NEC Express5800/iR120a-1E, User Manual, Page: 104 / 378

4-28 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 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.
„
3.5-inch disk model
Number of required HDDs
RAID level
Min. Max.
RAID 0 1 4
RAID 1 2 2 (or 4 when configuring 2 sets of RAID 1 disk groups)
RAID 10 4 4
„
2.5-inch disk model
Number of required HDDs
RAID level
Min. Max.
RAID 0 1 6
RAID 1 2 2 (or 6 when configuring 3 sets of RAID 1 disk groups)
RAID 10 4 4
NOTES:
„
For details of the RAID levels, see "RAID Levels" described later in
this chapter.
„
If five or six hard disk drives are installed in 2.5-inch hard disk
drive model, only four of them will be shown on POST or BIOS
SETUP menu. Use the RAID utility to know the actual number of
hard disk drives installed.
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 the Onboard
RAID Controller (LSI Embedded MegaRAID

), creating one disk group (DG).
HDD 1
(80 GB)
HDD 2
(80 GB)
RAID Controller
Disk Group 0: 160 GB