Extent is a block of a fixed size in a chunk group (4 MB by default). The extent is the smallest unit of a thick LUN, as well as being the smallest unit used to calculate the requested space, released space, and relocated data. For details, see Basic Storage Principles.

Other related questions:
Whether LUNs for different services of V3 series unified storage systems can contain extents of different sizes
The extent size can be set when a storage pool is created. If you want LUNs for different services to have extents of different sizes, you can create different storage pools.

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