NEC N8103-89 用户手册
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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.
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.
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.
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.
to the card.