Tom - You'll likely have to do the standard analysis to isolate the problem. The best first approach is to watch the session from the server, via repeated Query SEssion, and see what's happening during it. (You can get some sense of where waits were occurring in past sessions by reviewing TSM accounting log data.) If the problem is constant on one or two files, perform a cp of the file to /dev/null and see if that takes far longer than it should, which would point to file system issues. Whereas you say that other archives from that client run at good speed, then it's probably not a network configuration issue. If still stumped, run a client trace.
Richard Sims
