Lenovo ThinkServer RD240 Software User's Manual page 114

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RAID 10 provides both high data transfer rates and complete data
redundancy. It works best for data storage that must have 100 percent
redundancy of RAID 1 (mirrored drive groups) and that also needs the
enhanced I/O performance of RAID 0 (striped drive groups); it works well
for medium-sized databases or any environment that requires a higher
degree of fault tolerance and moderate to medium capacity.
When you select Manual Configuration and click Next, the Disk Group
Definition screen appears.
You use the Drive Group Definition screen to select drives to create drive
groups.
1. Hold <Ctrl> while selecting two ready drives in the Drives panel on
the left.
2. Click Add To Array to move the drives to a proposed two-drive drive
group configuration in the Drive Groups panel on the right.
If you need to undo the changes, click the Reclaim button.
3. Click Accept DG to create a RAID 1 drive group.
An icon for the next drive group displays in the right panel.
4. Click on the icon for the next drive group to select it.
5. Hold <Ctrl> while selecting two more ready drives in the Drives panel
to create a second RAID 1 drive group with two drives.
6. Click Add To Array to move the drives to a second two-drive drive
group configuration in the Drive Groups panel, as shown in
Figure 4.20.
If you need to undo the changes, click the Reclaim button.
Note: RAID 10 supports a maximum of eight spans, with a
maximum of 32 drives per span. (Other factors, such as the
type of controller, can limit the number of drives.) You must
use an even number of drives in each RAID 10 drive group
in the span.
WebBIOS Configuration Utility