By any means - could it be that you not only transfer "large amounts of data" to, but also deleting data from the deduped zpool?
I have played around for some time with ZFS/dedupe and it seems that as soon as dedupe is enabled on a pool, deleting files - or even overwriting them, will lead to performance impacts. This seems to be mainly due to the nature of dedupe and I know that e.g. a NetApp VTL with dedupe enabled will only remove deduped Data "offline", say overnight. On my OpenSolaris box I added an Intel X25 SSD to the pool and used it as a cache. That seems to speed up deletion of data from the pool, but only to a certain degree. When I checked the ZFS discussion list for this issues, I even read that they were thinking of prohibiting file deletion on deduped zpool at all. ;) At the moment I am using dedupe on a pool I am using to do my backup to disk, instead of backing up to tapes. I think that the nature of this use is more to the liking of dedupe. I will likely never use dedupe on any kind of production voiume the way it works atm. Just my 2c, budy -- This message posted from opensolaris.org _______________________________________________ opensolaris-help mailing list opensolaris-help@opensolaris.org
