This is an expected behavior in VMware vCenter Server 6.0.
- The Storage Reports selection from an object's Monitor tab is no longer available in the vSphere 6.0 Web Client.
- The Storage Views tab is no longer available in the vSphere 6.0 Client.
The Storage Monitoring Service plug-in is for the previous versions of VMware vCenter Server. This plug-in is visible if an earlier version of the vSphere Client is installed. VMware recommends to uninstall earlier versions of the vSphere Client that are no longer in use.