Hitachi 220H Bios Manual page 131

4. The following window is displayed.
Check Change RAID Level and Add Drive, select the physical drives used
for adding capacity from the list below, and then click Go.
To select multiple drives, click the drives while pressing Ctrl key.
5. The following window is displayed. Click Yes.
Hitachi Compute Rack 210H/220H BIOS Guide
MegaRAID WebBIOS 2-67