Mainboard KM51PV-754
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Appendix II: RAID Setup
Introduction to RAID
RAID (Redundant Array of Independent Disks) technology is a sophisticated disk management
system that manages multiple disk drives. It enhances I/O performance and provides
redundancy in order to prevent the loss of data in case of individual disk failure. The RAID
facility on this board provides RAID 0, RAID 1, RAID 0+1, RAID JBOD, and RAID 5.
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isk Striping (RAID 0)
Striping is a performance-oriented, non-redundant disk storage technology. With RAID striping,
multiple disks are used to form a larger virtual disk. Data is then striped or mapped across all
the physical disks. In this way, multiple I/O operations can be executed in parallel, enhancing
performance. Striping does not provide fault tolerance. The minimum number of hard drives for
RAID 0 is 2.
isk Mirroring (RAID 1)
With Disk Mirroring there are redundant disks that mirror the primary disks. Data that is written
to the primary disks are also written to the redundant disks. This redundancy provides fault
tolerant protection from a single disk failure. If a read/write failure occurs on one drive, the
system can still read and write data using the other drive. The minimum number of drives for a
RAID 1 configuration is 2. You are required to use an even number of drives.
isk Striped Mirroring (RAID 0+1)
This mode combines both the performance benefits of RAID 0 with the fault tolerance of RAID 1.
The minimum number of drives for RAID 0+1 configuration is 4 drives. This configuration also
requires an even number of drives.
Note:
All mirrored configurations or striped/mirrored
configurations should use drives of the same size.
AID SPAN (RAID JBOD)
RAID SPAN allows JBOD (Just a Bunch Of Disks) configurations which simply uses multiple
disks to form a larger virtual disk without any other specialized disk management functionality.
RAID SPAN is not considered a standard RAID implementation.
isk Rotating Parity Array (RAID 5)
RAID 5 is one of the most popular implementations of RAID. It utilizes the configurations of Byte
Stripping and Block Stripping, and writes the data to multiple disks. The minimum number of
drives for a RAID 5 configuration is 3. It possesses the
stripe error correction information;
therefore, once a read/write failure occurs on one drive,
the system can still read and
write data using the other drive.
As result,
the performance of RAID 5 can substantially
decrease in a write-heavy environment.
Before create RAID Array
Before you configure your RAID Array, you have to enable the “RAID Config” option in the BIOS
Setup Utility.
1. After you boot your system, press the “Del” key when prompted to enter the BIOS Setup
Utility.
2. The “RAID config” option for enabling RAID will be found on the “Peripherals” screen as part
of the “IDE Function Setup” section shown as below-left (Peripherals >> IDE Function Setup >>
RAID config). Arrow down to the IDE RAID item and press enter.
