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Sep 22, 2009

How RAID 6 works?


RAID 6 is designed for tolerating two simultaneous HDD failures by storing two sets of distributed parities. Apparently the complex mechanism is likely to compromise data rate in and out of the system. With direct support from Intel IOP, Enhance has enabled RAlD 6 in both DAS series and iSCSI series with minimal performance hit. RAlD 6 significantly enhances the reliability of the new EnhanceRAID family even both are built upon low-cost high capacity SATA drives.

Brief
RAID 6 is designed for tolerating two simultaneous HDD failures by storing two sets of distributed parities. Apparently the complex mechanism is likely to compromise data rate in and out of the system. With direct support from Intel IOP, Enhance has enabled RAlD 6 in both DAS series and iSCSI series with minimal performance hit. RAlD 6 significantly enhances the reliability of the new EnhanceRAID family even both are built upon low-cost high capacity SATA drives.

Pro
  • Designed for tolerating two simultaneous HDD failures by storing two sets of distributed parities.

Con
  • For RAID 6, one needs a more complex system with a method for encoding, as well as XOR calculations. For that, one really needs hardware acceleration, otherwise the performance suffers.
  • Uses 2 drives for parity

Recommended Configuration
  • Disk array consists of 12 disks or more

Recommended Solutions
  • Desktop: EnhanceRAID T8
  • Rackmount: EnhanceRAID R14; UltraStor RS16




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