On Fri, 6 Sep 1996, Barry Fruchtman wrote:
> Right. We require pre-labelled to prevent overwriting
> of tapes which don't belong to ADSM and to track them
> once ADSM has used them ( or to re-use them when they become
> empty ).
I'm having a problem with ADSM database backups prompting for
scratch volumes: I _DON'T_ want to use _ANY_ scratch volumes, but when I
run ADSM in roll-forward it only accepts scratch volumes for the
incremental DB backups. I can specify a backup device class and volume
name when I manually perform fulls. How do I set ADSM to perform
unattended database backups to a pool of non-scratch media dedicated to
them? I'm considering having, say, 4 labeled tapes dedicated to DB
backups in a tape library, and those tapes will _NOT_ be part of any
storage pools migrated to by the backup pool.
> Barry Fruchtman
> ADSM Development
> > Basic questions I have:
> > -Does each tape with ADSM has to be labeled whether it will be used
> > as a scratch tape or not?
Yes. It needs to be labeled so ADSM can read its label and know
how to tell the database where your files are.
> > -If I have a tape and ADSM loads it as a scratch tape how will ADSM
> > now not to start from the beggining the next time?
I don't think I understand the question entirely, but from what I
think I am seeing, the DB knows all and sees all when it comes to the
ADSM media (which is why the DB is roughly 2-5% of your total data
capacity). When a request comes to, say, restore from a particular
tape, it will prompt for that tape, whether it is scratch or not.
Personally, I find scratch tapes a bit of a hindrance. I prefer
to have my tapes labeled and in pools so I can keep track of the tape's
condition, contents, etc. It may take a few more mouse clicks or
keystrokes (which can always be put in a script) to add volumes to
storage pools, but it's well worth it.
> > This is what I understand so far. If a tape is labeled, but one has
> > not created storage pool for it, ADSM will mount it and use it as a
Other way around: you create the storage pool FIRST and add tapes
to it (most of the time).
> > scratch tape (if the library has scratch volumes enabled). Once there
> > are no more files needed from that tape ADSM will drop the volume and
> > it can be re-used from "scratch" again. Is this the case? I have
> > tried reading the documentation, but I am still not clear.
I suppose that's correct, but I haven't waited long enough for
scratch tapes to expire. I just have 2 tape drives and I let the ADSM
system handle data consolidation among the tapes.
Matt
IBM infoSage system admin
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