If you have issues starting up the Virtual Machine in your VMware ESXi 5.1 infrastructure: You might need to do the following.
- Open a console to ESXi host.
- Run this command to load the multiextend module
- Convert the vmdk image, by going to the location of the virtual machine and then run the following command
- Delete the original disk
- Rename the cloned disk to the original disk name
- Unload the multiextent module