Tom - To factors which come to mind are: - Lack of collocation can make for a lot of tape repositioning, which, depending upon your tape technology, can be painful. - I know from experience, watching reclamations, that tapes which have been sitting unused for long periods of time (years) can be more difficult to read than recently written tapes.
If you are using node or filespace collocation, I would try doing Move Data on one or more of the feeder volumes involved, and see if that process is sluggish, which means an issue with the old storage pool tape. Once on a fresh tape, I would expect the export to move faster, with no tape read struggling. If you have a disk storage pool in you hierarchy, you might try moving data there, to eliminate the tape factor in seeing where the slowdown is. Beyond that, you would need to engage in problem isolation Richard Sims
