This does NOT make sense as you just move but not solve your problem.
It have sense for me ;-)
Everyday, I eject (manually, I'm not alphastor provided) tapes from my silo.
But, last night, NW was hungry of tape, so he took 3 tapes for saving clients. But, due to a problem, he did not fill the 3 tapes in the same way : 2 were greatly filled, and the last was ridiculously filled. So I wanted to migrate my little saveset to one of the 2 tapes in order to eject 2 tapes, and relabelling the third tape for this night, thus saving a tape (SDLT-320).
I confess I mis-ask (!) my problem... The real reason was not the ssretent...