//
// Refine the preceding rule to apply only between the hours of 9am and 5pm,
// and to require that just 3 of the four samples exceed the threshold
//
$hour >= 9 && $hour <= 17 && some_inst 75 %_sample
    disk.dev.total @0..3 > 40 count/sec
	-> print "disk busy for 20 sec" &
	   shell 5 min "dkvis";