3750 Switch Stack Making Noise

[nshinde01]

Hello Experts, 

I have a stack of 4 cisco 3750 switches and its making lot of noise since last one week. Please have a look at the outputs below

S3N-100-ASW1#sh env all

FAN 1 is OK

FAN 2 is OK

FAN PS-1 is OK

FAN PS-2 is NOT PRESENT

SYSTEM TEMPERATURE is OK

System Temperature Value: 31 Degree Celsius

System Temperature State: GREEN

Yellow Threshold : 46 Degree Celsius

Red Threshold    : 60 Degree Celsius

SW  PID                 Serial#     Status           Sys Pwr  PoE Pwr  Watts

---  ------------------  ----------  ---------------  -------  -------  -----

1A  C3KX-PWR-715WAC     xxxxxxxxxxx OK              Good     Good     715/0

1B  Not Present

2A  C3KX-PWR-715WAC     xxxxxxxxxxx OK              Good     Good     715/0

2B  Not Present

3A  C3KX-PWR-715WAC     xxxxxxxxxxx No Input Power  Bad      N/A      715/0

3B  Not Present

4A  C3KX-PWR-715WAC     xxxxxxxxxxx OK              Good     Good     715/0

4B  Not Present

SW  Status          RPS Name          RPS Serial#  RPS Port#

--  -------------   ----------------  -----------  ---------

1   Not Present     <>

2   Not Present     <>

3   Not Present     <>

4   Not Present     <>

S3N-100-ASW1#

Does that denote an issue with power-supply on the switch? Could power supply failure make a switch stack noisy?

[Mark Malone]

Hey

Power supply failure shouldn't cause the noise but a fan on the way out will

Once they start to fail they get louder and louder in switches until they just stop , there easily replaced on a 3750 but I would wait till its gone unless its loud enough to cause issues for users nearby

And Unfortunatly there is no other actual command to confirm which will fail but if you get close enough to each switch you should be able to tell which switch the noise is coming from

[nshinde01]

Output confirms that I have a power-supply failure, right? Do I need to replace it or just a power-cycle/reboot will solve it? 

[Mark Malone]

Yes showing 1 down ,If there hot swappable just try reseat the one that's down currently but if its dead it wont be the one making the noise , sometimes reseating it can fix the issue if its software related , if it does not come back you will need to replace it