On 09/17/2014 08:20 AM, Vallevand, Mark K issued this missive:
Tried replacing the switch with a crossover cable. The problem goes
away. It looks like there is some odd delay in the switch. The NIC is
configured, but it takes 4 seconds for the link to go up. Huh.
We have a dedicated network for all the cluster traffic. Nothing else
uses it. In the two-node case, we use a cable. In larger clusters we
will use a switch. First delivery is for two-node clusters. But, I
worry about that slow switch.
Switches have to negotiate speeds, protocols, check for conflicting MACs
and several other things (depending on the switch/router). It is
possible for that to take a couple of seconds.
I'll bet that if you unplug the cable from the switch, then plug it
back in, you'll probably notice a slight delay in the port's link LED
lighting up as well. Pretty common and not necessarily indicative of a
problem.
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