为什么RAID6比RAID5性能高1000倍

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RAID6支持两块盘同时坏，同时在线更换，当然阵列要浪费2块盘的容量。RAID5只支持一块盘坏，如果两块盘同时坏了，数据就很难恢复了，即使恢复也要花费很多银子。

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Areca is the no. 1 to delivery Intel RAID 6 inside product in the market

What products support RAID 6?
RAID 6 is available with controller model with RAID 6 engine installed.  

What is the difference between RAID 6 and RAID 5?
RAID 6 allows two drives to fail simultaneously without downtime or data loss. However, RAID 5 only allows one drive to fail. RAID 6 thus provides a much higher level of fault tolerance than RAID 5. It is a perfect solution when data is mission-critical.
Due to this higher level of protection, users can set up larger RAID volumes, spanning up to 56 physical drives.  With ARECA RAID 6 engine.  RAID 6 and RAID 5 have similar performance in the SATA RAID controller.

大家都是搞技术的，就不翻译了。
现在RAID6只支持SATA一代和二代硬盘，SCSI和FC硬盘的ARECA  RAID6引擎还在研发中。