Diskeeper is addressing the need to take care of virtual machines (VMs) and their virtual hard drives with V-Locity, released to manufacturing today.
V-Locity defragments Hyper-V servers and VMs, but it does a lot more. According to Diskeeper's release about the product, it also "synchronizes the complex and ongoing activity between host and multiple guest operating systems" to improve performance.
The product also reclaims space used by dynamically growing virtual drives that don't shrink again when space is freed up.
Visit Diskeeper's site for contact information.