Hi, > First, create a 3 by 6 cauchy matrix, using x_i = 2^-i, and y_i = 0 for i=0, and y_i = 2^i for other i. > In this case: x = { 1, 142, 71, 173, 216, 108 } y = { 0, 2, 4). The cauchy matrix is: > > 1 2 4 8 16 32 > 244 83 78 183 118 47 > 167 39 213 59 153 82 > > Divide row 2 by 244 and row 3 by 167. Then extend it with a row of ones on top and it's still MDS, > and that's the code for m=4, with RAID-6 as a subset. Very nice! You got it Jim! Thanks, Andrea -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html