Datastore and Disk graphs do not show any data or show it improperly after upgrading vSphere from v4 to v5.
Performance metrics are not collected properly from VMware vSphere v5 infrastructure objects. You see incorrect performance graphs or irrelevant reports generated by Veeam Monitor v5.
Here is the list of known issues in Veeam Monitor v5 regarding VMware vSphere v5 support:
All these issues are related to and have been confirmed with a new version of VMware vSphere v5.
Full support for VMware vSphere 5 environment, with new metrics, events etc, will be implemented in the next major release.
If you have any questions or problems, please contact Veeam Support at http://www.veeam.com/support.html