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RAID SYSTEM CONFIGURATION
This section describes how to use the internal hard disk drives as a RAID System using the Onboard RAID Controller
(MegaRAID ROMB).
For more information about the optional RAID Controller, refer to the documents provided with the optional RAID
Controller.
RAID
Overview of the RAID System
What is RAID (Redundant Array of Inexpensive Disks)?
RAID is an abbreviation for "Redundant Array of Inexpensive Disks". The RAID technology allows several hard disk
drives (HDD) to be handled collectively.
RAID can configure several HDDs as a single array (disk group) to operate the HDDs effectively. This can bring higher
performance than a single HDD of a large capacity.
The Onboard RAID Controller (MegaRAID ROMB) allows to divide a single disk group into several logical drives.
The Onboard RAID Controller (MegaRAID ROMB) recognizes these virtual disks as if they were a single HDD. The
Onboard RAID Controller (MegaRAID ROMB) can access in parallel several HDDs configuring a disk group.
Some RAID levels can recover data from the remaining data and parity by using a rebuild feature if an error occurs in a
single HDD. This provides high reliability for the system.
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.
RAID level
RAID 0
RAID 1
RAID 5
RAID 6
RAID 10
RAID 50
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 authorised 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 Onboard RAID Controller
(MegaRAID ROMB), creating one disk group (DG).
Number of required HDDs
Min.
Max.
1
8
2
2
3
8
3
8
4
8
6
8
4-35
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