create volume mirror

Applies to: Windows Server (Semi-Annual Channel), Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, Windows Server 2012

Creates a volume mirror by using the two specified dynamic disks. After the volume has been created, the focus automatically shifts to the new volume.


create volume mirror [size=<n>] disk=<n>,<n>[,<n>,...] [align=<n>] [noerr]


Parameter Description
size=<n> Specifies the amount of disk space, in megabytes (MB), that the volume will occupy on each disk. If no size is given, the new volume takes up the remaining free space on the smallest disk and an equal amount of space on each subsequent disk.
disk=<n>,<n>[,<n>,...] Specifies the dynamic disks on which the mirror volume is created. You need two dynamic disks to create a mirror volume. An amount of space that is equal to the size specified with the size parameter is allocated on each disk.
align=<n> Aligns all volume extents to the closest alignment boundary. This parameter is typically used with hardware RAID logical unit number (LUN) arrays to improve performance. <n> is the number of kilobytes (KB) from the beginning of the disk to the closest alignment boundary.
noerr For scripting only. When an error is encountered, DiskPart continues to process commands as if the error did not occur. Without this parameter, an error causes DiskPart to exit with an error.


To create a mirrored volume of 1000 megabytes in size, on disks 1 and 2, type:

create volume mirror size=1000 disk=1,2

Additional References