Adding a paravirtual controller and disk to existing VM

Hi,

Are there any example scripts using the perl sdk on how to add a paravirtual scsi controller and a disk to a existing VM?

I've modified my vmcreate.pl script to create a paravirtual controller instead of a Buslogic at VM creation time. How do I add a disk to this controller, OR add another paravirt controller and a disk?

Thanks!