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Datastore freespace is not realtime. I don't know what the polling interval is but if you have grossly overcommitted storage and run close to the limit I would set up an external service to monitor freespace. SNMP is available as well as several scripting types.
Hi,
We have set up monitoring with an snmp tool directly on the SAN that is far more precise because it gives also the SAN snapshots space by volumes. But the idea is to have a view in vCenter that is more accurate in time.
So I probably follow your advice and set up powershell scripts to refresh the datastore usage.
Regards.