I have a replicated cache pool and metadata pool which reside on ssd drives,
with a size of 2, backed by a erasure coded data pool
The cephfs filesystem was in a healthy state. I pulled an SSD drive, to perform
an exercise in osd failure.
The cluster recognized the ssd failure, and replicated back to a healthy state,
but I got a message saying the mds0 Metadata damage detected.
cluster 62ed97d6-adf4-12e4-8fd5-3d9701b22b86
health HEALTH_ERR
mds0: Metadata damage detected
mds0: Client master01.div18.swri.org failing to respond to cache
pressure
monmap e2: 3 mons at
{ceph01=192.168.19.241:6789/0,ceph02=192.168.19.242:6789/0,ceph03=192.168.19.243:6789/0}
election epoch 24, quorum 0,1,2
ceph01,darkjedi-ceph02,darkjedi-ceph03
fsmap e25: 1/1/1 up {0=-ceph04=up:active}, 1 up:standby
osdmap e1327: 20 osds: 20 up, 20 in
flags sortbitwise
pgmap v11630: 1536 pgs, 3 pools, 100896 MB data, 442 kobjects
201 GB used, 62915 GB / 63116 GB avail
1536 active+clean
In the mds logs of the active mds, I see the following:
7fad0c4b2700 0 -- 192.168.19.244:6821/17777 >> 192.168.19.243:6805/5090
pipe(0x7fad25885400 sd=56 :33513 s=1 pgs=0 cs=0 l=1 c=0x7fad2585f980).fault
7fad14add700 0 mds.beacon.darkjedi-ceph04 handle_mds_beacon no longer laggy
7fad101d3700 0 mds.0.cache.dir(10000016c08) _fetched missing object for [dir
10000016c08 /usr/ [2,head] auth v=0 cv=0/0 ap=1+0+0 state=1073741952 f() n()
hs=0+0,ss=0+0 | waiter=1 authpin=1 0x7fad25ced500]
7fad101d3700 -1 log_channel(cluster) log [ERR] : dir 10000016c08 object missing
on disk; some files may be lost
7fad0f9d2700 0 -- 192.168.19.244:6821/17777 >> 192.168.19.242:6800/3746
pipe(0x7fad25a4e800 sd=42 :0 s=1 pgs=0 cs=0 l=1 c=0x7fad25bd5180).fault
7fad14add700 -1 log_channel(cluster) log [ERR] : unmatched fragstat size on
single dirfrag 10000016c08, inode has f(v0 m2016-09-14 14:00:36.654244
13=1+12), dirfrag has f(v0 m2016-09-14 14:00:36.654244 1=0+1)
7fad14add700 -1 log_channel(cluster) log [ERR] : unmatched rstat rbytes on
single dirfrag 10000016c08, inode has n(v77 rc2016-09-14 14:00:36.654244
b1533163206 48173=43133+5040), dirfrag has n(v77 rc2016-09-14 14:00:36.654244
1=0+1)
7fad101d3700 -1 log_channel(cluster) log [ERR] : unmatched rstat on
10000016c08, inode has n(v78 rc2016-09-14 14:00:36.656244 2=0+2), dirfrags have
n(v0 rc2016-09-14 14:00:36.656244 3=0+3)
I’m not sure why the metadata got damaged, since its being replicated, but I
want to fix the issue, and test again. However, I cant figure out the steps to
repair the metadata.
I saw something about running a damage ls, but I can’t seem to find a more
detailed repair document. Any pointers to get the metadata fixed? Seems both my
mds daemons are running correctly, but that error bothers me. Shouldn’t happen
I think.
I tried the following command, but it doesn’t understand it….
ceph --admin-daemon /var/run/ceph/ceph-mds. ceph03.asok damage ls
I then rebooted all 4 ceph servers simultaneously (another stress test), and
the ceph cluster came back up healthy, and the mds damaged status has been
cleared!! I then replaced the ssd, put it back into service, and let the
backfill complete. The cluster was fully healthy. I pulled another ssd, and
repeated this process, yet I never got the damaged mds messages. Was this just
a random metadata damage due to yanking a drive out? Is there any lingering
affects of the metadata that I need to address?
- Jim
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