The easiest way to check for 'allowance' to overwrite is to query the 
'recyclable' flag for the volume. 

  mminfo -q "recyclable" -r "volume" > outfile

You may of course also use your more complicated query. 
However, instead of "savetime" let me suggest to use the retention date 
(ssretent). If you have multiple retention periods, this is the only parameter 
you can rely on.

You commands should look like this:

  mminfo -q "volume=<volname>" -r "client,name,level,savetime,ssretent" -ot 
-xc, > outfile

Do not forget that you must use one command per volume. 
You may omit unnecessary parameters in the '-r' section.

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