On 20/11/13 19:34, Andrea Mazzoleni wrote: > Hi David, > >>> The choice of ZFS to use powers of 4 was likely not optimal, >>> because to multiply by 4, it has to do two multiplications by 2. >> I can agree with that. I didn't copy ZFS's choice here > David, it was not my intention to suggest that you copied from ZFS. > Sorry to have expressed myself badly. I just mentioned ZFS because it's > an implementation that I know uses powers of 4 to generate triple > parity, and I saw in the code that it's implemented with two multiplication > by 2. > Andrea, I didn't take your comment as an accusation of any kind - there is no need for any kind of apology! It was was merely a statement of fact - I picked powers of 4 as an obvious extension of the powers of 2 in raid6, and found it worked well. And of course, in the open source world, copying of code and ideas is a good thing - there is no point in re-inventing the wheel unless we can invent a better one. Really, I /should/ have read the ZFS implementation and copied it! mvh., David -- 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
