Re: [ceph-users] Inconsistent PGs that ceph pg repair does not fix

[Andras Pataki <apataki@simonsfoundation.org>]

Cool, thanks!

Andras

________________________________________
From: Sage Weil <sweil@redhat.com>
Sent: Tuesday, September 8, 2015 2:07 PM
To: Andras Pataki
Cc: Samuel Just; ceph-users@lists.ceph.com; ceph-devel@vger.kernel.org
Subject: Re: [ceph-users] Inconsistent PGs that ceph pg repair does not fix

On Tue, 8 Sep 2015, Andras Pataki wrote:
> Hi Sam,
>
> I saw that ceph 0.94.3 is out and it contains a resolution to the issue below (http://tracker.ceph.com/issues/12577).  I installed it on our cluster, but unfortunately it didn't resolve the issue.  Same as before, I have a couple of inconsistent pg's, and run ceph pg repair on them - the OSD says:
>
> 2015-09-08 11:21:53.930324 7f49c17ea700  0 log_channel(cluster) log [INF] : 2.439 repair starts
> 2015-09-08 11:27:57.708394 7f49c17ea700 -1 log_channel(cluster) log [ERR] : repair 2.439 b029e439/10000022d93.00000f0c/head//2 on disk data digest 0xb3d78a6e != 0xa3944ad0
> 2015-09-08 11:28:32.359938 7f49c17ea700 -1 log_channel(cluster) log [ERR] : 2.439 repair 1 errors, 0 fixed
> 2015-09-08 11:28:32.364506 7f49c17ea700  0 log_channel(cluster) log [INF] : 2.439 deep-scrub starts
> 2015-09-08 11:29:18.650876 7f49c17ea700 -1 log_channel(cluster) log [ERR] : deep-scrub 2.439 b029e439/10000022d93.00000f0c/head//2 on disk data digest 0xb3d78a6e != 0xa3944ad0
> 2015-09-08 11:29:23.136109 7f49c17ea700 -1 log_channel(cluster) log [ERR] : 2.439 deep-scrub 1 errors
>
> $ ceph tell osd.* version | grep version | sort | uniq -c
>      94     "version": "ceph version 0.94.3 (95cefea9fd9ab740263bf8bb4796fd864d9afe2b)"
>
> Could you have another look?

The fix was merged into master in
6a949e10198a1787f2008b6c537b7060d191d236, after v0.94.3 was released.  It
will be in v0.94.4.

Note that we had a bunch of similar errors on our internal lab cluster and
this resolved them.  We installed the test build from gitbuilder,
available at
http://gitbuilder.ceph.com/ceph-rpm-centos7-x86_64-basic/ref/hammer/ (or
similar, adjust URL for your distro).

