Re: How to fix a Ceph PG in unkown state with no OSDs?

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Dear Paul,

sure, here's the current status (including crushmap):

    https://gist.github.com/oschulz/36d92af84851ec42e09ce1f3cacbc110

Any advice will be very much appreciated.


Cheers,

Oliver


On 14.06.2018 22:46, Paul Emmerich wrote:
Can you post your whole crushmap?

ceph osd getcrushmap -o crushmap
crushtool -d crushmap -o crushmap.txt


Paul


2018-06-14 22:39 GMT+02:00 Oliver Schulz <oliver.schulz@xxxxxxxxxxxxxx <mailto:oliver.schulz@xxxxxxxxxxxxxx>>:

    Thanks, Greg!!

    I reset all the OSD weights to 1.00, and I think I'm in a much
    better state now. The only trouble left in "ceph health detail" is

    PG_DEGRADED Degraded data redundancy: 4/404985012 objects degraded
    (0.000%), 3 pgs degraded
         pg 2.47 is active+recovery_wait+degraded+remapped, acting
    [177,68,187]
         pg 2.1fd is active+recovery_wait+degraded+remapped, acting
    [36,83,185]
         pg 2.748 is active+recovery_wait+degraded, acting [31,8,149]

    (There's a lot of misplaced PGs now, obviously). The interesting
    thing is that my "lost" PG is back, too, with three acting OSDs.

    Maybe I dodged the bullet - what do you think?

    One question: Is there a way to give recovery of the three
    degraded PGs priority over backfilling the misplaced ones?
    I tried "ceph pg force-recovery" but it didn't seem to have
    any effect, they were still on "recovery_wait", after.


    Cheers,

    Oliver


    On 14.06.2018 22:09, Gregory Farnum wrote:

        On Thu, Jun 14, 2018 at 4:07 PM Oliver Schulz
        <oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
        <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>> wrote:

             Hi Greg,

             I increased the hard limit and rebooted everything. The
             PG without acting OSDs still has none, but I also have
             quite a few PGs with that look like this, now:

                   pg 1.79c is stuck undersized for 470.640254, current
        state
             active+undersized+degraded, last acting [179,154]

             I had that problem before (only two acting OSDs on a few PGs),
             I always solved it by setting the primary OSD to out and then
             back in a few seconds later (resulting in a very quick
        recovery,
             then all was fine again). But maybe that's not the ideal
        solution?

             Here's "ceph pg map" for one of them:

                   osdmap e526060 pg 1.79c (1.79c) -> up [179,154]
        acting [179,154]

             I also have two PG's that have only one acting OSD, now:

                   osdmap e526060 pg 0.58a (0.58a) -> up [174] acting [174]
                   osdmap e526060 pg 2.139 (2.139) -> up [61] acting [61]

             How can I make Ceph assign three OSD's to all of these
        weird PGs?
             Before the reboot, they all did have three OSDs assigned
        (except for
             the one that has none), and they were not shown as degraded.


               > If it's the second, then fixing the remapping problem will
             resolve it.
               > That's probably/hopefully just by undoing the
        remap-by-utilization
               > changes.

             How do I do that, best? Just set all the weights back to 1.00?


        Yeah. This is probably the best way to fix up the other
        undersized PGs — at least, assuming it doesn't result in an
        over-full PG!

        I don't work with overflowing OSDs/clusters often, but my
        suspicion is you're better off with something like CERN's
        reweight scripts than using reweight-by-utilization. Unless it's
        improved without my noticing, that algorithm just isn't very
        good. :/
        -Greg



             Cheers,

             Oliver


             P.S.: Thanks so much for helping!



