>I basically need to know what procedures / commands need to be executed once
>a tape has been destroyed...

Become familiar with the Administrator's Guide, whose guidance is invaluable
in proceeding with server guardianship.
The topic "Recovering a Lost or Damaged Storage Pool Volume" most specifically
addresses your area of concern, but also look at a PDF version of the manual
and search on "destroyed" for other relevant areas.

  Richard Sims, BU