On Mon, Sep 27, 2010 at 08:28:07AM -0400, Martin, Jonathan wrote:
> You cannot expire individual images on a media and re-use that space.
> Once a certain image has been written, NetBackup will not overwrite that
> position on the media until the entire tape has expired.

Right.  And it's not just NBU.  It's a limitation on (modern) tape
media.  If you write to a tape device, all the information after that
point becomes inaccessible.  So backup programs can't fill in "holes" in
the tape.

If you want to free up space like this you need to duplicate any images
that remain on the tape to a new tape, then recycle the media entirely.

-- 
Darren
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