NEC SigmaBlade AD106a Guía de usuario descargar pdf (Pagina 48)

4-4 Configuring Your Storage and I/O Blade

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 Internal RAID Controller is connected

with three HDDs, creating one Disk Group. Two RAID5 virtual disks (VD) are defined in the Disk

Group.

HDD 1

(36 GB)

HDD 2

(36 GB)

HDD 3

(36 GB)

RAID Controller

DG0 108 GB

VD1-3

16 GB

VD1-2

16 GB

VD1-1

16 GB

VD0-1

20GB

VD0-2

20GB

VD0-3

20GB

VD0 (RAID5)

40 GB

VD1 (RAID5)

32 GB

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 logical

drive 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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NEC SigmaBlade AD106a Guía de usuario Pagina 48