In regard to: [Networker] Scanning w/a Library, dwojcik said (at 3:16pm on...:
Several files have been deleted, and we neet to get at some data. Great.
That is what the software is for. But, save sets have expired, and the
files involved are not browsable. Okay- we can deal with this. We can
scan the tapes manually, and things are looking good, except for having
to scan, re-scan, and then re-scan in tape order. Others have
complained about this, and I agree, but that is not what I am being
frustrated by...
If you still have the client index on tape you can avoid the scan
completely.
I dislike the exceedingly manual process... having to use any number of
work arounds to deal with the fact that "scanning" is an individual
tape-oriented process, in a system designed with a library-centric
perspective
Scanning is kind of a dinosaur -- it quit evolving back in the days
when tape libraries were less common. While it's handy in a pinch to
be able to run scanner in a minimal environment with no library, I agree
that it would be nice if scanner evolved to *also* be able to play well
in an environment with a library.
Still, there are reasons why you don't want scanner to try be too helpful.
For example, let's say you only need to scan in one or a few savesets that
are on one tape, but you're inexperienced or in a rush or make a mistake
and you don't specify exactly which savesets you need to scan. You tell
scanner to "scan this volume", and you go off to work on other tasks.
scanner scans the volume (loading the index entries for the savesets you
care about) but when it gets to the end, there are one or more savesets
that continue on some other volume, so scanner automatically loads that
volume and continues. Picture kind of a "sorcerer's apprentice" situation,
where when you come back to see what scanner has done, you realize it's
scanned half your library and is still going.
What is the right way to scan tapes with a Library, instead of against
the library? Am I explaining my self well enough here or not?
Currently, scanner just doesn't do what you're interested in. The good
news is that there are plenty of situations (whether by luck or by careful
planning) where scanning isn't even needed because the index you need can
be re-loaded from tape using nsrck -L7.
Tim
--
Tim Mooney Tim.Mooney AT ndsu DOT
edu
Enterprise Computing & Infrastructure 701-231-1076 (Voice)
Room 242-J6, IACC Building 701-231-8541 (Fax)
North Dakota State University, Fargo, ND 58105-5164
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