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Date: Sat, 2 Jun 2012 10:30:50 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Dennis Glatting <dg@pki2.com>
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Cc: freebsd-questions@freebsd.org, Oscar Hodgson <oscar.hodgson@gmail.com>
Subject: Re: Anyone using freebsd ZFS for large storage servers?
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> I have another storage server named bd3 that has a RAIDz2 array of 2.5T 
> drives (11 of them, IIRC) but it is presently powered down for maintenance.

seems you don't need performance at all if you use RAIDz1/2 and ZFS. 
unless "performance" for you means how fast 1GB file are read linearly.