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Date: Wed, 21 Mar 2012 17:12:10 -0700
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From: Artem Belevich <art@freebsd.org>
To: andy thomas <andy@time-domain.co.uk>
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Subject: Re: ZFS read/write performance slows with time
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On Wed, Mar 21, 2012 at 4:56 PM, andy thomas <andy@time-domain.co.uk> wrote:
> A server running 64-bit FreeBSD 8.0 boots from a SATA disk and then mounts a
...
> But over a period of time, this performance begins to deteriorate and after
> 180 days of uptime

If it's indeed 8.0 that you are running, I would strongly recommend
upgrading to 8-STABLE or 8.3 when it's released.
A *lot* of things in ZFS got fixed/improved since ZFSv13 in 8.0.

--Artem