Re: backfill_toofull while OSDs are not full

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On 1/25/19 8:33 AM, Gregory Farnum wrote:
> This doesn’t look familiar to me. Is the cluster still doing recovery so
> we can at least expect them to make progress when the “out” OSDs get
> removed from the set?

The recovery has already finished. It resolves itself, but in the
meantime I saw many PGs in the backfill_toofull state for a long time.

This is new since Mimic.

Wido

> On Tue, Jan 22, 2019 at 2:44 PM Wido den Hollander <wido@xxxxxxxx
> <mailto:wido@xxxxxxxx>> wrote:
> 
>     Hi,
> 
>     I've got a couple of PGs which are stuck in backfill_toofull, but none
>     of them are actually full.
> 
>       "up": [
>         999,
>         1900,
>         145
>       ],
>       "acting": [
>         701,
>         1146,
>         1880
>       ],
>       "backfill_targets": [
>         "145",
>         "999",
>         "1900"
>       ],
>       "acting_recovery_backfill": [
>         "145",
>         "701",
>         "999",
>         "1146",
>         "1880",
>         "1900"
>       ],
> 
>     I checked all these OSDs, but they are all <75% utilization.
> 
>     full_ratio 0.95
>     backfillfull_ratio 0.9
>     nearfull_ratio 0.9
> 
>     So I started checking all the PGs and I've noticed that each of these
>     PGs has one OSD in the 'acting_recovery_backfill' which is marked as
>     out.
> 
>     In this case osd.1880 is marked as out and thus it's capacity is shown
>     as zero.
> 
>     [ceph@ceph-mgr ~]$ ceph osd df|grep 1880
>     1880   hdd 4.54599        0     0 B      0 B      0 B     0    0  27
>     [ceph@ceph-mgr ~]$
> 
>     This is on a Mimic 13.2.4 cluster. Is this expected or is this a unknown
>     side-effect of one of the OSDs being marked as out?
> 
>     Thanks,
> 
>     Wido
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