Nec Disk Array Controller N8103-89 Manuel d'utilisateur télécharger pdf (Page 90)

1-3. Logical Drive

A logical drive is configured with a group of more than one HDD. It is recognized as a

physical drive by OS. Up to eight logical drives are permitted by the card when four HDDs

are installed in the server.

The figure below shows a sample configuration in which the disk array controller is

connected with four HDDs, three of which create a logical drive and the remaining HDD is

set to a single hot-spare disk.

LD x-x : HDDs assigned to

logical drive

Spare : Hot-spare disk

Spare

LD 1-3

LD 1-1

LD 1-2

Disk array controller

Logical drive 1

Channel 1

(Port 1)

Channel 3

(Port 3)

Channel 2

(Port 2)

Channel 4

(Port 4)

1-4. 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.

1-5. Hot-Swap

The hot-swap enables a HDD to be removed (replaced) under system operation.

Check

For the hot-swap with the card, an additional HDD cage must be connected

to the card.

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Nec Disk Array Controller N8103-89 Manuel d'utilisateur Page 90