CrayLink connections between Origin 2000s

On 18/12/2007 01:04, Dave McGuire wrote: That's not a reliable criterion, because some Origins also have the expanded Base I/O module with mouse, keyboard, audio and video (at least, some rackmount ones do). Richard is correct; the essential difference is that the midplanes and board sets are different. Looking from the back, an Origin deskside has space for 4 node boards at the left, then the Base I/O module and PCI box (if fitted) and then 12 XIO slots (for 12 half-height or 6 full-height boards) on the right. An Onyx can have only two node boards, then a graphics board set (3 or 4 boards depending on how much raster memory it has), then the Base I/O unit and PCI box, which are much further over than they are in an Origin, and 5 XIO slots (3 full-height or 5 half-height boards). This isn't true in a rackmount system, because a rackmount Onyx2 has a module with 4 node boards (same module as an Origin) in the bottom, and a different graphics module with no node boards, Base I/O, or PCI, but two sets of graphics with up to six raster memory cards in total, in the top. -- Pete Peter Turnbull Network Manager University of York