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- Newsgroups: bit.listserv.ibm-main
- Path: sparky!uunet!uaisun4!mrl
- From: mrl@uai.com (Mark R. Ludwig)
- Subject: Labeled tapes under *ix (was Re: UNIT and VOLUME specification)
- Message-ID: <MRL.92Jul31085829@sun4.uai.com>
- Sender: mrl@uai.com (Mark R. Ludwig)
- Organization: Universal Analytics, Inc., Torrance (LA), CA
- References: <IBM-MAIN%92073103343302@DEARN>
- Date: 31 Jul 92 08:58:29
- Lines: 47
-
- In article <IBM-MAIN%92073103343302@DEARN> Mike Ellwood
- <MWE@IBM-B.RUTHERFORD.AC.UK> writes:
-
- HOWEVER!! - the one thing *ix doesn't have, and could surely use,
- is decent tape (and I think I mean tape label) handling, a la
- MVT/MVS.
-
- Does anyone know if AIX will ever provide this? (And if this means
- deviating from "standard UNIX", well - tough!
-
- This is one of the first things which frustrated me too, having grown
- up with MVT, MVS, TOPS-20, and VMS. In order to answer the question,
- I think it's important to understand the operational axioms under
- which this stuff makes sense.
-
- If you have the traditional mainframe environment (i.e., one or more
- *ix systems in a secured clean room with users remotely accessing the
- horsepower/graphics), then you have a legitimate need for such formal
- tape mounting procedures. It's not very hard to "layer" such
- procedures on top of *ix. In fact, it's not clear that there's even
- any way to "ingrain" the procedures in the system. The *ix system
- doesn't care what tape is on (in?) the drive. It only cares that each
- operation attempted is allowed by the protections of the device
- (generally in the /dev directory). To get the same sort of support on
- *ix which one has with IBM labeled tapes, you'd probably implement it
- as an extension of the file system, the way VMS does it. I would not
- be surprised if it's already been done. If you have access to Usenet,
- you might try posting on comp.unix.admin for such a thing. If you
- don't have access, send me mail, and I'll post for you. It would
- surprise me even less if IBM is working on something right up this
- alley. The mainframe AIX people have to be worried about reading and
- writing labeled tapes if they want to stand next to MVS.
-
- (I've never delved into it, but I have the impression that IBM labeled
- tapes are mighty similar to ANSI labeled tapes. Is it just the
- character sets which are different?)
-
- The scenario above is in stark contrast to the environment in which
- most *ix systems exist. They are designed as desk-top or desk-side
- workstations. The cost to extend the keyboard and graphics cables
- from a central spot to the user's desk is not small. When the tape
- drive is next to the user, it doesn't generally make much sense to add
- formal tape mounting procedures.$$
- --
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