Leandro,
The randomization you speak of is an ADSM feature, to quote:
        "To randomize start times for schedules means to scatter each
        schedule's start time across its startup window.  A startup window
is
        the start time and duration during which a schedule must be
initiated."

This supposedly reduces the network and server being hit at once with all
the clients defined to a single schedule starting simultaneously.

You can control randomization by specifying a percentage between zero(0), no
randomization, and 50%.  This is controlled by issuing a "set randomize nn"
command to your server.  This will affect ALL schedules.

Hope this helps
Randy