> We have tried:
>
> 1    Halting ADSM server;
> 2    Putting 3570 tape library to AUTOMATIC mode (from RANDOM mode)
> 3    Unloading current tape volumes from library and loading up new
> tapes to be labelled
> 4    Using dsmlabel command with drive and libary options and
> with/without search option.

You're close.  It should work with the drive in Random mode.  In that
mode, dsmlabel's library and search commands should be able to pick the
tapes one at a time for labeling.

dsmlabel -drive=/dev/rmt0,16 -library=/dev/rmt0.smc -search

If you have a file of labels, you can redirect it to the command with <
rather than manually typing each label.