Question : Virtual Server vhd's: Fixed or Dynamic?

In a nutshell, what's the best option?

Answer : Virtual Server vhd's: Fixed or Dynamic?

Take a look at http://blogs.technet.com/b/winserverperformance/archive/2008/09/19/hyper-v-and-vhd-performance-dynamic-vs-fixed.aspx which has a nice overview of the performance change between fixed and dynamic.

50cal.