We had a similar problem with 3.7.3.8@MVS and import/export
Solution was changing tapeiobuffersize back to 1 (default) 

Regards,
Stefan Holzwarth

> -----Ursprüngliche Nachricht-----
> Von: Nilsson Niklas [mailto:ninil AT WMDATA DOT COM]
> Gesendet am: Dienstag, 10. April 2001 11:22
> An: ADSM-L AT VM.MARIST DOT EDU
> Betreff: DSMSERV UNLOADDB on S/390 running TSM 4.1.3
> 
> Hi!
> 
> Has anybody had problem doing a unloaddb on an S/390 system 
> running 4.1.3???
> We are trying to do a unload to tape but when the tape get 
> full, the TSM
> don't mount next tape.
> Tried to do this to 3390-disc but got the same problem , when 
> the disc get
> full , "he" unmounts
> the disc but never mounts the next one.
> There is no problem if you do an export to a deviceclass=file 
> or tape when
> server is up and running.
> 
> Regards
> Niklas
>