The OVA is the OVF folder contents all zipped into a single file.
An OVF is a collection of items in a single folder. Most commonly
this is a description file (.ovf) a manifest file (.mf), and virtual
machine state files (*.vhd or *.vmdk)
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So if you have the OVA file, that VMDK is inside it. Upon deployment, it is being unzipped in a temporary folder and then contents are installed.
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few things to check:
- check that you've got the OVA file fully downloaded, and not the OVF.
- you should be deploying from virtual_center, not from host (e.g. your VI_client is connected to the VC)
- you must have permissions
- there has to be some free space (locally and on the VC) so that OVA can be expanded
