>In my experience, the label command will not change the density of the
>tape.

Generally speaking, rewriting a tape from its beginning, as relabeling
does, is the only opportunity to change a tape's density.  This has
been true of computer tapes since the early days of open reel tapes.
Actually achieving the desired density is a function of the application
causing the drive to switch density, which in turn must be supported
and allowed by the hardware.  In TSM terms, this is a function of the
Devclass definitions.  Operating system commands are usually available
to verify tape drive attribute selections to assure that the
application has triggered the values you expect.  If not, check the
hardware to assure that it can inherently achieve that value, that
there is no operator setting preventing it, and that the media
allows it.  (Tape cartridges have sensing indentations by which drives
can determine what a given tape can do.)  If your OS attributes check
finds settings not as desired, the less usual cause could be a TSM
defect.

  Richard Sims, BU