Lenovo ThinkServer RD240 Software User's Manual page 259

Figure 8.3 Create Virtual Drive Screen
3. Select the RAID level desired for the virtual drive.
When you use simple configuration, the RAID controller supports
RAID levels 1, 5, and 6. In addition, it supports independent drives
(configured as RAID 0). The screen text gives a brief description of
the RAID level that you select. The RAID levels that you can choose
depend on the number of drives available. To learn more about RAID
levels, see Chapter 2, "Introduction to RAID."
4. Click the box next to Assign a hot spare if you want to assign a hot
spare drive to the virtual drive.
Hot spares are drives that are available to replace failed drives
automatically in a redundant virtual drive (RAID 1, RAID 5, or
RAID 6).
Creating a New Storage Configuration 8-7