IT Knowledge Exchange Community Update for 01/08/09 - ITKE Community Blog 
0 pts. | Feb 3 2009 3:20PM GMT
[...] >> Half duplex vs. full duplex [...]
Q:
Half duplex vs full duplex
Recently the application running on one of our clusters had problems when some of the servers had problems accessing the NFS storage. The analysis showed there to be a mismatch between the QFE interfaces and the network protocol. The QFEs were operating at half duplex while the network was expecting full. The cluster servers had been rebooted earlier to facilitate a reconfig on the RAID level. I am trying to find out what was left out when the network cards(QFEs) were setup originally that would not show up for two months (these had been rebooted during the turnover process).
ASKED:
Dec 3 2008 6:11 PM GMT
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A:
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At some point an engineer may have set the speed and/or duplex setting to 'auto negotiate' (depends on your vendor). With most cards we use, changes to these settings will not take place until the card is disabled and then re-enabled, as would happen after a reboot. A change to the configuration could easily hide for an extended period without being discovered.
Daniel
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