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4 raid configurations, 1 raid definitions – Asus P5B-E Plus User Manual

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5-28

Chapter 5: Software support

5.4

RAID configurations

The motherboard comes with the following RAID resolutions:

Intel

®

ICH8R Southbridge RAID controller that allow you to configure IDE

and Serial ATA hard disk drives as RAID sets. The motherboard supports the

following RAID 0, 1, 5, 10.

JMicron

®

RAID controller allows you to configure RAID 0, RAID 1 and JBOD

sets on the external Serial ATA hard disk drives.

5.4.1

RAID definitions

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.
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.