I have two ESXi servers running 4.1 and will be moving to 5.x very soon. Both servers have local storage. I have seen advertisment for Diskeeper on ESX servers. I've used Diskeeper on Windows servers but never on a Vmware ESX server. Is this a god idea. I thought a Linux OS could get fragmented like a WInodws OS. Wouldn't running Diskeeper increase I/O usage?