Mirror Repository Logical Drive

A mirror repository logical drive is a special logical drive in the storage subsystem created as a resource for the controller owner of the primary logical drive in a Remote Mirror . The controller stores mirroring information on this logical drive, including information about remote writes that are not yet written to the secondary logical drive . The controller can use this information to recover when the storage subsystem is powered on and off or when there is a controller reset.

When you activate the Remote Mirroring premium feature on the storage subsystem, you create two mirror repository logical drives, one for each controller in the storage subsystem. The mirror repository logical drive for a controller stores information about every Remote Mirror that contains a primary logical drive owned by this controller. An individual mirror repository logical drive is not needed for each Remote Mirror.

When you create the mirror repository logical drives, you specify placement of the logical drives. You can either use existing free capacity or you can create an array for the logical drives from unconfigured capacity and specify the RAID level.

To delete the mirror repository logical drives, use the Storage Subsystem >> Remote Mirroring >> Deactivate pull-down menu option. Deactivating the Remote Mirroring feature automatically removes the mirror repository logical drives for the storage subsystem.

Example

In the following graphic, the mirror repository logical drives for Controller A and Controller B are shown in Array 1.