I apologize if a solution to this is posted somewhere else, but I am new to this list and any help you can give me is greatly appreciated. I am running Tru64 v5.1 on a 4 CPU GS160 with 4GB memory. I compiled both 2.0.6 and 2.0.5 and both seems to work. I have, however, noticed the following behavior. My problem: When I try to copy large files, 14 GB/file or more, I get good performance initially. As it runs I see the free memory go down until there is very little left. At that point the transfer speed goes WAY down (about 1/6th), and 1 cpu gets fully utilized. Any Ideas? Mark O