CalDigit RAIDShield - Manual (Page 39)

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RAID 6:
RAID 6 is stripes blocks of data and parity across an array of drives like RAID 5, except that is calculates two sets of
parity information for each parcel of data. The goal of this duplication is solely to improve fault tolerance; RAID 6 can
handle at most one fault. Performance-wise, RAID 6 is generally slightly worse than RAID 5 in terms of writes due to the
added overhead of more parity calculations, but may be slightly faster in random reads due to spreading of data over one
more disk. As with RAID levels 4 and 5, performance can be adjusted by experimenting with different stripe size.
RAID 6: Independent data disks with double parity blocks
Characteristics: Recommended use:
Array Capacity: (size of smallest drive) x
(number of drives-2).
Storage Efficiency: If all drives are the same
sizes, then ((number of drives –2) / number of
drives).
Fault Tolerance: very good to excellent.
Requires a minimum of four drives.
File and application
servers
Database servers
WWW, E-mail and News
servers
Intranet servers
Apply to high reliability
servers environment