> On Mon, 16 Jul 2007 06:57:33 -0700, Dean Kent wrote: > > > > ... I am aware of several companies that offer x86 based > >'mainframe class' systems (for a hefty price), that include a lot of the RAS > >features mainframes are famous for. > > Ha! They are trying, but not even close. x86 processors don't even have > anything like a machine check interruption. Did you know that ever since G6, > the mainframe microprocessors contain two processors that process the same > instruction stream against the same data and compare the results? Guess > wnat happens if the comparison is unequal anywhere along the way.
You were calling me on making assertions without evidence, so it should also apply to your own statements. The companies that I am referring to include all of the RAS features you can mention for mainframes, including lockstep for processors. They do this, however, at a system level exactly because the processors don't have it built in. This is part of the reason the price is so hefty. The problem they have is that they can't scale to the number of users that the mainframe can because of the inherent limitations of the processors/chipsets available. Regards, Dean > > -- > Tom Marchant > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
