I believed most of system administrator and vmware administrator experiencing these issues when cloning a virtual machine on ESXi vCenter server.
Symptoms
Cloning process fails at approximately 90% with error message:
Number of virtual devices exceeds the maximum for a given controller
Solutions:
1. Make sure there are no CDs or ISOs mounted to the VM
2. Make sure that the source machine has been Power off before the clone to get a clean copy.
3. Clone the virtual machine again, without selecting the Edit Virtual hardware (Experimental)option.
4. Finish