3-1
ASUS PCI-DA2200 User’s Manual
Chapter 3
Functional Description
The advantages of RAID are: Availability, Capacity and Performance.
Choosing the right RAID level and drive failure management can
increase Availability, subsequently increasing Performance and
Capacity. The ASUS PCI-DA2200 RAID controller provides complete
RAID functionality and enhanced drive failure management.
3.1
RAID Management
RAID stands for Redundant Array of Independent Drives. 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
when reading/writing to several drives in parallel. With RAID,
storage speed increases as more drives are added.
•
Provides fault-tolerance by mirroring or parity operation.
What are the RAID levels?
RAID
Level
Description
Minimum
Drives
Data
Availability
Performance
Sequential
Performance
Random
NRAID Non-RAID
1
Drive
Drive
RAID 0 Disk Striping
N
==NRAID
R: Highest
W: Highest
R: High
W: Highest
RAID 1
(0+1)
Mirroring Plus
Striping (if N>1)
N+1
>>NRAID
==RAID 5
R: High
W: Medium
R: Medium
W: Low
RAID 3 Striping with Parity
on dedicated disk
N+1
>>NRAID
==RAID 5
R: High
W: Medium
R: Medium
W: Low
RAID 5 Striping with
interspersed parity
N+1
>>NRAID
==RAID 5
R: High
W: Medium
R: High
W: Low