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Re: BGP Problem on 04/16/2007
On Apr 19, 2007, at 12:52 PM, David Temkin wrote:
Nah, I wasn't thinking of them -- post-traumatic memory loss allowed me to forget them... There was someone else who's name I have managed to forget who tried to do the same thing through 4 parallel SCSI connectors and fancy OS software -- it was horrendous.. There were 2 motherboards in a case (driven by the same, non-redundant, non- swappable PSU!) and each motherboard had 2 dual channel SCSI cards with cables stretched between the cards. Fancy drivers exposed each board's RAM to the other machine -- there was also a 10Base-2 cable (I'm dating myself here) between the mother-boards for coordination and communication. Every now-and-then your application was supposed to make a system call that would cause the machines grind to a halt and compare their memory -- if there was a difference, the syscall would return non-zero and leave you to figure out what to do about it -- unfortunately because there were only 2 machines voting there was no way to know who was right and who was wrong -- the vendors suggestion was to a: reboot or b: "just choose one and hope you guessed right". Wildly broken system...
I cannot find any of my docs on the system that I was originally talking about, but it was 3 PPC cores in a single package -- there was built in hardware to keep them synchronized and voting. AFAIR, it was a drop-in replacement for the "normal" version of the same device, modulo the power-draw.
Maxwell Technologies makes a triple modular redundant cPCI board with SOI processor and rad tolerant FPGAs that is really nice -- somewhere I think I still have a stash of them...
NB: The above mentions 10BASE-2 and cPCI (which will fit in certain vendors hardware) which *just* managed to keep this on-topic -- hopefully :-)
If the bad guys have copies of your MD5 passwords, then you have way bigger problems than the bad guys having copies of your MD5 passwords.
-- Richard A Steenbergen