Alert rule: CephPGsHighPerOSD
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Overview
The number of placement groups per OSD is too high (exceeds the mon_max_pg_per_osd setting). Autoscale might be disabled or there are too few nodes in the cluster.
Steps for debugging
Check autoscale status
$ ceph_cluster_ns=syn-rook-ceph-cluster
# List pools
POOL SIZE [...] BIAS PG_NUM NEW PG_NUM AUTOSCALE PROFILE
fspool-data0 0 [...] 1.0 32 on scale-down (1)
device_health_metrics 937.0k [...] 1.0 8 on scale-down
fspool-metadata 23363k [...] 4.0 32 on scale-down
storagepool 20199 [...] 1.0 32 on scale-down| 1 | Autoscale should be on for the pool. |