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 >
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