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Issue description

ch02s09 -> Defining Custom Storage Classes
States: "...Pools are logical partitions that store objects within Ceph."

This is misleading, because a ceph pool does not have any real resemblance with a partition.

We can have many pools sharing the same drives.
Any one of those pools have the ability to make use of all the capacity on the drives.

"Partition" implies that a pool has carved out a certain capacity or performance, from the cluster, which is not the case. 

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