On Thursday 28 March 2002 18:08, Paul Jakma wrote:
> On Thu, 28 Mar 2002, Nick Murtagh wrote:
> > Doh! You are of course right :) I was referring to RAID6.
>> and what's that when it moves from the sales brochure into the real
> world?
I don't know if it made it as far as the sales brochure :)
With help from my lecture notes*:
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.
In terms of "throughput per dollar" it's equivalent to RAID5 for reads,
and less desirable than RAID5 for writes.
Nick
*I have to do an exam in this stuff at the end of May
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