On Fri, 18 Feb 2005, Adam wrote:

> Well dns was being run on a bunch of dell blades also doing inbound MX.
> there are 4 of these machines doing DNS from what i've gathered. 2x for 
> non-static ips and 2x for static ip customers. Around 30,000 in total.

That does seem rather overkill - 3M requests/day is about 30 
requests/second.  I would think 1 of those boxes in single-proc mode would 
handle it fine.