Here is far more than I could capture already written about disk alignment for both physical and virtual machines so I will not attempt to recount the reason, theories and proofs for having aligned drives. So you know that you need to have your drives aligned but you have 2000+ virtual machines and you find that your drive alignment is off… now what? You (and your team) continue to search for a solution that is the most effective use of technology to help bring the world into alignment. Enter finally one simple amazing tool from Nicholas Weaver, UBERalign.
UBERalign allows for fast and if setup to concurrent VM drive alignment correction. There are some caveats that are pointed that need to be taken into account so before testing please read the details through. Test it out and then get on UBERaligning your virtual world away.