Lenovo ThinkServer RD240 Software User's Manual page 101

RAID 6 is best suited for networks that perform a lot of small input/output
(I/O) transactions simultaneously. It provides data redundancy, high read
rates, and good performance in most environments.
In the case of a failure of one drive or two drives in a virtual drive, the
RAID controller uses the parity blocks to recreate all of the missing
information. If two drives in a RAID 6 virtual drive fail, two drive rebuilds
are required, one for each drive. These rebuilds do not occur at the same
time. The controller rebuilds one failed drive, and then the other failed
drive.
When you select Manual Configuration and click Next, the drive Group
Definition screen appears. You use this screen to select drives to create
drive groups.
1. Hold <Ctrl> while selecting at least three ready drives in the Drives
panel on the left.
2. Click Add To Array to move the drives to a proposed drive group
configuration in the Disk Groups panel on the right, as shown in
Figure 4.10.
If you need to undo the changes, click the Reclaim button.
Creating a Storage Configuration 4-25