Use this option to perform a role reversal between the two paired logical drives in a Remote Mirror. This option promotes a selected secondary logical drive to become the primary logical driveof the mirrored pair. If the associated primary logical drive can be contacted, the primary logical drive is automatically demoted to be the secondary logical drive. Use this option when a catastrophic failure has occured to the storage subsystem that contains the primary logical drive and you want to promote the secondary logical drive so that hosts can access data and business operations can continue.
Important:
When the secondary logical drive becomes a primary logical drive, any hosts that are accessing the logical drive through a logical drive-to-LUN mapping will now be able to read or write to the logical drive.
If a communication problem between the secondary and primary sites prevents the demotion of the primary logical drive, an error message is displayed. However, you are given the opportunity to proceed with the promotion of the secondary logical drive, even though this will lead to a Dual Primary Remote Mirror status condition. For more information, see Forcing a Secondary Logical Drive to Change to a Primary Logical Drive.
This option is not available unless the Remote Mirroring premium feature has been activated.
Procedure
1
Select the secondary logical drive in the Logical View, then, select either the Logical Drive >> Remote Mirroring >> Change >> Role to Primary pull-down menu option, or Change >> Role to Primary from the right-mouse pop-up menu.
Result: The Change to Primary dialog is displayed.
2
Select Yes.
Results:
The secondary logical drive is promoted to be the primary logical drive in the Remote Mirror.
If the controller owner of the primary logical drive can be contacted, the primary logical drive is automatically demoted to be the secondary logical drive in the Remote Mirror.
Example
The above example of a Logical View shows the Secondary Logical Drive Accounting that is present in Storage Subsystem East.
After selecting the Secondary Logical Drive Accounting and using the Change >> Role to Primary option, the logical drive Accounting is displayed as a primary logical drive in the Logical View. The Secondary Logical Drive Accounting 2, from a remote storage subsystem, is displayed as a child node of the Primary Logical Drive Accounting node in the Subsystem Management Window.