backfill_toofull while OSDs are not full

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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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