Hi Peter, > > Yes, being a generator for GF(2^8) is a requirement for a parity > > generator (sorry for the confusing terminology here - if anyone has a > > better suggestion, please say) to be part of a 255 data disk system. > > However, being a GF generator is necessary but not sufficient - using > > parity generators (1, 2, 4, 16) will /not/ give quad parity for 255 data > > disks, even though individually each of 1, 2, 4 and 16 are generators > > for GF. [...] > It is also worth noting that there is nothing magical about GF(2^8). It > is just a reasonable tradeoff when tables are needed. I, then, ask you too. What is this story that being a generator is not enough? Is there any reference, documentation, link which can be studied in order to understand this limitation? In all RS papers I found, the only constrain put was that the Vandermonde must be constructed with generators. Not all RAID examples used them, but no paper, at least for what I understood, was limiting the generators to be also "independent". Any undestandable explanation? Thanks, bye, -- piergiorgio -- 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
