Am 12.02.2012 13:00, schrieb Jens Rehpoehler:
Hi Liste,
today i've got another problem.
ceph -w shows up with an inconsistent PG over night:
2012-02-10 08:38:48.701775 pg v441251: 1982 pgs: 1981
active+clean, 1
active+clean+inconsistent; 1790 GB data, 3368 GB used, 18977 GB /
22345
GB avail
2012-02-10 08:38:49.702789 pg v441252: 1982 pgs: 1981
active+clean, 1
active+clean+inconsistent; 1790 GB data, 3368 GB used, 18977 GB /
22345
GB avail
I've identified it with "ceph pg dump - | grep inconsistent
109.6 141 0 0 0 463820288 111780 111780
active+clean+inconsistent 485'7115 480'7301 [3
<http://marc.info/?l=ceph-devel&m=132891306919981&w=2#3>,4
<http://marc.info/?l=ceph-devel&m=132891306919981&w=2#4>] [3
<http://marc.info/?l=ceph-devel&m=132891306919981&w=2#3>,4
<http://marc.info/?l=ceph-devel&m=132891306919981&w=2#4>]
485'7061 2012-02-10 08:02:12.043986
Now I've tried to repair it with: ceph pg repair 109.6
2012-02-10 08:35:52.276325 mon<- [pg,repair,109.6]
2012-02-10 08:35:52.276776 mon.1 -> 'instructing pg 109.6 on osd.3 to
repair' (0)
but i only get the following result:
2012-02-10 08:36:18.447553 log 2012-02-10 08:36:08.455420 osd.3
10.10.10.8:6801/25980 6913 : [ERR] 109.6 osd.4: soid
1ef398ce/rb.0.0.0000000000bd/headsize 2736128 != known size 3145728
2012-02-10 08:36:18.447553 log 2012-02-10 08:36:08.455426 osd.3
10.10.10.8:6801/25980 6914 : [ERR] 109.6 scrub 0 missing, 1
inconsistent
objects
2012-02-10 08:36:18.447553 log 2012-02-10 08:36:08.455799 osd.3
10.10.10.8:6801/25980 6915 : [ERR] 109.6 scrub 1 errors
Can someone please explain me what to do in this case and how to
recover
the pg ?
So the "fix" is just to truncate the file to the expected size, 3145728,
by finding it in the current/ directory. The name/path will be slightly
weird; look for 'rb.0.0.0000000000bd'.
The data is still suspect, though. Did the ceph-osd restart or crash
recently? I would do that, repair (it should succeed), and then fsck
the
file system in that rbd image.
We just fixed a bug that was causing transactions to leak across
checkpoint/snapshot boundaries. That could be responsible for
causing all
sorts of subtle corruptions, including this one. It'll be included in
v0.42 (out next week).
sage
Hi Sarge,
no ... the osd didn't crash. I had to do some hardware maintainance
and push it
out of distribution with "ceph osd out 3". After a short while i used
"/etc/init.d/ceph stop" on that osd.
Then, after my work i've started ceph and push it in the distribution
with "ceph osd in 3".
Could you please tell me if this is the right way to get an osd out
for maintainance ? Is there
any other thing i should do to keep data consistent ?
My structure is -> 3 MDS/MON Server on seperate Hardware Nodes an 3
OSD Nodes with a each a total capacity
of 8 TB. Journaling is done on a separate SSD per node. The whole
thing is a data store for a kvm virtualisation
farm. The farm is accessing the data directly per rbd.
Thank you
Jens
Hi Sarge,
just another addition:
root@fcmsmon0:~# ceph pg dump -|grep inconsi
109.6 141 0 0 0 463820288 111780 111780
active+clean+inconsistent 558'14530 510'14829 [3,4]
[3,4] 558'14515 2012-02-12 18:29:07.793725
84.2 279 0 0 0 722016776 111780 111780
active+clean+inconsistent 558'22106 510'22528 [3,4]
[3,4] 558'22089 2012-02-12 18:29:37.089054
The repair output for the new inconsistenz is:
2012-02-12 18:29:23.933162 log 2012-02-12 18:29:20.936261 osd.3
10.10.10.8:6800/12718 1868 : [ERR] 84.2 osd.4: soid
da680ee2/rb.0.0.000000000000/headsize 2666496 != known size 3145728
2012-02-12 18:29:23.933162 log 2012-02-12 18:29:20.936274 osd.3
10.10.10.8:6800/12718 1869 : [ERR] 84.2 repair 0 missing, 1 inconsistent
objects
2012-02-12 18:29:23.933162 log 2012-02-12 18:29:20.937164 osd.3
10.10.10.8:6800/12718 1870 : [ERR] 84.2 repair stat mismatch, got
279/279 objects, 0/0 clones, 722016776/721537544 bytes.
2012-02-12 18:29:23.933162 log 2012-02-12 18:29:20.937206 osd.3
10.10.10.8:6800/12718 1871 : [ERR] 84.2 repair 2 errors, 1 fixed
Please note, that the osd hasn't been down in the last days. The
filesystem is under heavy load by more than 150 KVM vms.
Could you also please explain, how i may find the corresponding vm to
the inconsistenz to do a filesystem check ?
Thank you
Jens
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