On Wed, Aug 18, 2010 at 9:48 AM, Sigbjorn Lie <sigbj...@nixtra.com> wrote: > Hi, > > We are considering using a ZFS based storage as a staging disk for Networker. > We're aiming at > providing enough storage to be able to keep 3 months worth of backups on > disk, before it's moved > to tape. > > To provide storage for 3 months of backups, we want to utilize the dedup > functionality in ZFS. > > I've searched around for these topics and found no success stories, however > those who has tried > did not mention if they had attempted to change the blocksize to any smaller > than the default of > 128k. > > Does anyone have any experience with this kind of setup?
I tried this with NetBackup, and decided against it pretty rapidly. Basically, we got hardly any dedup at all. (Something like 3%; compression gave us much better results.) Tiny changes in block alignment completely ruin the possibility of significant benefit. Using ZFS dedup is logically the wrong place to do this; you want a decent backup system that doesn't generate significant amounts of duplicate data in the first place. -- -Peter Tribble http://www.petertribble.co.uk/ - http://ptribble.blogspot.com/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
