Well... problem is that originaly the tapes where labelled with 6 chars.
If you wish to use 8 char volser, you need to relabel them after having enabled 
the 8 char volser reporting on the library.

First check out your tapes (remove=no), then launch: 
label libv search=yes labelsource=barcode checkin=scratch overwrite=yes 
Labelsource=barcode allow the use by tsm of the volser reported by the library 
(8 char in your case)
Overwrite=yes instruct tsm to overwrite the original label written on the tape, 
except if the label already exist in a storage pool or in volhistory

Be carefull that, using 6 char labelled tapes with 8 char volser reporting on 
the library will generate potential mistakes when, particularly, checking in 
tapes without checklabel or auditing librarry with checklabel=barcode
So you have to choose, first, waht kind of volser reporting you want to use, 
then label ALL tapes.

Pierre Cayé

-----Message d'origine-----
De : ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] De la part de 
Richard Sims
Envoyé : jeudi 3 mai 2007 02:01
À : ADSM-L AT VM.MARIST DOT EDU
Objet : Re: [ADSM-L] 8 char volser in 3584

On May 2, 2007, at 7:45 PM, David E Ehresman wrote:

> No data on these tapes.  They are scratch 3592s.  They were in the
> 3584 as six characters.  I checked them out, remove=no, to leave them 
> unclaimed in the 3584.  I then switched the 3584 to 8 characters and 
> checked them back in to tsm as scratch tapes.  tsm still sees them as 
> 6 characters.  Do I have to physically removed them from the library, 
> reinventory to get rid of the 6 characters, then reinsert them to pick 
> up the 8 characters?

David -

IBM Technote 1217789 will be a good reference for your purposes.
Particularly see the last paragraph.

     Richard Sims of Boston University