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Checking the checksum type of spare array LUNs

If you plan to add a spare array LUN to an aggregate by specifying its name, you need to make sure that the checksum type of the array LUN you want to add is the same as the aggregate checksum type.

About this task

You cannot mix array LUNs of different checksum types in an array LUN aggregate. The checksum type of the aggregate and the checksum type of the array LUNs added to it must be the same.

If you specify a number of spare array LUNs to be added to an aggregate, by default Data ONTAP selects array LUNs of the same checksum type as the aggregate.

Note: Data ONTAP 8.1.1 and later supports a new checksum scheme called advanced zoned checksum (AZCS). Existing zoned checksum aggregates are still supported. The checksum type of all newly created aggregates using zoned checksum array LUNS is AZCS, which provides more functionality than the "version 1" zoned checksum type that was supported in previous releases and continues to be supported for existing zoned aggregates. Zoned checksum spare array LUNs added to an existing zoned checksum aggregate continue to be zoned checksum array LUNs. Zoned checksum spare array LUNs added to an AZCS checksum type aggregate use the AZCS checksum scheme for managing checksums.


  1. Check the checksum type of the spare array LUNs by entering the following command:
    For... The command is...
    7-Mode aggr status -s

    The output shows information about the spare disks or array LUNs on the system, including the checksum type of each. You can add a block checksum array LUN to a block checksum aggregate and a zoned array LUN to either a zoned aggregate or an AZCS checksum aggregate.