Raid Levels; Disk Group - NEC Express5800 User Manual

4-24 Configuring Your Server

RAID Levels

The record mode enabling the RAID feature includes several levels. Among the levels, the Onboard
RAID Controller (LSI Embedded MegaRAID™) supports RAID levels 0, 1, and 10. The number of
hard disk drives 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 10
NOTE:
later in this chapter.

Disk Group

A disk group is configured with more than one HDDs.
The allowable 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 (LSI Embedded MegaRAID™), creating one disk group (DG).
Number of required HDDs
Min.
1
2
4
For details of the RAID levels, see "RAID Levels" described
RAID Controller
HDD 1
(80 GB)
Max.
4
2
4
Disk Group 0: 160 GB
HDD 2
(80 GB)