zfs discuss - Feb 2011 - existing performance data for on-disk dedup?

Hello.  I am looking to see if performance data exists for on-disk 
dedup.  I am currently in the process of setting up some tests based on 
input from Roch, but before I get started, thought I''d ask here.

Thanks for the help,
Janice

Hi Janice,
> Hello.  I am looking to see if performance data exists for on-disk dedup. 
I am currently in the process of setting up some tests based on input from Roch,
but before I get started, thought I''d ask here.
I find it somewhat interesting that you are asking this question on behalf of
work you are doing for Roch, wherein Roch posted the following blog, with
references.

	http://blogs.sun.com/roch/entry/dedup_performance_considerations1

That said, there is the ZFS page:

	http://hub.opensolaris.org/bin/view/Community+Group+zfs/dedup

As far as synthetic testing of dedup, I found that the latest version of VDBench
supports dedup, and is helpful on narrowing in on specific issues related to the
size of the DDT, the ARC and L2ARC.

	http://blogs.sun.com/henk/entry/first_beta_version_of_vdbench

Jim

> 
> Thanks for the help,
> Janice
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