Hi,
On Mon, 23 Sep 2019, Koebbe, Brian wrote:
> Our cluster has a little over 100 RBDs. Each RBD is snapshotted with a typical "frequently", hourly, daily, monthly type of schedule.
> A while back a 4th monitor was temporarily added to the cluster that took hours to synchronize with the other 3.
> While trying to figure out why that addition took so long, we discovered that our monitors have what seems like a really large number of osd_snap keys:
>
> ceph-monstore-tool /var/lib/ceph/mon/xxxxxx dump-keys |awk '{print $1}'|uniq -c
> 153 auth
> 2 config
> 10 health
> 1441 logm
> 3 mdsmap
> 313 mgr
> 1 mgr_command_descs
> 3 mgr_metadata
> 163 mgrstat
> 1 mkfs
> 323 mon_config_key
> 1 mon_sync
> 6 monitor
> 1 monitor_store
> 32 monmap
> 120 osd_metadata
> 1 osd_pg_creating
> 5818618 osd_snap
> 41338 osdmap
> 754 paxos
>
> A few questions:
>
> Could this be the cause of the slow addition/synchronization?
Probably!
> Is what looks like an unbounded number of osd_snaps expected?
Maybe. Can you send me the output of 'ceph osd dump'? Also, if you don't
mind doing the dump above and grepping out just the osd_snap keys, so I
can see what they look like and if they match the osd map contents?
Thanks!
sage
> If trimming/compacting them would help, how would one do that?
>
> Thanks,
> Brian
>
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