Installation guide

Chapter 1. Introduction
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1.2.6 RAID 6
RAID 6 provides highest reliability, but not widely used. Similar to RAID 5, but
does two different parity computations or the same computation on overlapping
subsets of the data. The RAID 6 can offer fault tolerance greater that 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 that 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 writ-ten across all of the drives.