|
Thanks Sage!
ceph osd dump: https://pastebin.com/raw/zLPz9DQg
ceph-monstore-tool /var/lib/ceph/mon/ceph-ufm03 dump-keys |grep osd_snap| cut -c-29 |uniq -c
2 osd_snap / purged_snap_10_000
1 osd_snap / purged_snap_12_000
75 osd_snap / purged_snap_13_000
4 osd_snap / purged_snap_14_000
778106 osd_snap / purged_snap_15_000
861 osd_snap / purged_snap_1_0000
323 osd_snap / purged_snap_4_0000
88 osd_snap / purged_snap_5_0000
2 osd_snap / purged_snap_7_0000
2 osd_snap / purged_snap_8_0000
2 osd_snap / removed_epoch_10_0
1 osd_snap / removed_epoch_12_0
75 osd_snap / removed_epoch_13_0
4 osd_snap / removed_epoch_14_0
2316417 osd_snap / removed_epoch_15_0
970 osd_snap / removed_epoch_1_00
324 osd_snap / removed_epoch_4_00
89 osd_snap / removed_epoch_5_00
2 osd_snap / removed_epoch_7_00
2 osd_snap / removed_epoch_8_00
2 osd_snap / removed_snap_10_00
1 osd_snap / removed_snap_12_00
75 osd_snap / removed_snap_13_00
4 osd_snap / removed_snap_14_00
2720849 osd_snap / removed_snap_15_00
1161 osd_snap / removed_snap_1_000
379 osd_snap / removed_snap_4_000
89 osd_snap / removed_snap_5_000
2 osd_snap / removed_snap_7_000
2 osd_snap / removed_snap_8_000
From: Sage Weil <sage@xxxxxxxxxxxx>
Sent: Monday, September 23, 2019 9:41 AM To: Koebbe, Brian <koebbe@xxxxxxxxx> Cc: ceph-users@xxxxxxx <ceph-users@xxxxxxx>; dev@xxxxxxx <dev@xxxxxxx> Subject: Re: [ceph-users] Seemingly unbounded osd_snap keys in monstore. Normal? Expected? 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. > 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. |
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