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Date: Tue, 13 Nov 2012 16:43:33 +0100
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Jason Keltz <jas@cse.yorku.ca>
Subject: Re: RHEL to FreeBSD file server
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Jason Keltz wrote:
> Thanks for your reply Bob!  I've thought about adding more memory to the
> R720 which can go up to 768 GB. I'm just not quite sure how much we
> need, but it can never hurt to add more, I guess. I know you can never
> have too much memory!! :)

Yes you can:

http://www.zfsbuild.com/2012/03/02/when-is-enough-memory-too-much/
http://www.zfsbuild.com/2012/03/05/when-is-enough-memory-too-much-part-2/

I don't know if the same problem exists on FreeBSD or not.

I recommend you to read a whole blog "zfsbuild". There are many useful 
informations.

Miroslav Lachman