Architecting a vCloud Director Solution : Operational Considerations : 11.1 vCloud Director Monitoring : 11.1.3 Time Synchronization
   
11.1.3 Time Synchronization
Time synchronization is important for the following scenarios:
An event occurs that requires the reconstruction of other past events with respect to time.
An event does not take place because it was dependent on other events that should have executed in a specific time sequence but did not due to lack of time synchronization or incorrect time.
The ability to reconstruct past events from related infrastructure components provides administrators the opportunity to analyze problems and implement effective corrective actions.
Configure NTP synchronization to a common stratum layer source in the admin zone for all ESXi hosts and vCloud components. For virtual machines, use w32time for Windows and NTP for Linux.
Use the same time zone for vCloud Director cells and database.