Gary advised...
>See TAPECOPY on Jazz

Notice that TapeCOPY does not "know" about the tape formats
and thus does a raw copy. For reel-to-DDS this will mean one
DDS cartridge per tape reel... (quite inefficient media use)

To overcome this "issue" I have used the following "trick"
a few times in the past: first TapeCOPY the reel contents to
disc files (uses one disc file per reel, eg reel#.grp.acct
or HFS style /ARCHIVE/PUB/topic/reel#) and then store those
disc files to a single DDS cartrige.

This way one can usually combine all reels of a store set,
or even multiple different store sets to a single DDS, which
gets reasonably filled.

Downside: extracting files is also a multiple-step approach,
i.e. restore reel-file from DDS, use TapeCOPY to recreate
the store tape on another DDS (temp/scratch) and finally do
a restore of the desired fileset from that "auxiliary DDS".

So it only makes sense to use this approach when you need to
access the archived data *very* infrequently (or have to take
the route using free tools instead of buying X-Over or alike).

Lars.