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Configuring Your Server 4-35
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, and RAID 5. 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
13
RAID 1
2
2
RAID 5
3
13
Spanning of RAID 1
4
4
Spanning of RAID 5
6
12
NOTES:
For details of the RAID levels, see "RAID Levels" described later in
this chapter.
If an additional HDD cage N8154-13 is installed, up to 13 hard disk
drives can be installed in the server.
Disk Group
A disk group is configured with more than one HDDs.
Up to five disk groups are permitted by the on-board RAID (MegaRAID ROMB) when five HDDs
are installed in the server.
The figure below shows a sample configuration. The three HDDs are connected to the on-board
RAID (MegaRAID ROMB), creating one disk group (DG).
HDD 1
(36 GB)
HDD 2
(36 GB)
HDD 3
(36 GB)
Disk array controller
Disk Group 0: 108 GB
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