>I have achieved this function. but sometimes the schedule will missed,
>I don't know why, and there is no information in the dsmsched.log.

Then look at the log at the other end of the connection: the TSM server 
Activity Log.
There may be a situation of inadequate resources.  Be sure to also query your
schedules and assure that they are really scheduled the way you believe they 
are.

   Richard Sims   http://people.bu.edu/rbs