RAID Foldout
1
RAID Instruction
Introduction
RAID (Redundant Array of Independent Disks) is a method of combining two hard
disk drives into one logical unit. The advantage of an Array is to provide better
performance or data fault tolerance. The motherboard comes with the Intel ICH8R/
ICH8DH/ICH8DO. The following RAID configurations are provided for users.
RAID 0 (Striping)
RAID 0 reads and writes sectors of data interleaved between multiple drives. If any
disk member fails, it affects the entire array. The disk array data capacity is equal
to the number of drive members times the capacity of the smallest member. The
striping block size can be set from 4KB to 128KB. RAID 0 does not support fault
tolerance.
RAID 1 (Mirroring)
RAID 1 writes duplicate data onto a pair of drives and reads both sets of data in
parallel. If one of the mirrored drives suffers a mechanical failure or does not
respond, the remaining drive will continue to function. Due to redundancy, the drive
capacity of the array is the capacity of the smallest drive. Under a RAID 1 setup, an
extra drive called the
“
spare drive
”
can be attached. Such a drive will be activated to
replace a failed drive that is part of a mirrored array. Due to the fault tolerance, if any
RAID 1
drive fails, data access will not be affected as long as there are other
working drives in the array.
RAID 5
RAID 5 Provides data striping at the byte level and also stripe error correction
information. This results in excellent performance and good fault tolerance. Level
5 is one of the most popular implementations of RAID.
RAID 10 (0+1)
RAID 10 is a combination of striping and mirroring. This configuration provides
optimal speed and reliability, but you need four SATA hard disks.
JBOD(Spanning)
JBOD(Just a Bunch of Disks)combines drives into larger logical volumes.It pro-
vides no fault tolerance,nor does it provide any improvements in performance
compared to the independent use of its constituent drives.
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