My understanding is that RAID 5 -always- stripes parity.  If it didn't,
I believe it would be RAID 4.

You may find http://linux.cudeso.be/raid.php of interest.

I don't think RAID level 6 was in the original RAID paper, so vendors
may have decided on their own that it should mean what they're
selling.  :)

On Wed, 2005-11-16 at 12:54 -0500, Bill Davidsen wrote:
> Based on some google searching on RAID-6, I find that it seems to be 
> used to describe two different things. One is very similar to RAID-5, 
> but with two redundancy blocks per stripe, one XOR and one CRC (or at 
> any rate two methods are employed). The other sources define RAID-6 as 
> RAID-5 with a distributed hot spare, AKA RAID-5E, which spreads head 
> motion to all drives for performance.
> 
> Any clarification on this?
> 

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