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
________________________________ The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail.