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- Path: sparky!uunet!paladin.american.edu!gatech!news.ans.net!cmcl2!rlgsc.com!gezelter
- From: gezelter@rlgsc.com
- Newsgroups: comp.os.vms
- Subject: Re: VMS file structure?
- Message-ID: <1993Jan25.164439.345@rlgsc.com>
- Date: 25 Jan 93 16:44:39 EST
- References: <C16JI3.4Ln@nmrdc1.nmrdc.nnmc.navy.mil> <1993Jan22.091333.1@v7.vitro.com>
- Organization: Robert Gezelter Software Consultant, Flushing, NY
- Lines: 47
-
- In article <1993Jan22.091333.1@v7.vitro.com>, vaxs09@v7.vitro.com writes:
- >
- > ...
- > Under VMS you don't normally have to specify block or record sizes. You
- > never have to specify block size for disk files. On disk, the block size
- > is always 512 bytes.
- >
- Not necessarily so. Disk blocks are always 512 bytes (1 pagelet
- for ALPHA fans). However, files can, and often do, have record
- lengths (and hence block lengths in the IBM terminology) greater
- than a single disk block/pagelet.
-
- > ...
- >
- > The real TCP/IP packages running on VMS systems (Wollongong's WIN/TCP,
- > TGV's Multinet and others, but not DEC's UCX) have a private operating
- > mode. They recognize each other and automatically switch into a
- > "RMS transfer mode".
- >
- > When you're going from one VMS system to another, don't worry about it.
- > The file will be copied bit-for-bit identical and the file organization
- > (fixed length, variable length, stream, etc) will be preserved.
- >
- > I wouldn't try it with indexed files though.
- >
- However, if you first use BACKUP to create a saveset of the file,
- you will be able to do the transfer with a minimum of pain (it
- will appear to be a normal binary file).
-
- > John Briggs vaxs09@v7.vitro.com
- --
- John,
-
- Good post, my apologies to everyone for not responding to the
- entire query.
-
- If I have been unclear, or if I can be of further assistance,
- please feel free to contact me by Email or phone.
-
- - Bob
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