Re: raid6

On Thursday June 15, xiongzige@gmail.com wrote:

        I am confronted  with a big problem of the raid6 algorithm,
when recently I learn the raid6 code of linux 2.6 you have contributed
.
 Unfortunately I can not understand the algorithm of  P +Q parity in
this program . Is this some formula for this raid6 algorithm? I realy
respect your help,could you show me some details about this algorithm?

See:
 http://en.wikipedia.org/wiki/Redundant_array_of_independent_disks#RAID_6
and
 http://kernel.org/pub/linux/kernel/people/hpa/raid6.pdf
 
NeilBrown