ASUS PCI-DA2100 User’s Manual
17
C. RAID Concept
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
