Defrag Virtual Hard Drive in vSphere 4 Hypervisor

Hey Guys

I noticed the hard drives on my VM's were fragmented badly in the operating system and in the VM virtual hard drive.

I have defragged the hard drives in Window Server 2008, but I can't find how to defrag the VM virtual hard drive. I thought you could power off the VM, edit the VM settings and choose defrag VM hard drive. However, I can't find that option.

Is it possible to defrag a VM hard drive in vSphere 4 Hypervisor? If so how do you do it?

Any help would be greatly appreciated.

Kind Regards

Aaron