Most common Ceph placement groups errors

Understand the most common error messages that are returned by the ceph health detail command.

Placement groups that are stuck in a state that is not optimal can be listed, as described in Listing placement groups stuck in stale, inactive, or unclean states.

Note: When troubleshooting Ceph placement group errors, be sure you have both a running IBM Storage Ceph cluster and Ceph Object Gateway.