C9500 fan loud noise problem

[lhsu12001]

hello,

Hello. I bought c9500-24y4c-a model.

firmware: 16.12.3

config: factory default, no connect port

our problem is fan operation noise is too loud.

I know that it only makes a loud noise when booting, and it becomes quiet when booting is complete.

I tried replacing power unit and device. However, it was not resolved.

fan and cpu status, no problem.

below is power and cpu status

switch#show power
Power Fan States
Supply Model No Type Capacity Status 0 1
------ -------------------- ---- -------- --------- -----------
PS0 C9K-PWR-650WAC-R AC 650 W fail N/A N/A
PS1 C9K-PWR-650WAC-R AC 650 W ok good N/A

Fan Fan States
Tray Status 0 1 2 3
------ ---------- -----------------------
FM0 ok good good good good
FM1 ok good good good good

switch#sh processes cpu
CPU utilization for five seconds: 0%/0%; one minute: 0%; five minutes: 0%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
1 0 32 0 0.00% 0.00% 0.00% 0 Chunk Manager
2 1008 4199 240 0.00% 0.00% 0.00% 0 Load Meter
3 0 1 0 0.00% 0.00% 0.00% 0 PKI Trustpool
4 26 13 2000 0.00% 0.00% 0.00% 0 RF Slave Main Th
5 0 1 0 0.00% 0.00% 0.00% 0 Retransmission o
6 0 1 0 0.00% 0.00% 0.00% 0 IPC ISSU Dispatc
7 0 1 0 0.00% 0.00% 0.00% 0 RO Notify Timers
8 4 700 5 0.00% 0.00% 0.00% 0 VIDB BACKGD MGR
9 5549 2848 1948 0.00% 0.02% 0.00% 0 Check heaps
10 25 350 71 0.00% 0.00% 0.00% 0 Pool Manager
11 0 1 0 0.00% 0.00% 0.00% 0 DiscardQ Backgro

switch#sh processes memory
Processor Pool Total: 1912683576 Used: 277218336 Free: 1635465240
reserve P Pool Total: 102404 Used: 88 Free: 102316
lsmpi_io Pool Total: 6295128 Used: 6294296 Free: 832

PID TTY Allocated Freed Holding Getbufs Retbufs Process
0 0 266353288 57197320 188441600 461 13286 *Init*
0 0 584 1495600 584 0 0 *Sched*
0 0 78931104 61065920 14753096 11 7 *Dead*
0 0 0 0 658104 0 0 *MallocLite*
1 0 1307472 22672 1323528 0 0 Chunk Manager
2 0 43648 448 61144 0 0 Load Meter
3 0 0 0 53944 0 0 PKI Trustpool
4 0 20698704 103400 20455112 3 3 RF Slave Main Th
5 0 0 0 29944 0 0 Retransmission o
6 0 0 0 29944 0 0 IPC ISSU Dispatc
7 0 0 0 29944 0 0 RO Notify Timers
8 0 0 0 29944 0 0 VIDB BACKGD MGR
9 0 8832 448 38328 0 0 Check heaps
10 0 24287152 24307584 216240 51 0 Pool Manager
11 0 0 0 29944 0 0 DiscardQ Backgro
12 0 448 448 29944 0 0 Timers
13 0 0 0 17944 0 0 WATCH_AFS
14 0 0 0 29944 0 0 IOSXE heartbeat

[Georg Pauwen]

Hello,

do you have an option to use two power supplies at the same time ? Others have reported noisy fans with only one power supply, with two, the fan noise disappears...

[lhsu12001]

Hello, Georg

Thanks your quick reply.

I turned off the power and connected an additional 1 power supply.

but, same problem occurred.

switch#show power
Power Fan States
Supply Model No Type Capacity Status 0 1
------ -------------------- ---- -------- --------- -----------
PS0 C9K-PWR-650WAC-R AC 650 W ok good N/A
PS1 C9K-PWR-650WAC-R AC 650 W ok good N/A

Fan Fan States
Tray Status 0 1 2 3
------ ---------- -----------------------
FM0 ok good good good good
FM1 ok good good good good

 what's your firmware version?

I will apply the same firmware version as you, and if the symptoms are the same,

I will contact TAC.

Thanks,

[lotr · Accepted solution]

Hi. I am having the exact same issue as you. We recently purchased a C9500-24Y4C-E that came with version 16.9.5 and 2 x Power Supply slots. Once I power it on, the fan on the PSU runs constantly at 100% and generates enormous loud noise. I have verified that LED indicator on both PSUs and FAN trays are Green when both power cables are connected.

Have you been able to solve this? Or could you kindly share TAC feedback if you got any?

Thanks!

[lhsu12]

hi, lotr

Unfortunately we haven't solved our problem yet.

We've already installed the switch, so we'll check back on the issue later.

Thank you for your interest in my problem.

If you solved the problem, I would appreciate your answer

[shaneungos3352]

Has anyone else had this issue or found a solution?

[rooki3]

I can confirm we are also having same problem, the fans are too loud. We have two C9500-24Y4C and both of them have loud noise. Were you able to get anything from TAC ?

[k1t0]

We have recently purchased two c9500 (48Y4C) preinstalled with 17.9.4a. Have encountered the same problem. Opened TAC case, sent logs as they required me to do and got an answer that "fan trays (2 times C9K-T1 per switch) are able to do 24k RPM and current speed at 10k+ RPM is perfectly normal." 

Anybody found any other solution? Has anybody fixed it with firmware upgrade - which version?