Every VMware administer should have this beautiful tool – VMware vSphere Health Check!!
To set it up, you need to:
1) Install vSphere PowerCLI and PowerGUI, and download the Health Check PowerPack file.
2) Run PowerGUI Admin Console and import the Health Check PowerPack file.
3) Add the target vCenter address then click connect.
4) Expand the list in the left pane and choose the checks to run. In my example, I am checking the Time Synchronization settings. And the report can be exported as CSV, XML or HTML.
Jackie Chen's IT Workshop 
I get this – the term ‘Add-ManagedHost’ is not recognized as the name of a cmdlet function script file or operable program. Check the spelling of the name or….”
Have you installed ‘vSphere PowerCLI ‘?