Asus KCMR-D12 User Manual download pdf (Page 99)

ASUS KCMR-D12 5-3

5.1 Setting up RAID

5.1.1 RAID denitions

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 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.

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.

SPAN

helps to combine the capacity of multiple physical disk drives into one single

large drive volume, making the small-sized disk drives more useful. The disk drives

in this mode need not to be identical in size or speed.

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.

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