Chip -

This is a case where the server records need to be examined. Look in
the TSM server Activity Log for what's happening during that period,
and review the TSM accounting records for the recorded wait time
values. If need be, perform Query SEssion during the backups to see
what clients may be waiting on (drives, volumes, etc.).

Just looking at the client side of things gives you only half the story.

  Richard Sims