Messages in this thread |  | | Date | Sun, 8 Oct 2000 09:53:26 -0600 | From | "Jeff V. Merkey" <> | Subject | Re: Tux 2 patents |
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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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