Gotcha 1: VM Hardware Version 10
So, should you upgrade? Here's the first gotcha. And it's a big enough gotcha that there is VMware KB 2061336 to address it! If you upgrade, you will incur two potentially problematic issues:
- The VM will only be editable in the vSphere Web Client; the legacy (desktop) client will allow you to view but not edit the hardware.
- This is especially problematic if you don't have a good vCenter implementation (which you should) or have some standalone hosts...you won't be able to manage them the way in which you are accustomed.
- If you have a standalone host, you will have to use the vCLI or Power CLI to manage the VMs on that host; the only supported GUI is the vSphere 5.5 Web Client.