Doug, We went through a migration from AIX to Linux, and followed the steps John Schneider recommended in some cases. However, we also negotiated with key customers and many of them agreed to let inactive files of their clients expire on the AIX owned tape pools. We registered the clients on the Linux server, but restorals were still available from the AIX server so long as the client options file had a stanza for both servers. This saved a huge amount of processing time for us. Depending on your retention parameters, exporting inactive files may take longer than letting them expire.
Best wishes, Keith Arbogast Indiana University