NEC Express 5800 User Manual page 322

Hardware
RAID Levels
The record mode enabling the RAID feature includes several levels. Among the levels, the
Intelnal 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.
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 Internal
RAID Controller, creating one disk group (DG).
RAID level
RAID0
RAID1
RAID5
RAID6
RAID10
RAID50
NOTE:
For details of the RAID levels, refer to "RAID Levels" described
later in this chapter.
Number of required HDDs
Min.
1
2
3
3
4
6
322
Max.
8
2
8
8
8
8