Raid Levels; Disk Group - NEC N8100-1668F User Manual

4-38 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 Optional
RAID Controller supports RAID levels 0, 1, 5, 6, 10, and 50. 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 5
RAID 6
RAID 10
RAID 50
* To configure RAID6 using Express Setup, at least four hard disk drives of
same capacity must be installed.
IMPORTANT:
Controller. Choose a RAID Controller appropriate to RAID system you
are configuring.
NOTE:
later in this chapter.

Disk Group

A disk group is configured with more than one hard disk drives.
The allowable number of disk groups is equal to the number of hard disk drives.
The figure below shows a sample configuration. The three hard disk drives are connected to the
Onboard RAID Controller (LSI Embedded MegaRAID) or Optional RAID Controller, creating
one disk group (DG).
HDD 1
(36 GB)
Number of required hard disk drives
Min.
1
2
3
3*
4
6
The supported RAID level depends on the RAID
For details of the RAID levels, see "RAID Levels" described
RAID Controller
HDD 2
(36 GB)
Max.
8
2
8
8
8
8
Disk Group 0: 108 GB
HDD 3
(36 GB)