Sorry for the long posting but trying to cover everything
I woke up to find my cephfs filesystem down. This was in the logs
2018-07-11 05:54:10.398171 osd.1 [ERR] 2.4 full-object read crc
0x6fc2f65a != expected 0x1c08241c on 2:292cf221:::200.00000000:head
I had one standby MDS, but as far as I can tell it did not fail over.
This was in the logs
(insufficient standby MDS daemons available)
Currently my ceph looks like this
cluster:
id: ......................
health: HEALTH_ERR
1 filesystem is degraded
1 mds daemon damaged
services:
mon: 6 daemons, quorum ds26,ds27,ds2b,ds2a,ds28,ds29
mgr: ids27(active)
mds: test-cephfs-1-0/1/1 up , 3 up:standby, 1 damaged
osd: 5 osds: 5 up, 5 in
data:
pools: 3 pools, 202 pgs
objects: 1013k objects, 4018 GB
usage: 12085 GB used, 6544 GB / 18630 GB avail
pgs: 201 active+clean
1 active+clean+scrubbing+deep
io:
client: 0 B/s rd, 0 op/s rd, 0 op/s wr
I started trying to get the damaged MDS back online
Based on this page
http://docs.ceph.com/docs/master/cephfs/disaster-recovery-experts/#disaster-recovery-experts
# cephfs-journal-tool journal export backup.bin
2018-07-12 13:35:15.675964 7f3e1389bf00 -1 Header 200.00000000 is
unreadable
2018-07-12 13:35:15.675977 7f3e1389bf00 -1 journal_export: Journal not
readable, attempt object-by-object dump with `rados`
Error ((5) Input/output error)
# cephfs-journal-tool event recover_dentries summary
Events by type:
2018-07-12 13:36:03.000590 7fc398a18f00 -1 Header 200.00000000 is
unreadableErrors: 0
cephfs-journal-tool journal reset - (I think this command might have
worked)
Next up, tried to reset the filesystem
ceph fs reset test-cephfs-1 --yes-i-really-mean-it
Each time same errors
2018-07-12 11:56:35.760449 mon.ds26 [INF] Health check cleared:
MDS_DAMAGE (was: 1 mds daemon damaged)
2018-07-12 11:56:35.856737 mon.ds26 [INF] Standby daemon mds.ds27
assigned to filesystem test-cephfs-1 as rank 0
2018-07-12 11:56:35.947801 mds.ds27 [ERR] Error recovering journal
0x200: (5) Input/output error
2018-07-12 11:56:36.900807 mon.ds26 [ERR] Health check failed: 1 mds
daemon damaged (MDS_DAMAGE)
2018-07-12 11:56:35.945544 osd.0 [ERR] 2.4 full-object read crc
0x6fc2f65a != expected 0x1c08241c on 2:292cf221:::200.00000000:head
2018-07-12 12:00:00.000142 mon.ds26 [ERR] overall HEALTH_ERR 1
filesystem is degraded; 1 mds daemon damaged
Tried to 'fail' mds.ds27
# ceph mds fail ds27
# failed mds gid 1929168
Command worked, but each time I run the reset command the same errors
above appear
Online searches say the object read error has to be removed. But there's
no object listed. This web page is the closest to the issue
http://tracker.ceph.com/issues/20863
Recommends fixing error by hand. Tried running deep scrub on pg 2.4, it
completes but still have the same issue above
Final option is to attempt removing mds.ds27. If mds.ds29 was a standby
and has data it should become live. If it was not
I assume we will lose the filesystem at this point
Why didn't the standby MDS failover?
Just looking for any way to recover the cephfs, thanks!
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