Tim,

I forwarded this one to the lawyers.  

Thanks

Jeff

Timothy Roscoe wrote:
> 
> For what it's worth, the system was called "Jackdaw" and was written by
> Mike Challis.  It was in extensive use on the University's MVT/MVS/MVSXA
> mainframe for many years as the database for holding user information.  The
> document Alain's got is probably Computer Laboratory Technical Report no. 1
> (yes, One!).
> 
> If it isn't, and you need it, see
> 
>      http://www.ftp.cl.cam.ac.uk/ftp/papers/reports/TR.txt
> 
> Jackdaw was phased out when the mainframe was decommissioned about 5 years
> ago. Mike's still around, but I think he's retired.
> 
>   -- Timothy
> 
> At 10:00 PM 10/5/00 +0000, Alain Williams 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
> >
> >--
> >Alain Williams
> >-
> >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> >Please read the FAQ at http://www.tux.org/lkml/
> 
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