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== Creating a Mirrored (RAID 1) Set using Disk Management ==
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The remainder of this chapter assumes that the disks in question have been converted from basic disks to dynamic disks. For details on performing this task refer to the initial sections of [[Creating and Managing Simple and Spanned Volumes on Windows Server 2008 R2]].
A mirror may be added to an existing volume using either the Disk Management snap-in, or from the command-prompt using the ''diskpart'' tool. When a mirror is added to an existing volume Windows creates a second volume equal in size and file system type on a second disk of your choice and copies (a process also known as ''resynching'') the data on the existing volume to the mirror.
To mirror to an existing volume using Disk management, right click on the existing volume in the graphical view and select ''Add Mirror'' to invoke the Add Mirror dialog shown below:
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[[Image:windows_server_2008_add_mirror.jpg|Adding a mirror to an existing volume on Windows Server 2008 R2]]
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At this point Windows Server 2008 R2 will begin the resynching process which, depending on the size of the volume being mirrored may take some time. This fact is reported by the show volume command which lists the volume as being of type Mirror with a status of Rebuild. Once the resynching process is complete the status will be displayed as Healthy.
== Breaking and Removing Mirrored Sets ==