Re: Status of Tripe Parity RAID

[David Brown <david.brown@hesbynett.no>]

On 02/08/14 10:11, Ronny Egner wrote:
> Dear All,
>
> i would like to ask about the status of Tripe Parity RAID.
>
> I´ve found some posts on the list from Andrea Mazzoleni dating back to
> 2013
> but after that nothing seemed to be moving.
>
> If this is currently not on the wish list i would like to add that as
> Feature Request :-)
>
>
> Thanks Neil for this great piece of software.
>

I believe Andrea got the code working for doing the multiple parity raid 
calculations, but I don't know how complete it is.  I have looked at his 
maths, and agree that it is solid - and I think the general opinion is 
that he has found the best algorithms for the task (better than the one 
I came up with, and better than the one used by ZFS for triple parity).

As far as I know, no work has been done on integrating this into the md 
code itself, nor into the mdadm code.

As Neil says, we don't need a feature request on this - it is already 
requested.  We need someone who is able to spend the time putting it 
together.  The mathematical bit is in place, so it doesn't have to be a 
person (or people) who understands that part so well.


David


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