Use this option to perform a role reversal between the two paired logical drives in a Remote Mirror. This option demotes a selected primary logical drive to become the secondary logical driveof the mirrored pair. If the associated secondary logical drive can be contacted, the secondary logical drive is automatically promoted to be the primary logical drive. Use this option for role reversals during normal operating conditions. You can also use this option during a Recovery Guru procedure for a Dual PrimaryRemote Mirror status condition.
Important:
Any hosts that are accessing the primary logical drive through a logical drive-to-LUN mapping will no longer be able to read or write to the logical drive. When the primary logical drive becomes a secondary logical drive, only remote writes initiated by the primary controller will be written to the logical drive.
If a communication problem between the primary and secondary sites prevents the promotion of the secondary logical drive, an error message is displayed. However, you are given the opportunity to proceed with the demotion of the primary logical drive, even though this will lead to a Dual SecondaryRemote Mirror status condition. For more information, see Forcing a Primary Logical Drive to Change to a Secondary Logical Drive.
This option is not available unless the Remote Mirroring premium feature has been activated.
If the selected primary logical drive has associated FlashCopy logical drives, demoting this logical drive to a secondary role will cause the associated FlashCopy logical drives to fail.
Procedure
1
Select the primary logical drive in the Logical View, then, select either the Logical Drive >> Remote Mirroring >> Change >> Role to Secondary pull-down menu option, or Change >> Role to Secondary from the right-mouse pop-up menu.
Result: The Change to Secondary dialog is displayed.
2
Select Yes.
Results:
The primary logical drive is demoted to be the secondary logical drive in the Remote Mirror.
If the controller owner of the secondary logical drive can be contacted, the secondary logical drive is automatically promoted to be the primary logical drive in the Remote Mirror.
Example
The above example of a Logical View shows the Primary Logical Drive Accounting and the Secondary Logical Drive Accounting 2, from a remote storage subsystem.
After selecting the Primary Logical Drive Accounting and using the Change >> Role to Secondary option, the logical drive Accounting is displayed as a secondary logical drive in the Logical View. The (former) Secondary Logical Drive Accounting 2, from a remote storage subsystem, is now the primary logical drive of the Remote Mirror and is no longer displayed in the Subsystem Management Window for Storage Subsystem East.