[ceph-users] Priority for backfilling misplaced and degraded objects

Janne Johansson icepic.dz at gmail.com
Thu Nov 1 00:47:31 PDT 2018

I think that all the misplaced PGs that are in the queue that get
writes _while_ waiting for backfill will get the "degraded" status,
meaning that before they were just on the wrong place, now they are on
the wrong place, AND the newly made PG they should backfill into will
get an old dump made first, then an incremental with all the changes
that came in while waiting or while finishing the first backfill, then
become active+clean.
Nothing to worry about, that is how recovery looks on all clusters.

Den ons 31 okt. 2018 kl 22:29 skrev Jonas Jelten <jelten at in.tum.de>:
> Hello!
> My cluster currently has this health state:
> 2018-10-31 21:20:13.694633 mon.lol [WRN] Health check update: 39010709/192173470 objects misplaced (20.300%)
> 2018-10-31 21:20:13.694684 mon.lol [WRN] Health check update: Degraded data redundancy: 1624786/192173470 objects
> degraded (0.845%), 49 pgs degraded, 57 pgs undersized (PG_DEGRADED)
> [...]
> 2018-10-31 21:39:24.113440 mon.lol [WRN] Health check update: 38897646/192173470 objects misplaced (20.241%)
> 2018-10-31 21:39:24.113526 mon.lol [WRN] Health check update: Degraded data redundancy: 1613658/192173470 objects
> degraded (0.840%), 49 pgs degraded, 57 pgs undersized (PG_DEGRADED)
> It is recovering slowly, but apparenly does not recover the 0.8% degraded objects first. Instead it recovers both at the
> same relative rate, which even means that the misplaced objects are recovered way slower than the misplaced objects!
> Is there a way to recover the degraded objects first?
> Cheers
>           -- Jonas
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May the most significant bit of your life be positive.

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