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. ---------------------------------------------------------------------- - Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx - - AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 - - - - Never put off 'til tommorrow what you can forget altogether! - ---------------------------------------------------------------------- -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
