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Lesson 4Recover Failed Mirror Volume
ObjectiveRecover failed Mirror Volume of varied status.

Recover Failed Mirror Volume

When one member of a mirrored volume fails, the other member continues to operate, but is no longer fault-tolerant. To prevent potential data loss, you must recover the mirrored volume as soon as possible.
The status of the failed volume appears in Disk Management as Failed Redundancy, and one of the disks will appear as Offline, Missing, or Online (Errors). The method that you use to recover the mirrored volume depends on the status of the disk.
To recover a mirrored volume if the disk status is either Offline or Missing, perform the following steps:
Recovering a failed mirrored volume on a disk identified as Offline or Missing:
Ensure that the disk is attached to the computer and has power. In Disk Management, right-click the disk that is identified as Missing or Offline, and then click Reactivate Disk. The status of the disk should return to Healthy and the mirrored volume should regenerate automatically.

1) Recover Desktop and LAMP

Recovering a failed mirrored volume on a disk identified as Online (errors):

To recover a mirrored volume if the disk status is Online (Errors), in Disk Management, right-click the disk, and then click Reactivate Disk. The status of the volume should return to Healthy and the mirrored volume should regenerate automatically.
Recovering a failed mirrored volume on a disk identified as online (errors)
Recovering a failed mirrored volume on a disk identified as online (errors)

Replacing a disk and creating a new mirrored volume:

If the preceding procedures fail to reactivate the disk or if the status of the volume does not return to Healthy, you must replace the failed disk and create a new mirrored volume.
To create a new mirrored volume, perform the following steps:
In Disk Management, right-click the mirrored volume on the failed disk, and then click Remove Mirror. In the Remove Mirror dialog box, click the failed disk, and then click Remove Mirror. Click Yes when prompted to confirm your choice. Right-click the volume that you want to mirror, and then click Add Mirror. Select the second disk in the mirrored volume, and then click OK.
Replacing a disk and creating a new mirrored volume
Replacing a disk and creating a new mirrored volume

Mirror a Volume

In the following Simulation, you will mirror a volume to help to ensure the availability of data on a critical system.
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Configure Mirrored Volumes Note:If a disk continues to appear as Online (Errors), it may be about to fail. You should replace the disk as soon as possible.
The next lesson demonstrates how to recover a failed RAID-5 volume.