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Ceph Cookbook by Karan Singh

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The ceph-objectstore tool

One of the key features of Ceph is its self-repairing and self-healing qualities. Ceph does this by keeping multiple copies of placement groups across different OSDs and ensures very high probability that you will not lose your data. In a very rare case, you may see the failure of multiple OSDs, where one or more PG replicas are on a failed OSD, and the PG state becomes incomplete, which leads to errors in the cluster health. For granular recovery, Ceph provides a low level PG and object data recovery tool known as ceph-objectstore-tool.

How to do it…

The ceph-objectstore-tool can be a risky operation, and the command needs to be run either as root or sudo. Do not attempt this on a production cluster without engaging the ...

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