Removing the Mirror Relationship Between Two Logical Drives

Use the Remove Mirror Relationship option to remove the mirror relationship between the two in a relationship.

Keep these guidelines in mind before performing the procedures:

• This option is not available unless defined mirror relationships exist on the .
• This option does not delete the , , or the that support mirroring for the storage subsystems. Data on the logical drives is not affected. As a result of this operation, the primary logical drive and secondary logical drive become standard, -accessible, non-mirrored logical drives.
• This option is only available for the local logical drive (primary or secondary) that is present in the storage subsystem that you are currently managing. This option is not available if you select a remote secondary logical drive in the Logical pane.
• The mirror relationship is first removed on the local storage subsystem and on the remote storage subsystem. Sometimes, the mirror relationship is successfully removed on the local storage subsystem but cannot be removed on the remote storage subsystem because of a communication problem. In this case, an error message appears, which shows:
  • The name of the remote storage subsystem with the orphaned mirrored logical drive
  • The name of the logical drive
  To resolve the problem, open the Subsystem Management Window for the remote storage subsystem, select the specified logical drive, and remove the mirror relationship.
  • Sometimes, the mirror relationship was successfully removed on the secondary side, but not the primary side. In this case, the first I/O write to the primary logical drive causes the mirror state to change to. The Logical pane of the primary Subsystem Management Window also shows an unresponsive remote secondary logical drive, which is represented by the icon Remove the mirror relationship on the primary storage subsystem to correct the problem.
  • Sometimes, the mirror relationship was successfully removed on the primary side, but not on the secondary side. In this case, there is no change to the representation of the secondary logical drive in the secondary Logical pane in the Subsystem Management Window. Remove the mirror relationship on the secondary storage subsystem to correct the problem, and make the logical drive accessible by hosts.

Removing the Mirror Relationship Between Two Logical Drives

1. In the Logical pane, select a primary or secondary logical drive in the Logical pane (whichever is local), and select Logical Drive >> Enhanced Remote Mirroring >> Remove Mirror Relationship .
2. In the Select one or more mirrored pairs list box, select the mirrored logical drive pairs for which you want to remove the mirror relationship.
3. Click OK.
4. Click Yes.The Remove Mirror Relationship - Progress dialog appears. When the mirror relationship is removed, the logical drives in the mirrored pairs that you selected are no longer part of a mirrored pair. All data on the logical drives remains intact and available. Logical Drives that were the secondary logical drive in the mirrored pair are now accessible by hosts that are mapped to them.

Example of Removing the Mirror Relationship Between Two Logical Drives

After using the Remove Mirror Relationship option, the logical drive Accounting figure appears as a standard, non-mirrored logical drive in the Logical pane in the following figure. As shown in the figure, the (former) secondary logical drive Accounting2, from a remote storage subsystem, no longer appears.

Related Links:

• Learn About Enhanced Remote Mirroring
• Activate Enhanced Remote Mirroring Wizard
• Learn About Missing Logical Drives