Hi,
We're a student club from Montréal where we host an Openstack cloud with
a Ceph backend for storage of virtual machines and volumes using rbd.
Two weeks ago we received an email from our ceph cluster saying that
some pages were damaged. We ran "sudo ceph pg repair <pg-id>" but then
there was an I/O error on the disk during the recovery ("An
unrecoverable disk media error occurred on Disk 4 in Backplane 1 of
Integrated RAID Controller 1." and "Bad block medium error is detected
at block 0x1377e2ad on Virtual Disk 3 on Integrated RAID Controller 1."
messages on iDRAC).
After that, the PG we tried to repair was in the state
"active+recovery_unfound+degraded". After a week, we ran the command
"sudo ceph pg 2.1b mark_unfound_lost revert" to try to recover the
damaged PG. We tried to boot the virtual machine that had crashed
because of this incident, but the volume seemed to have been completely
erased, the "mount" command said there was no filesystem on it, so we
recreated the VM from a backup.
A few days later, the same PG was once again damaged, and since we knew
the physical disk on the OSD hosting one part of the PG had problems, we
tried to "out" the OSD from the cluster. That resulted in the two other
OSDs hosting copies of the problematic PG to go down, which caused
timeouts on our virtual machines, so we put the OSD back in.
We then tried to repair the PG again, but that failed and the PG is now
"active+clean+inconsistent+failed_repair", and whenever it goes down,
two other OSDs from two other hosts go down too after a few minutes, so
it's impossible to replace the disk right now, even if we have new ones
available.
We have backups for most of our services, but it would be very
disrupting to delete the whole cluster, and we don't know that to do
with the broken PG and the OSD that can't be shut down.
Any help would be really appreciated, we're not experts with Ceph and
Openstack, and it's likely we handled things wrong at some point, but we
really want to go back to a healthy Ceph.
Here are some information about our cluster :
romain:step@alpha-cen ~ $ sudo ceph health detail
HEALTH_ERR 1 scrub errors; Possible data damage: 1 pg inconsistent
[ERR] OSD_SCRUB_ERRORS: 1 scrub errors
[ERR] PG_DAMAGED: Possible data damage: 1 pg inconsistent
pg 2.1b is active+clean+inconsistent+failed_repair, acting [3,11,0]
romain:step@alpha-cen ~ $ sudo ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 70.94226 root default
-7 20.00792 host alpha-cen
3 hdd 1.81879 osd.3 up 1.00000 1.00000
6 hdd 1.81879 osd.6 up 1.00000 1.00000
12 hdd 1.81879 osd.12 up 1.00000 1.00000
13 hdd 1.81879 osd.13 up 1.00000 1.00000
15 hdd 1.81879 osd.15 up 1.00000 1.00000
16 hdd 9.09520 osd.16 up 1.00000 1.00000
17 hdd 1.81879 osd.17 up 1.00000 1.00000
-5 23.64874 host beta-cen
1 hdd 5.45749 osd.1 up 1.00000 1.00000
4 hdd 5.45749 osd.4 up 1.00000 1.00000
8 hdd 5.45749 osd.8 up 1.00000 1.00000
11 hdd 5.45749 osd.11 up 1.00000 1.00000
14 hdd 1.81879 osd.14 up 1.00000 1.00000
-3 27.28560 host gamma-cen
0 hdd 9.09520 osd.0 up 1.00000 1.00000
5 hdd 9.09520 osd.5 up 1.00000 1.00000
9 hdd 9.09520 osd.9 up 1.00000 1.00000
romain:step@alpha-cen ~ $ sudo rados list-inconsistent-obj 2.1b
{"epoch":9787,"inconsistents":[]}
romain:step@alpha-cen ~ $ sudo ceph pg 2.1b query
https://pastebin.com/gsKCPCjr
Best regards,
Romain Lebbadi-Breteau
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