Hello,

we run a ceph cluster with the following error which came up suddenly without 
any maintenance/changes:
HEALTH_WARN Reduced data availability: 1 pg stale; Degraded data redundancy: 1 
pg undersized

The PG in question is PG 25

Output of ceph pg dump_stuck stale:

PG_STAT  STATE                             UP  UP_PRIMARY  ACTING   
ACTING_PRIMARY
25.0     stale+active+undersized+remapped  []          -1  [66,64]              
66

Both acting OSDs and the mons+managers were rebooted. All OSDs in the cluster 
are up.

Do you have any idea why 1 PG is stuck?

Best regards

Alexander Fiedler


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