Mainboard P4M900
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Appendix II: RAID 0/ 1 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.
Disk 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.
Disk 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.
Note:
All mirrored configurations configurations should use drives of the same size.
