Hello IBM-MAIN people,
We recently have installed a new IBM Tape Library (without a VTS) to
replace a very old STK Silo; so we are migrating our tape usage from 3490's to
3590's - about a hundred-fold increase increase in capacity per cartridge (and
will have many fewer cartridges!)! This change in technology has forced us to
change all of our tape jobs - in some cases, like backups, it is very straight
forward (take 40 odd jobs, create one job that "stacks" all of backups onto a
single tape); some jobs/processes are not so easy!
One of our difficult processes is the JES2 OFFLOAD. Every weekday night (at
18:30) we start the offload of production output to tape (with PURGE). Before
the new tape library, this would take less than a full 3490 cartridge (and it
still takes less than a full 3590 cartridge - a very small fraction of a
cartridge and a lot of waste). From my reading of the JES2 commands, it seems
that JES2 OFFLOAD can not deal with file sequence numbers (more than one file
per tape). Currently, we keep the offload on tape for 60 days. I would like to
get some feedback from others on the list as to what they do for JES2 OFFLOAD.
Is anyone using the OFFS= parameters in commands, and how (I would like to see
command sequences).
One of the questions I have is, can JES2 append to an existing OFFLOAD tape?
I would like to be able to mount the same tape for month (roughly 20 working
days). I know that as job numbers roll over 9999 to 1 I might get into the slim
possiblity of JOBNUM/JOBNAME conflicts on restoring the output.
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