Analysis: extent is a fixed-size logical storage space divided on the basis of CKG, the size is adjustable, and it is a hot data system.
The smallest unit of accounting and migration (data migration granularity) is also the smallest unit of applying space and releasing space in the storage pool. Do not
The extent of the same storage pool can be different, but the extent of the same storage pool is uniform.
CKG is a logical storage unit composed of CKs from different hard drives in the same DG according to the RAID algorithm.
The smallest unit of resources allocated by the pool from the hard disk domain.
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