On Apr 5, 2010, at 6:32 PM, Learner Study wrote: > Hi Folks: > > I'm wondering what is the correct flow when both raid5 and de-dup are > enabled on a storage volume.... > > I think we should do de-dup first and then raid5 ... is that > understanding correct?
Yes. If you look at the (somewhat outdated) ZFS Source Tour, you will see that the ZIO "layer" feeds I/Os to the VDEV "layer" which is where raidz is implemented. In ZIO, deduplication occurs after compression and checksumming but before space allocation. The checksum and physical size are used for the deduplication table key. -- richard ZFS storage and performance consulting at http://www.RichardElling.com ZFS training on deduplication, NexentaStor, and NAS performance Las Vegas, April 29-30, 2010 http://nexenta-vegas.eventbrite.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
