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What are the disk auto assign options for a MetroCluster?

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Applies to

  • Data ONTAP 8.2 and later
  • ONTAP 9
  • MetroCluster

Answer

ONTAP 9

Dedicated pool configuration – Stack:
All disks in a stack will be assigned to 1 node and 1 pool
::> storage disk option modify -autoassign on
::> storage disk option modify -autoassign-policy stack


Dedicated pool configuration – Shelf:
All disks in a shelf will be assigned to 1 node and 1 pool. Other shelves in the same stack may be assigned to other nodes and pools.
::> storage disk option modify -autoassign on
::> storage disk option modify -autoassign-policy shelf


Manual assignment of disks:
::> storage disk option modify -autoassign off

The autoassign policy 'bay' is not available for metrocluster.
This option would assign disks to controllers based on even and odd bay numbers.

Data ONTAP 8.2

The following new option to auto-assign disks at the shelf level was introduced in Data ONTAP 8.2:
disk.auto_assign_shelf
This option allows disks to be automatically assigned with a shelf-level granularity, meaning that any unowned disks on a shelf will be assigned based on the ownership of other disks on that shelf. 

Dedicated pool configuration – Stack/Loop:
Disks in a stack/loop are assigned to only one pool.
options disk.auto_assign on
options disk.auto_assign_shelf off


Dedicated pool configuration - Shelf:
Disks in the same shelf are assigned to only one pool, but disks in the same stack/loop are shared between pools.
options disk.auto_assign on
options disk.auto_assign_shelf on


Mixed pool configuration:
Disks in the same shelf are shared between pools.
options disk.auto_assign off
options disk.auto_assign_shelf off