Adaptec SAS RAID Controllers Guía de instalación Pagina 114

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100 Sun StorageTek SAS RAID HBA Installation Guide March 2010
RAID 6 Arrays
A RAID 6 array—also referred to as dual drive failure protection—is similar to a RAID
5 array because it uses data striping and parity data to provide redundancy.
However, RAID 6 arrays include two independent sets of parity data instead of one.
Both sets of parity data are striped separately across all disk drives in the array.
RAID 6 arrays provide extra protection for your data because they can recover from
two simultaneous disk drive failures. However, the extra parity calculation slows
performance (compared to RAID 5 arrays).
RAID 6 arrays must be built from at least four disk drives. Maximum stripe size
depends on the number of disk drives in the array.
FIGURE F-8 RAID 6 Arrays
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