Solving the iostat disk mystery Our detective uses the new Solaris 2.5 trace system to track a puzzling disk activity report Abstract Disks can behave enigmatically. The only way to find out what is really happening is to delve beneath the averages shown by iostat. This month we'll use the Solaris 2.5 trace system to see each individual disk I/O and solve a riddle that has puzzled people for years