             On 14.06.2018 21:37, Gregory Farnum wrote:
              > On Thu, Jun 14, 2018 at 3:26 PM Oliver Schulz
              > <oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>> wrote:
              >
              >     But the contents of the remapped PGs should still be
              >     Ok, right? What confuses me is that they don't
              >     backfill - why don't the "move" where they belong?
              >
              >     As for the PG hard limit, yes, I ran into this. Our
              >     cluster had been very (very) full, but I wanted the
              >     new OSD nodes to use bluestore, so I updated to
              >     Luminous before I added the additional storage. I
              >     temporarily increased the pg hard limit and after
              >     a while (and after adding the new OSDs) the cluster
              >     seemed to be in a decent state again. Afterwards,
              >     I set the PG hard limit back to normal.
              >
              >     I don't have a "too many PGs per OSD" health warning,
              >     currently - should I still increase the PG hard limit?
              >
              >
              > Well, it's either the hard limit getting hit, or the
        fact that
             the PG
              > isn't getting mapped to any OSD and there not being an
        existing
             primary
              > to take responsibility for remapping it.
              >
              > If it's the second, then fixing the remapping problem will
             resolve it.
              > That's probably/hopefully just by undoing the
             remap-by-utilization changes.
              >
              >
              >     On 14.06.2018 20:58, Gregory Farnum wrote:
              >      > Okay, I can’t tell you what happened to that one
        pg, but
             you’ve got
              >      > another 445 remapped pgs and that’s not a good
        state to be
             in. It
              >     was
              >      > probably your use of the
        rewritten-by-utilization. :/ I am
             pretty
              >     sure
              >      > the missing PG and remapped ones have the same
        root cause,
             and it’s
              >      > possible but by no means certain fixing one will
        fix the
             others.
              >      >
              >      >
              >      > ...oh, actually, the most likely cause just came
        up in an
             unrelated
              >      > conversation. You’ve probably run into the pg
        overdose
             protection
              >     that
              >      > was added in luminous. Check the list archives
        for the exact
              >     name, but
              >      > you’ll want to increase the pg hard limit and
        restart the
             osds that
              >      > exceeded the previous/current setting.
              >      > -Greg
              >      > On Thu, Jun 14, 2018 at 2:33 PM Oliver Schulz
              >      > <oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>
              >     <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>
              >     <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>
              >     <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>>> wrote:
              >      >
              >      >     I'm not running the balancer, but I did
             reweight-by-utilization
              >      >     a few times recently.
              >      >
              >      >     "ceph osd tree" and "ceph -s" say:
              >      >
              >      >
        https://gist.github.com/oschulz/36d92af84851ec42e09ce1f3cacbc110
        <https://gist.github.com/oschulz/36d92af84851ec42e09ce1f3cacbc110>
              >      >
              >      >
              >      >
              >      >     On 14.06.2018 20:23, Gregory Farnum wrote:
              >      >      > Well, if this pg maps to no osds,
        something has
             certainly
              >     gone wrong
              >      >      > with your crush map. What’s the crush rule
        it’s
             using, and
              >     what’s
              >      >     the
              >      >      > output of “ceph osd tree”?
              >      >      > Are you running the manager’s balancer
        module or
             something
              >     that
              >      >     might be
              >      >      > putting explicit mappings into the osd map and
             broken it?
              >      >      >
              >      >      > I’m not certain off-hand about the pg
        reporting, but I
              >     believe if
              >      >     it’s
              >      >      > reporting the state as unknown that means *no*
             running osd
              >     which
              >      >      > contains any copy of that pg. That’s not
        something
             which ceph
              >      >     could do
              >      >      > on its own without failures of osds.
        What’s the
             output of
              >     “ceph -s”?
              >      >      > On Thu, Jun 14, 2018 at 2:15 PM Oliver Schulz
              >      >      > <oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>
              >     <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>
              >      >     <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>
              >     <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>>
              >      >     <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>
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        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>
              >      >     <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>
              >     <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>>>> wrote:
              >      >      >
              >      >      >     Dear Greg,
              >      >      >
              >      >      >     no, it's a very old cluster
        (continuous operation
              >     since 2013,
              >      >      >     with multiple extensions). It's a
        production
             cluster and
              >      >      >     there's about 300TB of valuable data
        on it.
              >      >      >
              >      >      >     We recently updated to luminous and
        added more
             OSDs (a
              >     month
              >      >      >     ago or so), but everything seemed Ok
        since then. We
              >     didn't have
              >      >      >     any disk failures, but we had trouble
        with the
             MDS daemons
              >      >      >     in the last days, so there were a few
        reboots.
              >      >      >
              >      >      >     Is it somehow possible to find this
        "lost" PG
             again? Since
              >      >      >     it's in the metadata pool, large parts
        of our
             CephFS
              >     directory
              >      >      >     tree are currently unavailable. I
        turned the MDS
              >     daemons off
              >      >      >     for now ...
              >      >      >
              >      >      >
              >      >      >     Cheers
              >      >      >
              >      >      >     Oliver
              >      >      >
              >      >      >     On 14.06.2018 19:59, Gregory Farnum wrote:
              >      >      >      > Is this a new cluster? Or did the
        crush map
             change
              >     somehow
              >      >      >     recently? One
              >      >      >      > way this might happen is if CRUSH
        just failed
              >     entirely to
              >      >     map a pg,
              >      >      >      > although I think if the pg exists
        anywhere it
              >     should still be
              >      >      >     getting
              >      >      >      > reported as inactive.
              >      >      >      > On Thu, Jun 14, 2018 at 8:40 AM
        Oliver Schulz
              >      >      >      > <oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>
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        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>
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             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>>
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        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>
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        <mailto:oliver.schulz@xxxxxxxxxxxxxx>
             <mailto:oliver.schulz@xxxxxxxxxxxxxx
        <mailto:oliver.schulz@xxxxxxxxxxxxxx>>>>>>> wrote:
              >      >      >      >
              >      >      >      >     Dear all,
              >      >      >      >
              >      >      >      >     I have a serious problem with
        our Ceph
             cluster:
              >     One of our
              >      >      >     PGs somehow
              >      >      >      >     ended up in this state
        (reported by "ceph
              >     health detail":
              >      >      >      >
              >      >      >      >           pg 1.XXX is stuck
        inactive for
             ..., current
              >      >     state unknown,
              >      >      >      >     last acting []
              >      >      >      >
              >      >      >      >     Also, "ceph pg map 1.xxx" reports:
              >      >      >      >
              >      >      >      >           osdmap e525812 pg 1.721
        (1.721) ->
             up []
              >     acting []
              >      >      >      >
              >      >      >      >     I can't use "ceph pg 1.XXX
        query", it just
              >     hangs with
              >      >     no output.
              >      >      >      >
              >      >      >      >     All OSDs are up and in, I have MON
             quorum, all
              >     other
              >      >     PGs seem
              >      >      >     to be
              >      >      >      >     fine.
              >      >      >      >
              >      >      >      >     How can diagnose/fix this?
             Unfortunately, the PG in
              >      >     question
              >      >      >     is part
              >      >      >      >     of the CephFS metadata pool ...
              >      >      >      >
              >      >      >      >     Any help would be very, very much
             appreciated!
              >      >      >      >
              >      >      >      >
              >      >      >      >     Cheers,
              >      >      >      >
              >      >      >      >     Oliver
     >      >      >      >  _______________________________________________
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        http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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--
Paul Emmerich

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