NEC Express5800 120Rj-2 User Manual page 84

User Guide
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 Internal RAID Controller supports RAID levels 0, 1, 5, and 6. The number
of hard disk drives required to create a disk group varies depending on the RAID level
as shown in the table below.
To use RAID 5 or RAID 6 with the Internal RAID Controller, you
need to install the optional RAID Upgrade Kit.
described 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.
Table 22: RAID levels
RAID level Number of required HDDs
Min.
RAID 0 1
RAID 1 2
RAID 5 3
RAID 6 3
Note:For details of the RAID levels, see "RAID Levels"
Max.
8
2
8
8
Caution
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