This is an old post that I saved.  It still did not work for me but give it
a try.
I heard it was a bug that may be fixed in version 4.x???

I had a problem with this and searched the adsm.org and found
a tip (don't recall from whom - but thanks) to use wildcard
delete rather than name etc.

I did this:

 adsm> delete backupset * * begind=03/01/2001 endd=-14
 ANR2365I Backupset MACOS9.412.336789572 for node MACOS9.412 has been
deleted.

 adsm> q volh type=backupset
 ANR2034E QUERY VOLHISTORY: No match found using this criteria.
 ANS8001I Return code 11.

and it worked for me ... it may work for you (let's hope so).

Sheelagh
--
Sheelagh Treweek
Sheelagh Treweek
Oxford University Computing Services
Email: sheelagh.treweek AT oucs.ox.ac DOT uk
Phone: +44 (0)1865 273205 Fax:-273275
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                    "Warren, Matthew
                    James"                     To:     ADSM-L AT VM.MARIST DOT 
EDU
                    <matthewjames.warre        cc:
                    n AT EDS DOT COM>                 Subject:     Re: URGENT: 
How to delete backupsets
                    Sent by: "ADSM:
                    Dist Stor Manager"
                    <[email protected]
                    DU>


                    10/03/2001 08:58 AM
                    Please respond to
                    "ADSM: Dist Stor
                    Manager"





Hello,

No help I'm afraid, but I'm interested as we have 2 tapes that were used to
create a backupset as a test a long time ago, and Ive never been able to
free them up either.


Matt.