Re: inconsistent PG -> unfound objects on an erasure coded system

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Here is a PG which just went inconsistent:  

pg 70.459 is active+clean+inconsistent, acting [307,210,273,191,132,450]

Attached is the result of a pg query on this.   I will wait for your feedback before issuing a repair.   

From what I read, the inconsistencies are more likely the result of ntp, but all nodes have the local ntp master and all are showing sync. 

Regards,
Jeff

On Mon, Mar 7, 2016 at 3:15 PM, Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:
[ Keeping this on the users list. ]

Okay, so next time this happens you probably want to do a pg query on
the PG which has been reported as dirty. I can't help much beyond
that, but hopefully Kefu or David will chime in once there's a little
more for them to look at.
-Greg

On Mon, Mar 7, 2016 at 1:00 PM, Jeffrey McDonald <jmcdonal@xxxxxxx> wrote:
> Hi Greg,
>
> I'm running the ceph version hammer,
> ceph version 0.94.5 (9764da52395923e0b32908d83a9f7304401fee43)
>
> The hardware migration was performed by just setting the crush map to zero
> for the OSD we wanted to retire.   The system was performing poorly with
> these older OSDs and we had a difficult time maintaining stability of the
> system.    The old OSDs are still there but all of the data is now migrated
> to new and/or existing hardware.
>
> Thanks,
> Jeff
>
>
>
>
>
> On Mon, Mar 7, 2016 at 2:56 PM, Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:
>>
>> On Mon, Mar 7, 2016 at 12:07 PM, Jeffrey McDonald <jmcdonal@xxxxxxx>
>> wrote:
>> > Hi,
>> >
>> > For a while, we've been seeing inconsistent placement groups on our
>> > erasure
>> > coded system.   The placement groups go from a state of active+clean to
>> > active+clean+inconsistent after a deep scrub:
>> >
>> >
>> > 2016-03-07 13:45:42.044131 7f385d118700 -1 log_channel(cluster) log
>> > [ERR] :
>> > 70.320s0 deep-scrub stat mismatch, got 21446/21428 objects, 0/0 clones,
>> > 21446/21428 dirty, 0/0 omap, 0/0 hit_set_archive, 0/0 whiteouts,
>> > 64682334170/64624353083 bytes,0/0 hit_set_archive bytes.
>> > 2016-03-07 13:45:42.044416 7f385d118700 -1 log_channel(cluster) log
>> > [ERR] :
>> > 70.320s0 deep-scrub 18 missing, 0 inconsistent objects
>> > 2016-03-07 13:45:42.044464 7f385d118700 -1 log_channel(cluster) log
>> > [ERR] :
>> > 70.320 deep-scrub 73 errors
>> >
>> > So I tell the placement group to perform a repair:
>> >
>> > 2016-03-07 13:49:26.047177 7f385d118700  0 log_channel(cluster) log
>> > [INF] :
>> > 70.320 repair starts
>> > 2016-03-07 13:49:57.087291 7f3858b0a700  0 -- 10.31.0.2:6874/13937 >>
>> > 10.31.0.6:6824/8127 pipe(0x2e578000 sd=697 :6874
>> >
>> > The repair finds missing shards and repairs them, but then I have 18
>> > 'unfound objects' :
>> >
>> >
>> > 2016-03-07 13:51:28.467590 7f385d118700 -1 log_channel(cluster) log
>> > [ERR] :
>> > 70.320s0 repair stat mismatch, got 21446/21428 objects, 0/0 clones,
>> > 21446/21428 dirty, 0/0 omap, 0/0 hit_set_archive, 0/0 whiteouts,
>> > 64682334170/64624353083 bytes,0/0 hit_set_archive bytes.
>> > 2016-03-07 13:51:28.468358 7f385d118700 -1 log_channel(cluster) log
>> > [ERR] :
>> > 70.320s0 repair 18 missing, 0 inconsistent objects
>> > 2016-03-07 13:51:28.469431 7f385d118700 -1 log_channel(cluster) log
>> > [ERR] :
>> > 70.320 repair 73 errors, 73 fixed
>> >
>> >
>> > I've traced one of the unfound objects all the way through the system
>> > and
>> > I've found that they are not really lost.   I can fail over the osd and
>> > recover the files.   This is happening quite regularly now after a large
>> > migration of data from old hardware to new(migration is now complete).
>> >
>> > The system sets the PG into 'recovery', but we've seen the system in a
>> > recovering state for many days.    Should we just be patient or do we
>> > need
>> > to dig further into the issue?
>>
>> You may need to dig into this more, although I'm not sure what the
>> issue is likely to be. What version of Ceph are you running? How did
>> you do this hardware migration?
>> -Greg
>>
>> >
>> >
>> > pg 70.320 is stuck unclean for 704.803040, current state
>> > active+recovering,
>> > last acting [277,101,218,49,304,412]
>> > pg 70.320 is active+recovering, acting [277,101,218,49,304,412], 18
>> > unfound
>> >
>> > There is no indication of any problems with down OSDs or network issues
>> > with
>> > OSDs.
>> >
>> > Thanks,
>> > Jeff
>> >
>> >
>> > --
>> >
>> > Jeffrey McDonald, PhD
>> > Assistant Director for HPC Operations
>> > Minnesota Supercomputing Institute
>> > University of Minnesota Twin Cities
>> > 599 Walter Library           email: jeffrey.mcdonald@xxxxxxxxxxx
>> > 117 Pleasant St SE           phone: +1 612 625-6905
>> > Minneapolis, MN 55455        fax:   +1 612 624-8861
>> >
>> >
>> >
>> > _______________________________________________
>> > ceph-users mailing list
>> > ceph-users@xxxxxxxxxxxxxx
>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >
>
>
>
>
> --
>
> Jeffrey McDonald, PhD
> Assistant Director for HPC Operations
> Minnesota Supercomputing Institute
> University of Minnesota Twin Cities
> 599 Walter Library           email: jeffrey.mcdonald@xxxxxxxxxxx
> 117 Pleasant St SE           phone: +1 612 625-6905
> Minneapolis, MN 55455        fax:   +1 612 624-8861
>
>



--
Jeffrey McDonald, PhD
Assistant Director for HPC Operations
Minnesota Supercomputing Institute
University of Minnesota Twin Cities
599 Walter Library           email: jeffrey.mcdonald@xxxxxxxxxxx
117 Pleasant St SE           phone: +1 612 625-6905
Minneapolis, MN 55455        fax:   +1 612 624-8861

Attachment: 70.459query.out
Description: Binary data

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