so basically all those old machines end up on ebay<br><br><div class="gmail_quote">On Tue, Jan 20, 2009 at 8:35 AM, Greg Lindahl <span dir="ltr"><<a href="mailto:lindahl@pbm.com">lindahl@pbm.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="Ih2E3d">On Tue, Jan 20, 2009 at 08:14:35AM +0100, Jon Aquilina wrote:<br>
<br>
> in all honesty is there a need really to replace the cluster. why not just<br>
> add onto it?<br>
<br>
</div>Think about it: if you pay 1/3 the cost of a new node per year in rent<br>
and utilities, and nodes get twice as fast for the same cost every 18<br>
months. Let's say that means each year performance increases by 60%<br>
(close enough for our purposes.)<br>
<br>
Year 1: I pay 1.33$ for 1 unit of performance<br>
Year 2: I pay 0.33$ for 1 unit of performance -- or 1.33$ for 1.6 units of performance<br>
Year 3: I pay 0.33$ for 1 unit of performance -- or 1.33$ for 2.56 units of performance<br>
Year 4: I pay 0.33$ for 1 unit of performance -- or 1.33$ for 4.1 units of performance<br>
<br>
Hey! In year 4 it's about the same to keep the old cluster, or throw<br>
it out and buy a new one. (If I want to spend the same $$, I can buy a<br>
cluster 1/4 the size, but same performance, as the original one.)<br>
<br>
And in year 5, it's a big win to buy the new stuff.<br>
<br>
If you don't pay rent and utilities, then sure, you'll probably keep<br>
as much junk as will fit in whatever space you have. Maybe the cluster<br>
I put together in 1998 at UVa is still running...<br>
<font color="#888888"><br>
-- greg<br>
<br>
<br>
<br>
</font></blockquote></div><br><br clear="all"><br>-- <br>Jonathan Aquilina<br>
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