[Beowulf] using extend-reach IB?
hahn at mcmaster.ca
Wed Oct 10 15:05:58 PDT 2007
I've got an situation where a 20-25M IB cable would be very handy,
and as far as I can tell, such cables exist. What's not clear to me
is how they work - I think they all have some form of active components.
some appear to be copper; others fiber, but all seem to draw a few Watts.
I guess they draw from both ends, but do most IB NICs and switches
support this? in my case, I have the usual mellanox infinihost III
cards and Voltaire ISR 9024D-M.
alternatively, do you have any experience with media-converters?
the long story is that I would like to drive some display hardware
in an adjoining room from a parallel rendering cluster at one end of a
machineroom (the wrong end, naturally). it seems quite expensive to
extend dual-link DVI for the total distance (35M or so), so I was
hoping to extend the DDR IB about 20M to the edge of the machineroom,
then use plain old 15M DL-DVI cables for the rest. mixed display
targets, but including one of the new quad-HD panels (3840x2160,
which needs 2x dual-link or 4x single-link.)
thanks, mark hahn.
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