On Jul 5, 2010, at 4:50 AM, Alan Buxey wrote: >> ==> Blades didn't move for months if not years for some ! Plus, diags passed >> fully without any kind of problem ! > > we had an issue earlier this year when the temperature of a data > centre went up by 3 degrees and cooled repidly. yep. reseating the blade > fixed it. hmmm. :-)
Thermal cycling is a fact of life, as is vibration and connector corrosion. Yes, 3 degrees doesn't seem like much, but at the microscopic scale, it's more than enough to cause boards (and parts!) to expand and contract. When you combine that with the continual vibration of fans, and corrosion from general atmospheric contact, Bad Things can and do happen. Tony _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
