Lenovo ThinkServer RD240 Software User's Manual page 170

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2. Click Virtual Drives.
3. When the Virtual Drive screen appears, select Migration only (and
skip to step 6) or Migration with addition in the right panel.
4. If you selected Migration with addition, select one or more drives
from the small window in the lower right of the screen.
5. Select a new RAID level from the drop-down menu on the right.
The available RAID levels are limited, based on the current RAID
level of the virtual drive plus the number of drives available.
6. When you have made your selections, click Go at the bottom of the
right panel.
7. When the message appears, confirm that you want to migrate the
RAID level of the virtual drive.
A reconstruction operation begins on the virtual drive. You must wait until
the reconstruction is completed before you perform any other tasks in the
WebBIOS CU.
WebBIOS Configuration Utility