User`s guide

4-17
RAID Levels
The record mode enabling the RAID feature includes several levels. Among the levels, the on-board RAID (MegaRAID
ROMB) supports the following levels; RAID 0, RAID 1, RAID 5, RAID 6, RAID10, and RAID 50. The number of
HDDs required to create a disk group varies depending on the RAID level, as shown in the table below.
Number of required HDDs
RAID level
Min. Max.
RAID 0 1 8
RAID 1 2 2
RAID 5 3 8
RAID 6 3* 8
RAID 10 4 8
RAID 50 6 8
IMPORTANT:
 To use RAID 5 or RAID 6, you need to install the optional RAID Upgrade Kit.
 To configure RAID6 using Express Setup, at least four hard disk drives of same
capacity must be installed.
NOTE: For more information on the RAID levels, see "RAID Levels" described later in
this chapter.
Disk Group
A disk group is configured with several HDDs (at least two).
The authorized number of disk groups is equal to the number of HDDs.
The figure below shows a sample configuration. The three HDDs are connected to the Internal RAID Controller
(MegaRAID ROMB), creating one disk group (DG).
HDD 1
(36 GB)
HDD 2
(36 GB)
HDD 3
(36 GB)
RAID Controller
Disk Group 0: 108 GB