Disk resizing and mirroring

Use disk resize only when mirroring is permanently disabled. If you try to run disk resize on a device that is mirrored, you see:

disk resize can proceed only when mirroring is permanently disabled. Unmirror secondary with mode = 'remove' and re-execute disk resize command.

When mirroring is only temporarily disabled, two scenarios can arise:

• The primary device is active while the secondary device is temporarily disabled and produces the same error as shown above.

• The secondary device is active while the primary device is temporarily disabled and produces an error with this message;

  disk resize can proceed only when mirroring is permanently disabled. Unmirror primary with mode = 'remove' and re-execute the command.
  

To increase the size of a mirrored device:

1. Permanently disable mirroring on the device.

2. Increase the size of the primary device.

3. Physically remove the mirror device (in case of file).

4. Reestablish mirroring.