Re: RAID-6

	Hello Peter ,

On 11 Nov 2002, H. Peter Anvin wrote:

Hi all,
I'm playing around with RAID-6 algorithms lately.  With RAID-6 I mean
a setup which needs N+2 disks for N disks worth of storage and can
handle any two disks failing -- this seems to be the contemporary
definition of RAID-6 (the originally proposed "two-dimensional parity"
which required N+2*sqrt(N) drives never took off for obvious reasons.)

	Was there a discussion of the 'two-dimensional parity' on the
	list ?  I don't remember any (of course) .  But what other than
	98+2+10 ,  What was the main difficulty ?  I don't (personally)
	see any difficulty (other than managability/power/space) to the
	ammount of disks required .  Tia ,  JimL
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