Two methods for creating a mirror

You can create a mirror on an existing volume or create a new mirrored volume.

For details, see the following:

Note:

The mirroring process is disabled if the volume cannot be mirrored or if there is no unallocated space on another dynamic disk large enough to mirror the volume. A RAID-5 volume cannot be mirrored.

More Information

Add a mirror to a volume

About creating dynamic volumes