NEC SigmaBlade B140a-T Betriebsanweisung Seite 82

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4-30 Configuring Your Server
RAID Levels
The record mode enabling the RAID feature includes several levels. Among the levels, the Onboard
RAID Controller (MegaRAID ROMB) supports RAID levels 0, 1, and 5. The number of hard disk
drives required to create a disk group varies depending on the RAID level as shown in the table
below.
Number of required HDDs
RAID level
Min. Max.
RAID 0 1 4
RAID 1 2 2
RAID 5 3 4
NOTE: For details of the RAID levels, see "RAID Levels" 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.
The figure below shows a sample configuration. The three HDDs are connected to the Onboard
RAID Controller (MegaRAID ROMB), creating one disk group (DG).
HDD 1
(36 GB)
HDD 2
(36 GB)
HDD 3
(36 GB)
RAID Controller
Disk Group 0: 108 GB
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