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- From: vulture@carrion.cc.ic.ac.uk (Thomas Sippel - Dau)
- Newsgroups: comp.misc,comp.unix.admin,comp.unix.large,comp.sys.sun.admin
- Subject: Re: Any clues about IBM mainframe tape conversions?
- Message-ID: <1992Sep2.195447.14881@cc.ic.ac.uk>
- Date: 2 Sep 92 18:54:47 GMT
- References: <1992Sep2.125218.11643@galileo.cc.rochester.edu>
- Reply-To: cmaae47@cc.ic.ac.uk
- Organization: Imperial College of Science, Technology and Medicine
- Lines: 51
- Nntp-Posting-Host: cscgc
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- In article <1992Sep2.125218.11643@galileo.cc.rochester.edu>, kann@troi.cc.rochester.edu (Kirk M. Anne) writes:
- -- We have been asked to decommission our IBM VM/CMS mainframe. The committee
- -- that is working on this project has asked me to find out what other sites
- -- do with IBM mainframe tapes for UNIX systems. I know that 'dd' will read
- -- the tapes, but many of our users have SAS tapes that were created on CMS.
- -- I would like to find some clues to the following questions:
-
- You may be in for a shock: On one system here people had SAS tapes which needed
- user intervention when the computer centre changed to different disks, as the
- layout (number of sectors/track etc.) was somehow encoded in the data. It was
- relatively easy for the user to do, but a terrible trap for people who are away
- for a year or so. The computer centre could not reformat the tapes !
- N.B. that was on an MVS system.
-
- -- What do you do when you get tapes from IBM sites?
-
- Use ansitape for DB and FB formats, avoid VB format. Copying the tapes to an
- ansi labelled (rather that standard - i.e. ebcdic - labelled) tape is all
- you need, if you have support for ansi labelled tapes. The system will tell you
- when converting to ansi labelled is inappropriate, such as for load and object
- modules, and for other binary files.
-
- -- What utilities do you use to convert tapes?
-
- A nearby university with a network connection and the relevant system.
-
- -- How do you handle SAS tapes created on CMS?
-
- You need to create export files, which usually conserves the current state
- of the database, but may well lose some history.
-
- -- How do you handle multi-tape data sets?
-
- Very carefully. But it is not such a problem when you have still a native system
- to read them on. A QIC150 cartridge can carry the contents of about 5 phase
- encoded or one group encoded tape, a basic exabyte 10 to 15 times as much, a DAT
- about 8 times. Beyond that you are talking seismic data sets.
-
- It may well be worthwhile to finance a small workstation (a SUN SLC or DECstation
- 3100 is ample) with 2 GB disk and some tape devices just for this. That should
- cost you about the equivalent of a weeks maintenance on the mainframe, if our
- experiences are anything to go by.
-
- Thomas
-
- --
- *** This is the operative statement, all previous statements are inoperative.
- * email: cmaae47 @ cc.ic.ac.uk (Thomas Sippel - Dau) (uk.ac.ic.cc on Janet)
- * voice: +44 71 589 5111 x4937 or 4934 (day), or +44 71 823 9497 (fax)
- * snail: Imperial College of Science, Technology and Medicine
- * The Center for Computing Services, Kensington SW7 2BX, Great Britain
-