Virtual Disk - NEC N8100-1573F User Manual

4-28 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 16 per disk group, or up to 64 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.
Parity
The parity means redundant data. A single set of redundant data is created from the data saved in
more than one HDD.
The created redundant data is used for data recovery when a HDD is defected.
Hot-Swap
The hot-swap enables a HDD to be removed (or replaced) under system operation.
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
50 GB
VD1-1
30 GB
HDD 1
(80 GB)
DG0 160 GB
VD0 (RAID1)
VD0-2
50 GB
50 GB
VD1-2
VD1 (RAID1)
30 GB
30 GB
HDD 2
(80 GB)