Hitachi Compute Blade 500 Series User Manual page 241

The number of disks required varies depending on the RAID level to be
set. The following table summarizes the number of disks required.
RAID level
RAID 0 (including JBOD)
RAID 1
RAID 5
RAID 6
Note: RAID 6 with 3 hard disks and RAID 1 with 3 or more hard disks are
not supported. If you set this, the system may not operate properly.
Tip: You can select only a disk which status is "Unconfigured Good"
(unused).
To select multiple disks, click the disks while pressing Ctrl.
5 After selecting all disks to build a disk array, click Add To Array.
.
MegaRAID WebBIOS for storage expansion blades
Hitachi Compute Blade 500 Series EFI User's Guide
Table 4-13 Number of disks required
1 or more
2
3 or more
4 or more
Number of disks required
4-31