On Mon, Aug 11, 2008 at 1:07 PM, Vectorz Sigma <vectorz3 AT gmail DOT com> 
wrote:
> I have a mail server that has a very large number of files on its fs.  We're
> talking in the 10's of millions of files.   Therefore, as you can imagine,
> the differential comparison calculations nightly take a very long time and
> even after extending the timeout period to something crazy like 6 hours it
> still times out.   Anyone have any performance suggestions for doing daily
> differential calculations?

Use calcsize or server-side estimates?  see the 'estimate' dumptype parameter.

Dustin

-- 
Storage Software Engineer
http://www.zmanda.com