[Beowulf] strange PXE reboot behavior

Geoff Galitz galitz at berkeley.edu
Wed Sep 15 13:13:11 PDT 2004

Hello folks,

We have a strange problem.  We have 20 nodes with SE7501CW2
motherboards, and about 5 of them seem to fail their POST and reboot
only when the gigabit NIC is plugged into a gigabit switch.  If we
unplug it, the node functions normally.  If we plug it in after the 
comes up, it crashes immediately.

My only thought at this point is auto-negotiation, but I cannot seem to
turn off auto-negotiation on these motherboard/NIC combos.  Ethtool 
to change the parameters on the cards.

Any other ideas?



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