Yes, the pending backport for what we have so far is in
https://github.com/ceph/ceph/pull/20055
With this changes a backfill caused by marking an osd out has the
results as shown:
health: HEALTH_WARN
115/600 objects misplaced (19.167%)
...
data:
pools: 1 pools, 1 pgs
objects: 200 objects, 310 kB
usage: 173 GB used, 126 GB / 299 GB avail
pgs: 115/600 objects misplaced (19.167%)
1 active+remapped+backfilling
David
On 1/19/18 5:14 AM, Sage Weil wrote:
On Fri, 19 Jan 2018, Ugis wrote:
Running Luminous 12.2.2, noticed strange behavior lately.
When for example setting "ceph osd out X" closer to the reballancing
end "degraded" objects still show up, but in "pgs:" section of ceph -s
no degraded pgs are still recovering, just ramapped and no degraded
pgs can be found in "ceph pg dump"
health: HEALTH_WARN
355767/30286841 objects misplaced (1.175%)
Degraded data redundancy: 28/30286841 objects degraded
(0.000%), 96 pgs unclean
services:
...
osd: 38 osds: 38 up, 37 in; 96 remapped pgs
data:
pools: 19 pools, 4176 pgs
objects: 9859k objects, 39358 GB
usage: 114 TB used, 120 TB / 234 TB avail
pgs: 28/30286841 objects degraded (0.000%)
355767/30286841 objects misplaced (1.175%)
4080 active+clean
81 active+remapped+backfilling
15 active+remapped+backfill_wait
Where those 28 degraded objects come from?
There aren't actually degraded objects.. in this case it's just
misreporting that there are.
This is a known issue in luminous. Shortly after release we noticed the
problem and David has been working on several changes to the stats
calculation to improve the reporting, but those changes have not been
backported (and aren't quite complete, either--getting a truly accurate
number there is nontrivial in some cases it turns out).
In such cases usually when backfilling is done degraded objects also
disappear, but normally degraded objects should fix before remapped
ones by priority.
Yes.
It's unfortunately a scary warning (there shouldn't be degraded
objects... and generally speaking aren't) that understandably alarms
users. We hope to have this sorted out soon!
sage
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