DPM will use free tapes before it uses expired tapes. The thinking is that once you overwrite an expired tape, it can no longer be used for recovery, so DPM favors using free tapes first. DPM always pull tapes from the highest slot number first, so a free tape in slot 8 will be used before a free tape in slot 2.
(DPM forum by Mike J)
This is false. Lowest # gets pulled first. Just tested this.
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