10-31-2013 01:59 PM
Greetings! I have an FCX648-HSPOE with a fan that is acting a little squirrely repeatedly switching the fan speed from 1 to 2 and back over and over...We have ruled out any environmental issues, AC/cooling is good, airflow in and around the rack is nornal, and power is normal. The <sh chassis> command shows me that the temperature readings (even when fluctuating) are falling below my thresh hold settings, and I have compared everything to a couple of our other devices we have in the same rack which are issue free - so essentiall, everything looks normal. Before I open a case with Brocade support I was hoping someone could clarify what exactly 'MAC temperature' is referring to in the <sh chassis> output?! The CPU temp is obvious, but I cannot find any reference to what the MAC temp specifically gauges? A couple of the config guids, installation guides, and some internet searching do not pull up anything specific either (although I am guessing it is either 'memory temperature' or 'voltage temperature'. Any ideas are greatly appreciated!!
MAC 1 Temperature Readings:
Current temperature : 53.5 deg-C
MAC 2 Temperature Readings:
Current temperature : 60.5 deg-C
CPU Temperature Readings:
Current temperature : 47.0 deg-C
Warning level.......: 85.0 deg-C
Shutdown level......: 90.0 deg-C
10-31-2013 02:06 PM
Update - I contacted Brocade Tech Support and they were unable to tell me what the MAC temperature referred to beyond 'an internal temperature indication'. I actually have access to a Brocade 'Premier Plus' support engineer and he indicated that it refers to air flow 'zones' (input/output) in the devices and changes per the device family. I have never read that in any of the Brocade literature - and would love a MORE specific indicator!
*You specifically referenced a MAC 'chip' - that adds another target: CPU, MAC chip, air flow zones, 'memory'....
10-31-2013 02:22 PM
Im not exactly sure what the exact reference is here. It could be the ASIC on board or could be a sensor on the MAC chip. Let me check with someone in engineering and try to get an answer for you.
01-06-2014 09:55 AM
I was just wondering if this has been answered. I have several FCX stacks and a few stand alone FCX, I notice this same behavior only on the stacks that have 7400 firmware. I have rolled back a couple of stacks to an older firmware (7202e) so my log doesn't fill up in a day or two with automatic fan changing back and forth.