Mario. wrote: > Yest, porting EMC2 to the s/390 or z/990 consists of two parts. You > have to separate the ordinary linux part and the realtime part. The > realtime and I/O part may require rewriting due to the fact that for > I/O you need to use a specific I/O card, good news is that these cards > are highly intelligent by themselves so they could perform a variety > of tasks. > Ah, yes, we could, of course, use a multiplexer channel to handle I/O, and either hack a comm controller, or alter my FPGA to handle bus and tag protocol. That would certainly be an interesting project. The IBM systems architecture is quite unlike how a PC works in many ways, most especially how the channels are programmed by the application program to perform I/O the way the user wants it, rather than how the system does it, and it better be good enough for you. I wonder how much of that is compatible with Linux. I would guess not much at all. A massive security hole, and anybody can write a channel program that monopolizes at least some system resources. (Yes, I know they have the security implications under control, but it adds complexity, and you can never be sure you have every aspect of the hole plugged.)
> I understand that you meant that as a joke, but these "big iron" > computers are good for what they are good for. For terminal access > where you can perform a infrequent high performance computation > requiring much resources, such as is the kernel compilation. I learned computer programming to a substantial extent on IBM 360 mainframes, and was always fascinated by how different the architecture, especially the I/O channels and control units, was from other systems. > > Remember, mainframes were were since the very beginning as fully > virtualised systems, so all realtime timing and such is naturally done > with specialised boards. Oh, the 360 wasn't very virtual at all! It was concurrently multi-user, but just barely. The 370's could get virtual, but at a fairly high cost in overhead. We had some 370/135's that would take 3-4 hours to virtual-IPL an MVS system under VM/370. We used to laugh at that misapplication of systems. Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
