Messages in this thread |  | | Date | Mon, 09 Oct 2000 11:13:52 -0700 | From | Timothy Roscoe <> | Subject | Re: Tux 2 patents |
| |
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 >the body of a message to majordomo@vger.kernel.org >Please read the FAQ at http://www.tux.org/lkml/
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |