I took a look at your paper. It's magic! :) My head hurts. :(
Ok, I understand that 27 disks is the limit. But is that usable? Would it be too slow? The disk IO seems unreasonable with 27 disks.
Shouldn't be too different from RAID-5, at least as long as you have reasonably large I/O transactions.
However, unless someone can actually test it out, it's hard to say.
Note that supporting RMW on RAID-6 is definitely a possibility; I tried it once on a 6-disk configuration (the only one I have) and it was slower.
-hpa
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