On Jan 18, 2014, at 7:25 PM, Mark Trumpold wrote: > Hi Clemens and group, > > Good information. So, is it true that the logging/cow nature of > nilfs actually improves wear leveling by having 'writes spread out > evenly'? Of course, COW policy is much better for flash than in-place update. But even if NILFS2 (or any other file system) uses COW approach then namely FTL does wear-leveling. And namely FTL's algorithms define wear-leveling efficiency. So, I don't think that NILFS2 can improve wear-leveling. COW policy can leave FTL "cold" and to give opportunity not to use sophisticated algorithms of wear-leveling and using spare pool of erase blocks. But, moreover, it is very desirable to use TRIM command with COW policy also for improving FTL efficiency and performance. With the best regards, Vyacheslav Dubeyko. -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
