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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.
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.
Disk array controller
Channel 1
(Port 1)
Channel 2
(Port 2)
Channel 3
(Port 3)
Channel 4
(Port 4)
Logical drive 1
LD
LD
LD
Spare
LD
Spare :
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
For the
Check