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Date: Thu, 15 Oct 2009 10:44:52 -0700
From: Janet Sullivan <netgeek@bgp4.net>
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To: Steven Hartland <killing@multiplay.co.uk>
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Cc: freebsd-stable <freebsd-stable@freebsd.org>,
	Thomas Backman <serenity@exscape.org>
Subject: Re: Extreme console latency during disk IO (8.0-RC1,
 previous releases also affected according to others)
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Steven Hartland wrote:
> We're not running 8 yet but we do have a 7.x box which its under fairly
> high IO load doing mrtg graphs which has similar behaviour. When typing
> a command on ssh it will freeze for may seconds. 

We have a FreeBSD 7.2 cacti box running on a dell 1950 that has the same 
problems.  RRDs are disk i/o hogs, and when disk i/o shoots up, the box 
  becomes non-responsive for a few seconds.