Hi to all!
We are in a situation where we have 3 PG in
"active+remapped+backfill_toofull". It happened when we executed a
"gentle-reweight" to zero of one OSD (osd.77) to swap it with a new one
(the current one registered some read errors and it's to be replaced
just-in-case).
# ceph health detail:
[WRN] PG_BACKFILL_FULL: Low space hindering backfill (add storage if this doesn't resolve itself): 3 pgs backfill_toofull
pg 10.46c is active+remapped+backfill_toofull, acting [77,607,96]
pg 10.8ad is active+remapped+backfill_toofull, acting [577,152,77]
pg 10.b15 is active+remapped+backfill_toofull, acting [483,348,77]
Our cluster is a little unbalanced and we have 7 OSD nearfull (I think
it's because we have 4 nodes with 6 TB disks and the other 19 have 10
TB, but should be unrelated, why is the cluster unbalanced I mean, to
the backfill_toofull ) not by too much (less then 88%). I'm not too much
worried about it, we will add new storage this month (if the servers
will arrive) and we will get rid of the old 6 TB servers.
If I dump the PGs I see, if I'm not mistaken, that the osd.77 will be
"replaced" by the osd.60, which is one of the nearfull ones (the top one
with 87.53% used).
# ceph pg dump:
10.b15 37236 0 0 37236 0 155249620992 0 0 5265 5265 active+remapped+backfill_toofull 2023-01-16T14:45:46.155801+0100 305742'144106 305742:901513 [483,348,60] 483 [483,348,77] 483 305211'144056 2023-01-11T10:20:56.600135+0100 305211'144056 2023-01-11T10:20:56.600135+0100 0
10.8ad 37518 0 0 37518 0 156345024512 0 0 5517 5517 active+remapped+backfill_toofull 2023-01-16T14:45:38.510038+0100 305213'142117 305742:937228 [577,60,152] 577 [577,152,77] 577 303828'142043 2023-01-06T17:52:02.523104+0100 303334'141645 2022-12-20T17:39:22.668083+0100 0
10.46c 36710 0 0 36710 0 153023443456 0 0 8172 8172 active+remapped+backfill_toofull 2023-01-16T14:45:29.284223+0100 305298'141437 305741:877331 [60,607,96] 60 [77,607,96] 77 304802'141358 2023-01-08T21:39:23.469198+0100 304363'141349 2023-01-01T18:13:45.645494+0100 0
# ceph osd df:
60 hdd 5.45999 1.00000 5.5 TiB 4.8 TiB 697 GiB 128 MiB 0 B 697 GiB 87.53 1.29 37 up
In this situation was the correct way to address the problem?
reweight-by-utilization the osd.60 to free up space (the OSD is a 6 TB
disk, and other OSD on the same host are nearfull)? There is other way
to manually map a PG to a different OSD?
Thank you for your attention
Iztok Gregori
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