On Thu, 2002-03-28 at 18:26, Nick Murtagh wrote:
> Basically with RAID5 you have one disk's worth of parity distributed
> over the disks. With RAID6 you have two disk's worth. It uses
> something called P + Q redundancy, which is some fancy maths involving
> Reed-Solomon codes. So you have two redundant disks, giving you protection
> against up to two disk failures.
>Hey we invented that one lunch time when discussing a fault tolerant
distributed network block device that would stay up even when n machines
where down.
I knew I should have taken a picy of the white board diagrams.
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