On Wed, Jan 05, 2011 at 07:41:13PM +0100, Diego Calleja wrote: > On Miércoles, 5 de Enero de 2011 18:42:42 Gordan Bobic escribió: > > So by doing the hash indexing offline, the total amount of disk I/O > > required effectively doubles, and the amount of CPU spent on doing the > > hashing is in no way reduced. > > But there are people who might want to avoid temporally the extra cost > of online dedup, and do it offline when the server load is smaller. > > In my opinion, both online and offline dedup have valid use cases, and > the best choice is probably implement both. Question from an end-user. When we say "offline" deduplication, are we talking about post-process deduplication (a la what Data ONTAP does with their SIS implementation) during which the underlying file system data continues to be available, or a process that needs exclusive access ot the blocks to do its job? Ray -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
