To break a mirrored volume into two volumes

Using the Windows interface

1.

Open Computer Management (Local) 

2.

In the console tree, click Disk Management.

Where?

Computer Management (Local) > Storage > Disk Management

3.

Right-click one of the volume copies in the mirrored volume, and then click Break Mirrored Volume.

Note

To open Computer Management, click Start, and then click Control Panel. Click Performance and Maintenance, click Administrative Tools, and then double-click Computer Management

You must be logged on as an administrator or a member of the Administrators group in order to complete this procedure. If your computer is connected to a network, network policy settings may also prevent you from completing this procedure. 

When you break a mirrored volume, the two volume copies that made up the mirrored volume become two independent simple volumes. These volumes are no longer fault tolerant The volume copy you click to break the mirrored volume retains the drive letter or mount point, while assigns the next available drive letter to the other volume.

Using a command line

1.

Open Command Prompt

2.

Type:

diskpart

3.

At the DISKPART prompt, type:

list volume

Make note of the number of the mirrored volume.

4.

At the DISKPART prompt, type:

select volume n

Select the mirrored volume you want to break into two separate volumes.

5.

At the DISKPART prompt, type:

list disk

Make note of the disk numbers of the mirrored volume you want to break into two separate volumes.

6.

At the DISKPART prompt, type:

break disk n

ValueDescription

list volume

Displays a list of basic and dynamic volumes on all disks.

select volume

Selects the specified volume, where n is the volume number, and shifts the focus to it. If no volume is specified, the select command lists the current volume with focus. You can specify the volume by number, drive letter, or mount point path. On a basic disk, selecting a volume also gives the corresponding partition focus.

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.

break disk n

Applies to dynamic disks only. Breaks a mirrored volume into two simple volumes. These volumes are no longer fault tolerant The disk specified by n receives the focus so you can assign it a drive letter. If the specified disk is a system or boot volume, the command fails. The other disk retains the drive letter and any mount points that belonged to the mirrored volume.

Note

To open command prompt, click Start, point to All Programs, point to Accessories, and then click Command Prompt

You must be logged on as an administrator or a member of the Administrators group in order to complete this procedure. If your computer is connected to a network, network policy settings may also prevent you from completing this procedure. 

For more information about DiskPart, see Related Topics.

Related Topics

DiskPart

Remove a mirror from a mirrored volume



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