Hi guys, Yes, the specialized metadata tier does improve dedup performance, however, this a general facility with many performance related aspects; there's much more can be done to address dedup performance specifically, some interesting ideas gave been discussed at prior open-zfs meetings, as I recall.
Boris Typos courtesy of my iPhone > On Jun 26, 2014, at 9:49 AM, "Sarah Jelinek" <[email protected]> > wrote: > > As Dan notes we have a special vdev class which you can use for a dedicated > dedup metadata or general metadata, or zil. This work was done by Boris > Protopopov. It generally improves dedup performance however, we still see > about a 4x degradation in performance(dedup vs non-dedup) even with the use > of the 'special' device. > > Certainly give it a whirl. We are currently working on getting this up to > date for integration into illumos so there will be some changes. We will post > performance data prior to the integration. > > Regards, > sarah > > >> On Wed, Jun 25, 2014 at 8:17 AM, Dan McDonald <[email protected]> wrote: >> >> On Jun 25, 2014, at 9:18 AM, Will Andrews <[email protected]> wrote: >> >> > Hi, >> > >> > Has anyone worked on improving this feature lately? >> >> Nexenta has done some work here. But I'm not sure how much of it is in the >> wild yet vs. still under development. You should look at their illumos-gate >> child: http://github.com/Nexenta/illumos-nexenta/ to be sure. In >> particular, their "special vdev" class work (...zfs/special.c), where you >> can put metadata on a dedicated vdev. >> >> Dan >> >> _______________________________________________ >> developer mailing list >> [email protected] >> http://lists.open-zfs.org/mailman/listinfo/developer > > _______________________________________________ > developer mailing list > [email protected] > http://lists.open-zfs.org/mailman/listinfo/developer
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