How to copy or migrate a Ceph pool?
Issue
Sometimes it is necessary to migrate all objects from a pool to another one, especially if it is needed to change parameters that can not be modified on pool. For example, it may be needed to migrate from a replicated pool to an EC pool, change EC profile of the pool, or to reduce the number of PGs (pg_num/pgp_num parameters of the pool).
Environment
Red Hat Ceph Storage 1.2.3
Red Hat Ceph Storage 1.3.0
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