Each placement group in Ceph has one or more statuses assigned to it; normally, you want to see all your PGs with active+clean against them. Understanding what each state means can help us identify what is happening to PG and whether you need to take action.
PG states – the good, the bad, and the ugly
The good ones
The following states are indications of a healthy operating cluster, for which no action needs to be taken.
The active state
The active state means that the PG is in full health, and it is capable of accepting client requests.
