(We are using old version of VCenter Server 6.5 Update 1e), Yes, we are about to upgrade!
When you clone a machine in HTML5 it failes to powered on the cloned machine, this works when you are using Flash client.
In HTML5 the cloned machine still points to the original vmdk files.
In Flash it works.
Must be a bugg, but not verified.
Error message:
File system specific implementation of LookupAndOpen[file] failed An error was received from the ESX host while powering on CLONED-VM. Failed to start the virtual machine. Module ‘Disk’ power on failed. Cannot open the disk ‘/vmfs/volumes/59f0495a-9d458693-70d5-38eaa733215c/ORGINAL-VM/ORGINAL.vmdk’ or one of the snapshot disks it depends on. Failed to lock the file File system specific implementation of OpenFile[file] failed File system specific implementation of OpenFile[file] failed File system specific implementation of OpenFile[file] failed File system specific implementation of OpenFile[file] failed File system specific implementation of OpenFile[file] failed File system specific implementation of OpenFile[file] failed
Tips and Tricks 
I also faced the same issue while cloning using HTML5 VCenter 6.5
LikeLike
Hello, Did your issue resolve? If yes then how please/
LikeLike
Use flash client or use powershell or upgrade the VC.
LikeLike
Or are you running 6.7?
LikeLike
Same to me with HTML5 vCenter 6.7
LikeLike
Same here on vCenter 6.7 u3.
LikeLike
Like!! I blog quite often and I genuinely thank you for your information. The article has truly peaked my interest.
LikeLike