If you use the RESOURCEUTILIZATION parm in your dsm.sys/opt file, you will want to know about the following flash:
Under a specific, limited combination of conditions, the Tivoli Storage Manager (TSM) backup-archive client might omit files from backup or archive operations without reporting an error. The support flash from 04/03 lists the specific combination of multiple conditions that must coexist in order to develop this exposure. http://www-1.ibm.com/support/docview.wss?uid=swg21233779