NEC Express5800/GT110b User's Guide Page 91

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Configuring Your Server 4-25
Virtual Disk
Virtual disk is a logical drive defined in disk group. It is recognized as a physical drive by OS. The
allowable number of virtual disks is up to 8 per disk group, or up to 8 per controller.
The figure below shows a sample configuration in which the Onboard RAID Controller (LSI
Embedded MegaRAID) is connected with two HDDs, creating one Disk Group. Two RAID1
virtual disks (VD) are defined in the Disk Group.
HDD 1
(80 GB)
HDD 2
(80 GB)
RAID Controller
DG0 160 GB
VD1-2
30GB
VD1-1
30GB
VD0-1
50GB
VD0-2
50GB
VD0 (RAID1)
50 GB
VD1 (RAID1)
30 GB
Hot-Spare
The hot-spare is prepared as an auxiliary HDD substituting for a defected HDD included in a disk
group which is configured at a redundant RAID level. Detecting a HDD fault, the system
disconnects the HDD (or makes it offline) and starts rebuild using the hot-spare.
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