ceph pg repair

Ceph PG repair is a process that is used to fix inconsistencies or errors in Placement Groups (PGs) within a Ceph storage cluster. PGs in Ceph are responsible for distributing and replicating data across the cluster.

If a PG becomes inconsistent due to various reasons such as hardware failures, network issues, or software bugs, the data stored in that PG may become inaccessible or corrupted. During the repair process, Ceph identifies the inconsistencies and takes actions to resolve them.

To initiate the repair process, you can use the following command:

ceph pg repair <pg_spec>

Here, `<pg_spec>` refers to the specification of the PG you want to repair. This can be in the form of `<pool_id>.<pg_num>` or `<pool_name>/<pg_num>`. The `pg_num` represents the PG number, and the `pool_id` or `pool_name` represents the ID or name of the pool where the PG resides.

It's important to note that repairing PGs can be a resource-intensive task, and it may impact the performance of your Ceph cluster. Therefore, it's recommended to carefully monitor the repair process and plan it during periods of low cluster activity if possible.