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Virtual Server vhd's: Fixed or Dynamic?

In a nutshell, what's the best option?
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GordonRae
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GordonRae
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50calCommented:
Using say a 20 GB Hard disk.
Fixed - Creates a 20GB empty VHD file ready for use.
Dynamic - Creates a VHD file that is only the size of the data it contains, and will expand to 20GB's.

However, even though the dynamic ones use only the space required for the data it contains they are slower to read/write than fixed drives.

50cal.
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50calCommented:
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.
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Darius GhassemCommented:
Also, when you use dynamic VHD files when you delete data from the system you don't regain the space automatically you have to run through some steps to re-gain the space.

Dynamic you must manage a little more then fixed but it allows you to grow as you store.
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