Had the occasion to use the vizioncore vOptimizer utility last night – it’s pretty slick.

Does two things “automagically” that I think you’ll want to add to your toolset – though this is in addition to a ton of other things it can do.
1) Resize VMDK files (up or down – based on what amount of free space you want left)
2) Realigns VMDK partitions to the 64k starting boundary (for better i/o efficiency)

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The best part is, that you can use vOptimizer in a “trial mode” for 14 days which includes two free optimizations.

In my case, I had a single VM that had a 50GB C: drive (only using 10GB of it) and I wanted to “downsize it” to a VMDK size of 20GB.  This tool allowed me to do that beautifully (though it does power down the VM to do it – naturally you’d expect this – so plan for a maintenance window)

<img class="size-full wp-image-653" src="http://localhost/eGroup/wp-content/uploads/2009/06/voptimizer.jpg" alt="" />

Enjoy !