All the sudden fans are working very loud on Catalyst 4500 switch

[erotar070]

All the sudden fans are working louder than normal ( very, very loud)

I'm going to include the output of the command I used to check the switch:

#show environment
no temperature alarms

Module Sensor Temperature Status
------+--------------------------+--------------------+------------
1 air outlet 50C (59C,71C,79C) ok
1 air inlet 39C (44C,59C,67C) ok
2 air outlet 36C (44C,58C,66C) ok
2 air inlet 36C (43C,57C,65C) ok
3 air outlet 36C (44C,58C,66C) ok
3 air inlet 36C (43C,57C,65C) ok

Power Fan Inline
Supply Model No Type Status Sensor Status
------ ---------------- --------- ----------- ------- -------
PS1 PWR-C49M-1000AC AC 960W good good n.a.
PS2 PWR-C49M-1000AC AC 960W good good n.a.

Power supplies needed by system : 1
Power supplies currently available : 2

Chassis Type : WS-C4900M

Power consumed by backplane : 0 Watts

Switch Bandwidth Utilization : 0%

Supervisor Led Color : Green

Module 1 Status Led Color : Green
Module 2 Status Led Color : Green
Module 3 Status Led Color : Green

Fantray : Good
Fantray removal timeout : 109

Power consumed by Fantray : 120 Watts

#show power
Power Fan Inline
Supply Model No Type Status Sensor Status
------ ---------------- --------- ----------- ------- -------
PS1 PWR-C49M-1000AC AC 960W good good n.a.
PS2 PWR-C49M-1000AC AC 960W good good n.a.

Power supplies needed by system : 1
Power supplies currently available : 2

Power Summary Maximum
(in Watts) Used Available
---------------------- ---- ---------
System Power (12V) 658 960
Inline Power (-50V) 0 0
Backplane Power (3.3V) 0 0
---------------------- ---- ---------
Total 658 960

The left side of that switch is warmer than the right side, please let me know what it could be the issue and how to resolve it ?

[Reza Sharifi]

Check your cooling system, and make sure the entire room, rack, or cabinet is getting enough cold air. It may be that one side of the system is not getting enough cool air. 

HTH 

[erotar070]

There is an AC unit that is cooling down the switch 

[Reza Sharifi]

Make sure the fans or the fan tray are not being blocked by anything and are not dirty. Sometimes if the fans are very dirty, they have a hard time exhausting the hot air out, and that keeps the system warm.

HTH

[Flavio Miranda]

Hi

 Show proc cpu hist ?

[erotar070]

Show proc cpu hist

444445555544444444445555555555444444444444444444444444444444
100
90
80
70
60
50
40
30
20
10 ***** **********
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per second (last 60 seconds)

856555556555555555555555555555555555556555555555556555555555
100
90
80
70
60
50
40
30
20
10 **********************************************************
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per minute (last 60 minutes)
* = maximum CPU% # = average CPU%

1
886686666666666654
100
90
80
70
60
50
40
30
20
10 ******************
0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..
0 5 0 5 0 5 0 5 0 5 0 5 0
CPU% per hour (last 72 hours)
* = maximum CPU% # = average CPU%

[Flavio Miranda]

Is not processing. If you were running into a loop or any starving cpu process, it should show with this command.  Could be  a hardware problem.

 How about the uptime?  Maybe a reload can sort things out.

[erotar070]

We restarted that switch and didn't help.

[balaji.bandi]

Can you post below:  Do you see any LED indications ?

show environment [ alarm | cooling | status | temperature ]

[erotar070]

No, I don't see anything that indicates any issues

[Leo Laohoo]

What IOS is the switch on?

[erotar070]

Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-ENTSERVICESK9-M), Version 15.1(2)SG5, RELEASE SOFTWARE (fc1)

[Leo Laohoo]

For the 4500/4900M, the fan speed comes in two options:  OFF or LOUD.  

There is no settings or sensors to enable the fans to perform variable speed.  

[marce1000]

   - Connect to the 4500 with : https://cway.cisco.com/cli , then at the top left , press or run System Diagnostics.

 M.