Extreme console latency during disk IO (8.0-RC1, previous releases also affected according to others)

[Janet Sullivan]

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.