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How disk checksum types affect aggregate and spare management

There are two checksum types available for disks used by Data ONTAP: BCS (block) and AZCS (zoned). Understanding how the checksum types differ and how they impact storage management enables you to manage your storage more effectively.

Both checksum types provide the same resiliency capabilities; BCS optimizes data access speed and capacity for disks that use 520 byte sectors. AZCS provides enhanced storage utilization and capacity for disks that use 512 byte sectors (usually SATA disks, which emphasize capacity).

Aggregates have a checksum type, which is determined by the checksum type of the disks that compose the aggregate. The following configuration rules apply to aggregates, disks, and checksums: