Daniel,

No, I don't believe there is any way to accomplish your specific request.  I
know of no supported method to move the file and volume metadata from one
TSM instance into another without also moving the data.

If your goal is to get to a single hardware platform, you can create a
second instance of TSM on the new machine and leave the old data on the
3494.

I expect, however, that your goal is to get all the clients into  a single
instance of TSM?  If so, I believe you will have to move the files.

Using the second instance will allow you to retire the old machine quickly,
if that is important.  But it's pay me now or pay me later.

Bill Smoldt    SSSI
STORServer, Inc.