Thanks to everyone who contributed. I picked up some very useful tips. I find that when I run the job in the "Test Environement" using LSF, it completes without error. It appears that my problems were a result of the system settings on my development PC. By the way, can anyone explain:

%let XXAMWAIT=#; where # is the number of minutes to wait.

It was suggested by an "old timer" at SAS Institute, but I cannot find it documented anywhere.

On Wed, 11 Apr 2007 07:57:24 -0700, Jeff J. Voeller <SAS- Programmer@WYWH.COM> wrote:

>On Tuesday, April 10, 2007 at 3:06 p.m. >David Mabey wrote: > >> I am using FILENAME FTP to feed a large file that resides on z/OS tape >> to a batch SAS DATASTEP running on a PC. Every thing works fine until >> the tape robot needs to mount a new tape. Then the job hangs. The SAS >> log never completes and the SAS dataset that is being produced remains >> locked. > >Are you using the DEBUG option on your FILENAME FTP statement? It might >tell you something useful. > >Are you sure that your site allows tape mounting via this method? It's >fairly common (at least in my experience) to only allow tapes to be >accessed via JCL allocation. > >If the dataset is on tape because it's enormous and/or you only need a >portion of that dataset (i.e., selected records and/or columns), it's >likely preferable to have a mainframe job write a subset of the data to >DASD, then use FTP to work with that subset. Since batch jobs can be >submitted via FTP, you can even incorporate that submission into your >existing process on the PC side.