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Ceph Cookbook - Second Edition by Karan Singh, Michael Hackett, Vikhyat Umrao

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Ceph Placement Group

A Placement Group (PG) is a logical collection of objects that are replicated on OSDs to provide reliability in a storage system. Depending on the replication level of a Ceph pool, each PG is replicated and distributed on more than one OSD of a Ceph cluster. You can consider a PG as a logical container holding multiple objects, such that this logical container is mapped to multiple OSDs:

The PGs are essential for the scalability and performance of a Ceph storage system. Without PGs, it will be difficult to manage and track tens of millions of objects that are replicated and spread over hundreds of OSDs. The management ...

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