Configuring automatic ownership assignment of disks

If you have unowned disks on a stack, loop, or shelf, you can configure Data ONTAP to automatically assign disk ownership at the stack or shelf level.

Before you begin

If you have multiple loops, one disk must have been manually assigned on each loop so that automatic ownership assignment will work on each loop. Automatic disk ownership assignment must have been set up (auto option) so that the system can automatically assign any unowned disks to the same system at the stack or loop level.

About this task

For most system configurations, you can use automatic assignment at the stack or loop level; for smaller configurations, you can use automatic assignment at shelf level. The first automatic assignment occurs after 10 minutes.

You can use automatic assignment at the shelf level for the following system configurations:

Your storage system supports only one stack or loop.
You cannot assign an entire stack or loop to a single system or pool.
In a MetroCluster configuration consisting of one stack or loop for each node and two shelves, you can have one shelf for one pool and one shelf for the other pool.
On storage systems that support two controllers but only a single stack with more than one shelf.

If the disks on the same shelf have home ownership split between two systems, you need to manually assign the disks to specific shelves.

You can enable or disable automatic disk ownership assignment. When the disk.auto_assign option is on, automatic assignment at the stack or loop level is enabled. This option is the default. If you want Data ONTAP to automatically assign disk ownership at the shelf level, set on both the disk.auto_assign and disk.auto_assign_shelf options.

Steps

Decide whether you want to set up automatic ownership assignment at the stack or shelf level.

If you want to...	Then...
Configure automatic ownership assignment at the stack or loop level	Set options disk.auto_assign to on.
Configure automatic ownership assignment at the shelf level	Set options disk.auto_assign to on and options disk.auto_assign_shelf to on.
Turn off automatic ownership assignment	Set options disk.auto_assign to off and options disk.auto_assign_shelf to off. Note that if you set disk.auto_assign_shelf to on while disk.auto_assign is set to off, automatic assignment does not occur.

For example, you have a shelf whose disks are owned by one system and another shelf on the same loop whose disks are owned by a different system. In this case, you would configure automatic ownership assignment at the shelf level.

Data ONTAP automatically assigns unowned disks on the stack, loop, or shelf, depending on the option settings.

Verify the automatic assignment settings for the disks: disk show -o owner_name -v