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4 raid configurations – Asus M2N4-SLI User Manual

Page 120

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5-16

Chapter 5: Software support

5.4

RAID configurations

The motherboard comes with the NVIDIA

®

SLI Southbridge RAID controllers

that allow you to configure IDE and Serial ATA hard disk drives as RAID

sets. The motherboard supports the following RAID configurations.
RAID 0

(Data striping) optimizes two identical hard disk drives to read and

write data in parallel, interleaved stacks. Two hard disks perform the same

work as a single drive but at a sustained data transfer rate, double that

of a single disk alone, thus improving data access and storage. Use of two

new identical hard disk drives is required for this setup.
RAID 1

(Data mirroring) copies and maintains an identical image of

data from one drive to a second drive. If one drive fails, the disk array

management software directs all applications to the surviving drive as

it contains a complete copy of the data in the other drive. This RAID

configuration provides data protection and increases fault tolerance to the

entire system. Use two new drives or use an existing drive and a new drive

for this setup. The new drive must be of the same size or larger than the

existing drive.
RAID 0+1 is

data striping and data mirroring combined without parity

(redundancy data) having to be calculated and written. With the RAID

0+1 configuration you get all the benefits of both RAID 0 and RAID 1

configurations. Use four new hard disk drives or use an existing drive and

three new drives for this setup.
RAID 5 stripes both data and parity information across three or more hard

disk drives. Among the advantages of RAID 5 configuration include better

HDD performance, fault tolerance, and higher storage capacity. The RAID 5

configuration is best suited for transaction processing, relational database

applications, enterprise resource planning, and other business systems.

Use a minimum of three identical hard disk drives for this setup.
RAID 1+0 is a striped configuration with each stripe a RAID 1 array of

drives. It combines the features of both RAID 1 and RAID 0. Fault tolerance

is provided through

mirroring while adding performance through striping.

This offers higher performance than a RAID 1 configuration but at a much

higher cost. A minimum of four hard disk drives is required for this setup.
JBOD

(Spanning) stands for Just a Bunch of Disks and refers to hard disk

drives that are not yet configured as a RAID set. This configuration stores

the same data redundantly on multiple disks that appear as a single disk on

the operating system. Spanning does not deliver any advantage over using

separate disks independently and does not provide fault tolerance or other

RAID performance benefits.