Here is the list of known issues in 6.0 LTS related to VMware integration.
Running the resync_clean rake task may cause the 500 Internal server error at the Virtual Servers and vApps pages
Functionality of the Partially Powered Off vCloud VSs is limited as system recognizes these VSs as Powered Off.
3.0.2 - 6.0
|CORE-13108||Users cannot delete an external network from CP after it was removed in vCD.||6.0|
A vCloud user with the Show vCloud dashboard permission enabled is not able to see the vCloud dashboard without the Show cloud dashboard permission enabled additionally.
If you try to add a VS disk to a vCenter VS using invalid service credentials, in spite of the error shown in the OnApp interface, the disk is successfully added in vSphere.
When you create a VS from a vCenter CentOS template, the CentOS icon is missing at the Confirmation step of the VS creation wizard.