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ASUS PCI-DA2100 User’s Manual 17

C. RAID Concept

RAID Concept

Appendix C: RAID Concept

RAID stands for Redundant Array of Inexpensive Drive. Some of the advantages of

using a RAID storage subsystem are:

* Provides disk spanning by weaving all connected drives into one single volume.

* Increases disk access speed by breaking data into several blocks for reading/

writing it to several drives in parallel. With RAID, storage speed increases as

more drives are added. Without RAID, the speed slows down as more drives are

installed.

* Provides fault-tolerance by mirroring or parity operation.

RAID 0

Block Striping - Data is broken into logical blocks, the size of a SCSI disk block,

and striped across several drives.

Drive 0 Drive 1 Drive 2 Drive 3 Drive 4

A0 A1 A2 A3 A4

B0 B1 B2 B3 B4

C0 C1 C2 C3 C4

D0 D1 D2 D3 D4

RAID 1

Mirroring and Striping - Copy of the same data is recorded into two set of striping

drives. In the event of failure, the duplicate set continues operation.

Set 1 Set 2

Drive 0 Drive 1 Drive 0 Drive 1

A0 A1 A0 A1

A2 A3 A2 A3

A4 B0 A4 B0

B1 B2 B1 B2

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 77 78

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