[rescue] quad head pci video cards

Nick B. nick at pelagiris.org
Sun Jan 25 18:31:43 CST 2009

Uhm, to clear up confusion, O2k/o200/o3k/o300 All use craylink every time you go
between CPU Nodes.  I'm not sure about the o3k/o300 pci nodes and such, but
I would assume they also hook up via CrayLink.  I'm told if you ran a cable from
an o2* series to an o3* series it would work electrically, though I suspect the
firmware would shit a brick.
On Sat, Jan 24, 2009 at 05:24:14PM +0000, Mike Meredith wrote:
> On Mon, 5 Jan 2009 17:31:55 -0500, Joshua Boyd wrote:
> > Do you recall, were the moster rack sized CrayLink routers used
> > at all?  Was CrayLink used between racks, or was it strictly HIPPI
> > between racks?  I'm just curious how the really big systems (above 128
> > CPUs) were built.
> Just cleaning up my mail folders, and found this which I don't think
> was answered on list. Just in case ...
> O2K's _did_ use CrayLinks between racks (at least they did if you
> wanted multiple racks to look like a single system). In fact I think
> that the two 8-cpu modules in the rack were also linked with CrayLink
> cables, but possibly not at the bottom of the rack.
> Pretty thick dinosaur cable it was too ... I remember it was quite a
> bit of work getting two racks connected and keeping the cables neat.
> I think you could get up to 4 racks connected without a router rack (64
> processors). The published maximum size of an O2K system was 128 cpus,
> but a number of sites went further by (?) using custom routers.
> -- 
> Mike Meredith (http://zonky.org/)
> 'I met the well connected, the powerful and the rich; I saw little to
> envy or, indeed, much to admire;B we were being lionised by a class of
> society with which we had little in common'B --- Edmund Hillary
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