On Fri, Jun 04, 2010 at 11:16:40AM -0700, Brandon High wrote: > On Fri, Jun 4, 2010 at 9:30 AM, Ray Van Dolson <rvandol...@esri.com> wrote: > > The ISO's I'm testing with are the 32-bit and 64-bit versions of the > > RHEL5 DVD ISO's. While both have their differences, they do contain a > > lot of similar data as well. > > Similar != identical. > > Dedup works on blocks in zfs, so unless the iso files have identical > data aligned at 128k boundaries you won't see any savings. > > > If I explode both ISO files and copy them to my ZFS filesystem I see > > about a 1.24x dedup ratio. > > Each file starts a new block, so the identical files can be deduped. > > -B
Makes sense. So, as someone else suggested, decreasing my block size may improve the deduplication ratio. recordsize I presume is the value to tweak? Thanks, Ray _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
