Hmmm, I am having a daily cron job creating these only on maybe 100 
directories. I am removing the snapshot if it exists with a rmdir. 
Should I do this differently? Maybe eg use snap-20190101, snap-20190102, 
snap-20190103 then I will always create unique directories and the ones 
removed will also be always unique.

[@ .snap]# ls -c1
snap-7
snap-6
snap-5
snap-4
snap-3
snap-2
snap-1







-----Original Message-----
From: Hector Martin [mailto:hec...@marcansoft.com] 
Sent: 07 February 2019 10:41
To: ceph-users@lists.ceph.com
Subject: Re: [ceph-users] I get weird ls pool detail output 12.2.11

On 07/02/2019 18:17, Marc Roos wrote:
> 250~1,2252~1,2254~1,2256~1,2258~1,225a~1,225c~1,225e~1,2260~1,2262~1,2
> 26 
> 4~1,2266~1,2268~1,226a~1,226c~1,226e~1,2270~1,2272~1,2274~1,2276~1,227
> 8~ 
> 1,227a~1,227c~1,227e~1,2280~1,2282~1,2284~1,2286~1,2288~1,228a~1,228c~
> 1,
> 228e~1,2290~1,2292~1,2294~1,2296~1,2298~1,229a~1,229c~1,229e~1,22a0~1,
> 22

Looks like you are creating a snapshot, creating a snapshot, deleting a 
snapshot, creating a snapshot, creating a snapshot... AIUI this pattern 
will result in an incompressible removed_snaps list. You should probably 
remove some old snapshots unless you really need them. Snapshot ID 
ranges are basically run-length compressed (interval_set), so if you end 
up with a present-removed-present-removed-present-removed pattern it 
won't compress.

I'm not sure about the performance implications of having such a "holey" 

snapshot list though. There's some discussion on this here:
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2017-September/020510.html

--
Hector Martin (hec...@marcansoft.com)
Public Key: https://mrcn.st/pub
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