var datastores = VcPlugin.getAllDatastores();

function convert_to_gb(size)
{
	gbsize = size/1024/1024/1024;
	return gbsize;
}

for each (datastore in datastores){
                System.log("Datastore : " + datastore.name); 
				System.log("Capacity : " + Math.ceil(convert_to_gb(datastore.summary.capacity)) + " Free space : " + Math.ceil(convert_to_gb(datastore.summary.freeSpace)));
				System.log("Percent free : " + Math.ceil((datastore.summary.freeSpace/datastore.summary.capacity)*100));   
 }