Asus RS162-E4/RX4 - Manual (Page 114)

Chapter 6: RAID configuration -
6.1 Setting up RAID
The motherboard comes with LSI 1068 PCI-X SAS chipset that allows you
to set RAID 0, RAID 1, RAID 0+1 and RAID 1E configurations.
6.1.1 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 1-E (Enhanced RAID 1) has a striped layout with each stripe unit
having a secondary (or alternate) copy stored on a different disk. You can
use three or more hard disk drives for this configuration.
If you want to boot the system from a hard disk drive included in a
created RAID set, copy first the RAID driver from the support CD to a
floppy disk before you install an operating system to the selected hard
disk drive. Refer to Chapter 7 for details.