Raid Levels; Disk Group - NEC Express5800/B120a User Manual

4-24 Configuring Your Server

RAID Levels

The record mode enabling the RAID feature includes several levels. N8403-027 SATA interface
card and N8403-026 RAID Controller support RAID levels 0 and 1. 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
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 two HDDs are connected to N8403-027 SATA
interface card or N8403-026 RAID Controller, creating one disk group (DG).
Number of required HDDs
Min.
1
2
For details of the RAID levels, see "RAID Levels" described
RAID Controller
HDD 1
(36 GB)
Max.
2
2
DG 0: 72 GB
HDD 2
(36 GB)