Reactivate a mirrored volume

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

To reactivate a mirrored volume

If the I/O errors are transient, you can try to reactivate the disk.

Open Computer Management (Local).
In the console tree, click Computer Management (Local), click Storage, and then click Disk Management.
Right-click the partially failed disk, and then click Reactivate Disk.

The mirrored volume's status should change to Regenerating, then Healthy.

If the disk containing part of the mirrored volume does not return to Healthy status, see Replace a failed mirror with a new mirror on another disk.

Notes

To perform this procedure on a local computer, you must be a member of the Backup Operators group or Administrators group on the local computer, or you must have been delegated the appropriate authority. To perform this procedure remotely, you must be a member of the Backup Operators group or Administrators group on the remote computer. If the computer is joined to a domain, members of the Domain Admins group might be able to perform this procedure. As a security best practice, consider using Run as to perform this procedure. For more information, see Default local groups, Default groups, and Using Run as.
To open Computer Management, click Start, click Control Panel, double-click Administrative Tools, and then double-click Computer Management.

Open Command Prompt.
Type:

diskpart
At the DISKPART prompt, type:

list disk

Make note of the disk number for the disk with Offline status.
At the DISKPART prompt, type:

select diskn

Select the disk with Offline status.
At the DISKPART prompt, type:

online

Value	Description
list disk	Displays a list of disks and information about them, such as their size, amount of available free space, whether the disk is a basic or dynamic disk, and whether the disk uses the master boot record (MBR) or GUID partition table (GPT) partition style. The disk marked with an asterisk (*) has focus.
select disk	Selects the specified disk, where n is the disk number, and gives it focus.
online	Brings an offline disk or volume with focus online.

Notes

To perform this procedure on a local computer, you must be a member of the Backup Operators group, Administrators group, or you must have been delegated the appropriate authority. If the computer is joined to a domain, members of the Domain Admins group might be able to perform this procedure. As a security best practice, consider using Run as to perform this procedure. For more information, see Default local groups, Default groups, and Using Run as.
To open a command prompt, click Start, point to All programs, point to Accessories, and then click Command prompt.
For more information about DiskPart, see Related Topics.

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