At one site, we put a process in place to run a LIST TTOC looking for partials, 
generating and running the DELVOL MARKFULL commands before the 
alternates were taken offsite. The main culprit in this case was that command 
level backup (i.e. HBACKDS) does not use the PARTIALTAPE parm for backup; 
this is only used for automatic backup process or a BACKVOL command, I 
believe. Using  INUSE(RETRY) can also cause this issue, since the backup 
retries are queued as command level backups. I do not recall if (or how) ML2 
tapes were affected. 

An alternative might be to use the ARCMDEXT exit and check if Interval 
Migration or PSM is in progress. If the answer to both is no, then I think it 
would be a command level migration of some kind and the output could be 
directed to DASD rather than TAPE.  You would need to set a RC=36 or 40 in 
the exit, depending on whether you want the dataset to be compacted on 
DASD or not. More information on the ARCMDEXT can be found at:

http://publibz.boulder.ibm.com/cgi-
bin/bookmgr_OS390/BOOKS/DGT2C760/6.10?
SHELF=EZ2ZO10L&DT=20080603102513

Hope this helps in some way.

Chris Taylor

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