sage


>
> Thanks,
>
> Andras
>
>
> ________________________________________
> From: Andras Pataki
> Sent: Monday, August 3, 2015 4:09 PM
> To: Samuel Just
> Cc: ceph-users@lists.ceph.com; ceph-devel@vger.kernel.org
> Subject: Re: [ceph-users] Inconsistent PGs that ceph pg repair does not fix
>
> Done: http://tracker.ceph.com/issues/12577
> BTW, I¹m using the latest release 0.94.2 on all machines.
>
> Andras
>
>
> On 8/3/15, 3:38 PM, "Samuel Just" <sjust@redhat.com> wrote:
>
> >Hrm, that's certainly supposed to work.  Can you make a bug?  Be sure
> >to note what version you are running (output of ceph-osd -v).
> >-Sam
> >
> >On Mon, Aug 3, 2015 at 12:34 PM, Andras Pataki
> ><apataki@simonsfoundation.org> wrote:
> >> Summary: I am having problems with inconsistent PG's that the 'ceph pg
> >> repair' command does not fix.  Below are the details.  Any help would be
> >> appreciated.
> >>
> >> # Find the inconsistent PG's
> >> ~# ceph pg dump | grep inconsistent
> >> dumped all in format plain
> >> 2.439 42080 00 017279507143 31033103 active+clean+inconsistent2015-08-03
> >> 14:49:17.29288477323'2250145 77480:890566 [78,54]78 [78,54]78
> >> 77323'22501452015-08-03 14:49:17.29253877323'2250145 2015-08-03
> >> 14:49:17.292538
> >> 2.8b9 40830 00 016669590823 30513051 active+clean+inconsistent2015-08-03
> >> 14:46:05.14006377323'2249886 77473:897325 [7,72]7 [7,72]7
> >> 77323'22498862015-08-03 14:22:47.83406377323'2249886 2015-08-03
> >> 14:22:47.834063
> >>
> >> # Look at the first one:
> >> ~# ceph pg deep-scrub 2.439
> >> instructing pg 2.439 on osd.78 to deep-scrub
> >>
> >> # The logs of osd.78 show:
> >> 2015-08-03 15:16:34.409738 7f09ec04a700  0 log_channel(cluster) log
> >>[INF] :
> >> 2.439 deep-scrub starts
> >> 2015-08-03 15:16:51.364229 7f09ec04a700 -1 log_channel(cluster) log
> >>[ERR] :
> >> deep-scrub 2.439 b029e439/10000022d93.00000f0c/head//2 on disk data
> >>digest
> >> 0xb3d78a6e != 0xa3944ad0
> >> 2015-08-03 15:16:52.763977 7f09ec04a700 -1 log_channel(cluster) log
> >>[ERR] :
> >> 2.439 deep-scrub 1 errors
> >>
> >> # Finding the object in question:
> >> ~# find ~ceph/osd/ceph-78/current/2.439_head -name
> >>10000022d93.00000f0c* -ls
> >> 21510412310 4100 -rw-r--r--   1 root     root      4194304 Jun 30 17:09
> >>
> >>/var/lib/ceph/osd/ceph-78/current/2.439_head/DIR_9/DIR_3/DIR_4/DIR_E/1000
> >>0022d93.00000f0c__head_B029E439__2
> >> ~# md5sum
> >>
> >>/var/lib/ceph/osd/ceph-78/current/2.439_head/DIR_9/DIR_3/DIR_4/DIR_E/1000
> >>0022d93.00000f0c__head_B029E439__2
> >> 4e4523244deec051cfe53dd48489a5db
> >>
> >>/var/lib/ceph/osd/ceph-78/current/2.439_head/DIR_9/DIR_3/DIR_4/DIR_E/1000
> >>0022d93.00000f0c__head_B029E439__2
> >>
> >> # The object on the backup osd:
> >> ~# find ~ceph/osd/ceph-54/current/2.439_head -name
> >>10000022d93.00000f0c* -ls
> >> 6442614367 4100 -rw-r--r--   1 root     root      4194304 Jun 30 17:09
> >>
> >>/var/lib/ceph/osd/ceph-54/current/2.439_head/DIR_9/DIR_3/DIR_4/DIR_E/1000
> >>0022d93.00000f0c__head_B029E439__2
> >> ~# md5sum
> >>
> >>/var/lib/ceph/osd/ceph-54/current/2.439_head/DIR_9/DIR_3/DIR_4/DIR_E/1000
> >>0022d93.00000f0c__head_B029E439__2
> >> 4e4523244deec051cfe53dd48489a5db
> >>
> >>/var/lib/ceph/osd/ceph-54/current/2.439_head/DIR_9/DIR_3/DIR_4/DIR_E/1000
> >>0022d93.00000f0c__head_B029E439__2
> >>
> >> # They don't seem to be different.
> >> # When I try repair:
> >> ~# ceph pg repair 2.439
> >> instructing pg 2.439 on osd.78 to repair
> >>
> >> # The osd.78 logs show:
> >> 2015-08-03 15:19:21.775933 7f09ec04a700  0 log_channel(cluster) log
> >>[INF] :
> >> 2.439 repair starts
> >> 2015-08-03 15:19:38.088673 7f09ec04a700 -1 log_channel(cluster) log
> >>[ERR] :
> >> repair 2.439 b029e439/10000022d93.00000f0c/head//2 on disk data digest
> >> 0xb3d78a6e != 0xa3944ad0
> >> 2015-08-03 15:19:39.958019 7f09ec04a700 -1 log_channel(cluster) log
> >>[ERR] :
> >> 2.439 repair 1 errors, 0 fixed
> >> 2015-08-03 15:19:39.962406 7f09ec04a700  0 log_channel(cluster) log
> >>[INF] :
> >> 2.439 deep-scrub starts
> >> 2015-08-03 15:19:56.510874 7f09ec04a700 -1 log_channel(cluster) log
> >>[ERR] :
> >> deep-scrub 2.439 b029e439/10000022d93.00000f0c/head//2 on disk data
> >>digest
> >> 0xb3d78a6e != 0xa3944ad0
> >> 2015-08-03 15:19:58.348083 7f09ec04a700 -1 log_channel(cluster) log
> >>[ERR] :
> >> 2.439 deep-scrub 1 errors
> >>
> >> The inconsistency is not fixed.  Any hints of what should be done next?
> >> I have tried  a few things:
> >>  * Stop the primary osd, remove the object from the filesystem, restart
> >>the
> >> OSD and issue a repair.  It didn't work - it sais that one object is
> >> missing, but did not copy it from the backup.
> >>  * I tried the same on the backup (remove the file) - it also didn't get
> >> copied back from the primary in a repair.
> >>
> >> Any help would be appreciated.
> >>
> >> Thanks,
> >>
> >> Andras
> >> apataki@simonsfoundation.org
> >>
> >>
> >> _______________________________________________
> >> ceph-users mailing list
> >> ceph-users@lists.ceph.com
> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> >>
>
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