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Date:      Fri, 19 Dec 2008 11:12:36 +1100
From:      Andrew Snow <andrew@modulus.org>
To:        Matt Simerson <matt@corp.spry.com>
Cc:        freebsd-fs@freebsd.org
Subject:   Re: ZFS performance gains real or imaginary?
Message-ID:  <494AE6F4.30506@modulus.org>
In-Reply-To: <22C8092E-210F-4E91-AA09-CFD38966975C@spry.com>
References:  <22C8092E-210F-4E91-AA09-CFD38966975C@spry.com>

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 > Did I miss some major ZFS performance enhancements?

ZFS under 7 is almost completely useless, since I can make it crash 
reliably by running "rsync", there's not alot of point talking about its 
speed!

  Would changes committed since mid-August (when I
> built my last ZFS servers from -HEAD + the patch) and now explain this?

Yes.

> If so, then I really should be upgrading my production ZFS servers to 
> the latest -HEAD.

Thats correct, that is the only way to get the best working version of 
ZFS.  Of course, then everything is unstable and broken - eg. SMBFS 
became unusable for me and would crash the server.

. ZFS
> compression is effectively getting me 1/3 more disk space off my 1.5TB 
> disks

You should try gzip-9 compression mode, it saves almost that much space 
again all over :-)


- Andrew



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