Raid Configurations; Raid Definitions - Asus P5E3 Premium WiFi-APn User Manual

5.4

RAID configurations

The motherboard comes with two RAID controllers that allow you to configure
Serial ATA hard disk drives as RAID sets.
The Intel ® ICH9R Southbridge RAID includes a high performance SATA
•
RAID controller that supports RAID 0, RAID 1, RAID 10, and RAID 5 for six
independent Serial ATA channels.
The JMicro JMB363 RAID includes a high performance SATA RAID controller
• ®
that supports RAID 0, 1, and JBOD for two independent Serial ATA channels.
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 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 10 is data striping and data mirroring combined without parity (redundancy
data) having to be calculated and written. With the RAID 10* 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.
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.
Intel Matrix Storage. The Intel® Matrix Storage technology supported by the
®
ICH9R chip allows you to create a RAID 0, RAID 1, RAID 5, and RAID 10* function
to improve both system performance and data safety. You can also combine two
RAID sets to get higher performance, capacity, or fault tolerance provided by the
difference RAID function. For example, RAID 0 and RAID 1 set can be created by
using only two identical hard disk drives.
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