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APPENDIX
RAID 6
RAID 6 provides the highest reliability. It is similar to RAID 5, but
it performs two different parity computations or the same compu-
tation on overlapping subsets of the data. RAID 6 can offer fault
tolerance greater than RAID 1 or RAID 5 but only consumes the
capacity of 2 disk drives for distributed parity data. RAID 6 is an
extension of RAID 5 but uses a second, independent distributed
parity scheme. Data is striped on a block level across a set of
drives, and then a second set of parity is calculated and written
across all of the drives.
JBOD
(Just a Bunch Of Disks) A group of hard disks in a RAID controller
are not set up as any type of RAID configuration. All drives are
available to the operating system as an individual disk. JBOD does
not provide data redundancy.
Single Disk (Pass-Through Disk)
Pass through disk refers to a drive that is not controlled by the
RAID firmware and thus can not be a part of a RAID volume. The
drive is available to the operating system as an individual disk.
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