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List:       mumps-l
Subject:    Re: Restoring M11+ Data
From:       "James R. Prine" <jamesp () WVI ! COM>
Date:       1998-11-05 5:54:09
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I had some tape that was used on a PDP 11/44 in 1984 to save a database from
a DEC DSM system and managed with the help of a specail collegue to recover the
old 9 track 800 BPI info  in 1994.  10 years it not bad and the storage
conditions
were not the best.   Hope this helps.
  James R. Prine DVM  Veterinary Pathologist
    jamesp@wvi.com

Jim Self wrote:

> What is the shelf life of data on these tapes? I would expect that you might
very
> well find significant degradation of the data on the tapes over 6 years, but
I
> don't know. I am pretty sure that I read somewhere that data on magnetic
media
> has a short shelf life and should be periodically refreshed if valuable. I
> believe that in the case of floppy disks, for instance, this is no more than
2 or
> 3 years.
>
> Even if the data is still intact, I think you would need a special program to
> load the old data because it would have probably been in a form that was
specific
> to your old disks. I don't remember very well, but I think you had a choice
of
> tape formats and not all of those were directly readable on other systems.
>
> We converted from M11+ to DTM over 8 years ago and transferred the MUMPS data
> using Exabyte. We used %GOQ to put the data to tape in a sightly more
portable
> format than the standard backup and we still had to decode the data blocks.
>
> astlej@my-dejanews.com wrote:
>
> > I have some Exabyte tapes from an old M11+ system that are about 6 years
old.
> > We used to use the backup utility that came with M11+ to backup to them.
> > Does anyone know how I can now restore that data onto a system running MSM
> > v4.0.14. ?
> > I have tried a straight open and read but all as I get is Null data.
> > Does anyone know the tape format that it used to use?
> >
> > Thanks
> >
> > John Astle
> >
> > -----------== Posted via Deja News, The Discussion Network ==----------
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