evts: 0 /s 873k 873k
277k 0
2-s standby-replay atlassian-prod.mds6.ghonso Evts: 0 /s 2317k 2316k
679k 0
POOL TYPE USED AVAIL
cephfs.atlassian-prod.meta metadata 58.8G 1161G
cephfs.atlassian-prod.data data 5492G 1161G
MDS version: ceph version 17.2.6 (d7ff0d10654d2280e08f1ab989c7cdf3064446a5)
quincy (stable)
When looking at the log on the MDS server, I've got the following:
2023-07-21T01:21:01.942+0000 7f668a5e0700 -1 received signal: Hangup from
Kernel ( Could be generated by pthread_kill(), raise(), abort(), alarm() ) UID: 0
2023-07-21T01:23:13.856+0000 7f6688ddd700 1
mds.atlassian-prod.pwsoel13143.qlvypn Updating MDS map to version 5671 from
mon.1
2023-07-21T01:23:18.369+0000 7f6688ddd700 1
mds.atlassian-prod.pwsoel13143.qlvypn Updating MDS map to version 5672 from
mon.1
2023-07-21T01:23:31.719+0000 7f6688ddd700 1
mds.atlassian-prod.pwsoel13143.qlvypn Updating MDS map to version 5673 from
mon.1
2023-07-21T01:23:35.769+0000 7f6688ddd700 1
mds.atlassian-prod.pwsoel13143.qlvypn Updating MDS map to version 5674 from
mon.1
2023-07-21T01:28:23.764+0000 7f6688ddd700 1
mds.atlassian-prod.pwsoel13143.qlvypn Updating MDS map to version 5675 from
mon.1
2023-07-21T01:29:13.657+0000 7f6688ddd700 1
mds.atlassian-prod.pwsoel13143.qlvypn Updating MDS map to version 5676 from
mon.1
2023-07-21T01:33:43.886+0000 7f6688ddd700 1
mds.atlassian-prod.pwsoel13143.qlvypn Updating MDS map to version 5677 from
mon.1
(and another 20 lines about updating MDS map)
Alert mailings:
Mail at 01:27
----------------------------------
HEALTH_WARN
--- New ---
[WARN] MDS_CACHE_OVERSIZED: 1 MDSs report oversized cache
mds.atlassian-prod.mds4.qlvypn(mds.0): MDS cache is too large
(13GB/9GB); 0 inodes in use by clients, 0 stray files
=== Full health status ===
[WARN] MDS_CACHE_OVERSIZED: 1 MDSs report oversized cache
mds.atlassian-prod.mds4.qlvypn(mds.0): MDS cache is too large
(13GB/9GB); 0 inodes in use by clients, 0 stray files
Mail at 03:27
----------------------------------
HEALTH_OK
--- Cleared ---
[WARN] MDS_CACHE_OVERSIZED: 1 MDSs report oversized cache
mds.atlassian-prod.mds4.qlvypn(mds.0): MDS cache is too large
(14GB/9GB); 0 inodes in use by clients, 0 stray files
=== Full health status ===
Mail at 04:12
----------------------------------
HEALTH_WARN
--- New ---
[WARN] MDS_CACHE_OVERSIZED: 1 MDSs report oversized cache
mds.atlassian-prod.mds4.qlvypn(mds.0): MDS cache is too large
(15GB/9GB); 0 inodes in use by clients, 0 stray files
=== Full health status ===
[WARN] MDS_CACHE_OVERSIZED: 1 MDSs report oversized cache
mds.atlassian-prod.mds4.qlvypn(mds.0): MDS cache is too large
(15GB/9GB); 0 inodes in use by clients, 0 stray files
Best regards,
Sake
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