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> 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>> 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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