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RAID 6 is a a new RAID format similar to RAID 5, but it adds an additional parity block, utilizing striping with two parity blocks distributed across all member disks.
This enables RAID to survive two drive failures without suffering any data loss, helping to correctly handle bad blocks during rebuild without having to suffer much of a performance loss versus RAID 5. This reduces the risks of using large parity groups.
Data Domain DD510
Data Domain DD530
Data Domain DD565
Data Domain DD580
Data Domain DDX Array
Data Domain DDX Controller
Nexsan SATABeast
Nexsan SATABeast Xi for Mac OSX
Nexsan SATABoy
Rorke Data Galaxy HDX2 - RAID
Rorke Data Galaxy 3G - Value Raid
Rorke Data Galaxy LX4 - NAS