NEC N8100-1220F, User Manual

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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
NOTE:
For details of the RAID levels, see "RAID Levels" described
later in this chapter.
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