Dell PowerVault DP500 - Manual (Page 36)

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RAID and Disk Management
Working With Mirrors
A mirrored volume duplicates your data to two physical disks. A mirror
provides data redundancy by simultaneously writing the same data to two
separate volumes that reside on different disks. If one of the disks fails, data
continues to be written to and read from the unaffected disk.
This section discusses how to add, remove, or break a mirror.
Adding a Mirror
1 Launch the Disk Management utility.
2 In the graphical view pane, right-click the volume you want to add a mirror
to and click Add Mirror.
3 Select the disk you want to use to create the mirror and click Add Mirror.
Removing a Mirror
Removing a mirror from a volume removes or destroys the data from the
selected mirror and leaves the other mirror intact. After you remove a mirror,
the space on the disk used by the removed mirrored volume becomes unallocated
space. The remaining volume becomes a simple volume on the disk.
To remove a mirror, perform the following steps:
1 Launch the Disk Management utility.
2 In the graphical view pane, right-click the volume you want to remove the
mirror and click Remove Mirror.
3 Select the disk you want the mirror removed from and click Remove Mirror.
Breaking a Mirror
Breaking a mirror creates two simple volumes with individual drive letters. Each
volume contains the data on the mirror at the time the mirror was broken.
The data is no longer redundant, but it remains intact.
To break a mirror, perform the following steps:
1 Launch the Disk Management utility.
2 In the graphical view pane, right-click the volume for which you want to
break the mirror, and click Break Mirrored Volume.
A confirmation message appears.
3 Click Yes to confirm.