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How automatic ownership assignment works for disks

If your configuration follows some basic rules to avoid ambiguity, Data ONTAP can automatically assign ownership and pool membership for disks.

Automatic disk autoassignment uses the configured autoassignment policy to determine the correct ownership for disks. The autoassignment policy can be stack, shelf, bay, or default. In most cases, all disks in a stack (or loop) can be assigned to the same node and pool.

For mid- and high-end platforms, the default autoassignment policy is equivalent to the stack policy. For entry-level platforms (FAS2xxx), the default autoassignment policy is equivalent to the bay policy, which supports two controllers sharing the same shelf. For this policy, disks in odd bay numbers are assigned together, and disks in even bay numbers are assigned together.

For partitioned disks, autoassignment operates on the container disk and also both of the partitions.

If you decide to change the way Data ONTAP has assigned the disks, you can do so at any time. You can also change autoassignment to use a different assignment policy, although doing so does not affect currently assigned disks.

If you need to temporarily remove disk ownership for one or more disks while you perform an administrative task, you must disable automatic ownership assignment first to prevent Data ONTAP from immediately reassigning ownership for those disks.

Automatic ownership assignment is not available for array LUNs or virtual disks.