Virtual Disk - NEC Express5800 User Manual

4-36 Configuring Your Server

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 RAID5 virtual
disks (VD) are defined in the Disk Group.
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.
RAID Controller
VD0-1
50GB
VD1-1
30GB
HDD 1
(80 GB)
DG0 160 GB
VD0 (RAID1)
VD0-2
50 GB
50GB
VD1-2
VD1 (RAID5)
30GB
30 GB
HDD 2
(80 GB)