NEC Express5800/320Lb User Manual page 359

TIPS:
Disks 1 and 4, and between Disks 2 and 5.
The figure below shows Drive (E) in [View Disk] tab of Volume. Appearance is the same in other
stripe volumes. The volume type is dynamic mirror stripe volume.
The next procedure is to perform recovery when Disk 2 fails in the above environment.
Check disks.
1.
If a failure occurs on a disk that includes a mirror volume, the volume will show
[Degenerate] status. Its disk name will change to [Unknown Disk] and "x" will appear
on its disk icon. "!" will appear on the failed disk and on the stripe volume disk.
If you click [View Disk] tab of [Unknown Disk], "!" marks are placed on each volume to
indicate that a redundancy failure occurred.
In this example, assume that target IDs are the same between
System Upgrade 8-23