Extent is a fixed-size logical storage space divided on the basis of CKG. The size is adjustable. It is the smallest unit for hot data statistics and migration (data migration granule), and is also…

Extent is a fixed-size logical storage space divided on the basis of CKG. The size is adjustable. It is the smallest unit for hot data statistics and migration (data migration granule), and is also the smallest unit for applying for and releasing space in the storage pool. An Extent belongs to a Volume or a LUN. The Extent size can be set when creating a storage pool and cannot be modified after creation. The Extent sizes of different storage pools can be different, but the Extent size in the same storage pool is unified. Extent is composed of multiple different CKQs, which can contain different types of hard disks. Extent is a logical storage space divided on the basis of CKG. It is the smallest unit for hot data statistics. The Extent size can be different in the same storage pool.