Sometimes a new feature is not about something that wasn’t possible before, but about making data already available more accessible. Like that information you gathered so far with Dtrace and some homegrown scripts is now available with a simple option. The -L option of the iostat command is such an example. With this command it’s really easy to get a latency distribution of accesses to your disks. As an example I will show you the command output for a single device:
So you don’t have to use DTrace scripts any longer in order to get this kind of information.