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  Home | Press & Events | How RAID 6 Work  
  How RAID 6 Works  
 
Raid 6 Diagram 01 Raid 6 Diagram 02 Raid 6 Diagram 03
Raid 6 Diagram 04 Raid 6 Diagram 05 Raid 6 Diagram 06
Raid 6 Diagram 07 Raid 6 Diagram 08 Raid 6 Diagram 09
Raid 6 Diagram 10 Raid 6 Diagram 11 Raid 6 Diagram 12
 
     
 
  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.  
 
 
     
  RAID 6 VS RAID 5  
     
 
In complex arrays (12-24 drives), RAID 6 applications would be a preferred choice due to the fact that Serial ATA drives used in the arrays have a lower duty cycle and may be more likely to fail in 24/7 or business-critical applications. In small arrays (4-12 drives), RAID 5 applications can quickly repair a failed drive and restore lost data-without taking down the array. It's perhaps the most cost-effective, fault-tolerant data protection solution currently available for small storage devices.
  • Designed for tolerating two simultaneous HDD failures by storing two sets of distributed parities.
  • Simplified hardware implementation
  • A matured industry standard
 
  • 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
  • The risk of simultaneous drive failures grows in proportion to the drive array and can increase if customers purchase all of the disks in an enclosure at one time.
  • If the system finds a faulty sector on another drive during this degraded state (one drive down, spare drive being rebuilt), the RAID 5 system would be unable to restore the data onto the spare drive, resulting in data loss.
  • Disk array consists of 12 disks or more
  • Disk array consists of 10 disks or less
  • Desktop: EnhanceRAID T8
  • Rackmount: EnhanceRAID R14; UltraStor RS16
  • Desktop: EnhanceRAID T4HCR, T5,T8
  • Rackmount: EnhanceRAID R4,R6,R8; UltraStor RS8 or RS2080
 
 
     
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