On Sun, Oct 08, 2000 at 03:49:20PM +0000, John Alvord wrote:
> On Thu, 5 Oct 2000 22:00:58 +0000, Alain Williams <addw@phcomp.co.uk>
> wrote:
>
> >Hi,
> >
> >I remember when at the University of Cambridge (in England) about 25 years ago
> >seeing some work then about the Jackdaw (or was is Jackard) database system
> >that had the great feature of being immune to OS crashes, it used a phased
> >update mechanism where new blocks were written to disk and the last block
> >written was the one that contained the switched pointer, until this last block
> >had been written the changes had not been made. Since the write of a disk block
> >was atomic the database would never be corrupt.
> >
> >If someone wants I think that I still have a (paper) copy of the report describing
> >this. I can send/fax a copy if wanted.
> >
> >I don't subscribe to this list, so please reply direct if someone wants it.
> >
> >(Please don't request a copy just out of curiosity since I don't want to have
> >to post/fax copies that won't help resolve this case by showing prior art.)
> >
> >Cheers
>
> The VM/CMS operating system had a new file system around 1979 or 1980.
> It had exactly the same characteristics... writing the new blocks and
> then writing a final block which changed the world. The work was
> derived from Chris Stephens' work on YMS (Yorktown Monitor System).
> Since Chris was part of IBM Research, and since researchers got major
> brownie points from patents, I bet that the there are some patents to
> be found of interest.
>
> Clearly, the same idea has been rediscovered over and over again. The
> VM/CMS case would be a good example of prior art, since it had
> thousands of licenses and hundreds of thousands of end users in the
> early 1980s.
>
> john alvord
John,
Thanks. I'll forward this on.
Jeff
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