//
// Refine the preceding rule further to print the host name and disk name
// for which the threshold is exceeded
//
$hour >= 9 && $hour <= 17 &&
some_inst (
    75 %_sample (
	disk.dev.total @0..3 > 40 count/sec
    )
) -> print "disks busy for 20 sec:" " [%h]%i";