[j-nsp] MX80-48T Fan Speed Variation

[Bill Blackford]

MX80-48T
10.2R3.10


I see this in the logs:

Apr  5 07:38:54  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED_MEDIUM:
Fans and impellers being set to intermediate speed
Apr  5 07:39:34  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED: Fans and
impellers are now running at normal speed
Apr  5 07:40:14  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED_MEDIUM:
Fans and impellers being set to intermediate speed
Apr  5 07:40:34  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED: Fans and
impellers are now running at normal speed
Apr  5 07:41:14  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED_MEDIUM:
Fans and impellers being set to intermediate speed
Apr  5 07:41:54  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED: Fans and
impellers are now running at normal speed
Apr  5 07:42:34  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED_MEDIUM:
Fans and impellers being set to intermediate speed
Apr  5 07:42:54  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED: Fans and
impellers are now running at normal speed
Apr  5 07:43:14  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED_MEDIUM:
Fans and impellers being set to intermediate speed
Apr  5 07:43:34  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED: Fans and
impellers are now running at normal speed
Apr  5 07:44:14  mx80 chassisd[1098]: CHASSISD_BLOWERS_SPEED_MEDIUM:
Fans and impellers being set to intermediate speed


So I did some digging:


me at mx80> show chassis fan
      Item                      Status   RPM     Measurement
      Fan 1                     OK       4260    Spinning at normal speed
      Fan 2                     OK       4200    Spinning at normal speed
      Fan 3                     OK       4200    Spinning at normal speed
      Fan 4                     OK       4200    Spinning at normal speed
      Fan 5                     OK       4260    Spinning at normal speed

me at mx80> show chassis fan
      Item                      Status   RPM     Measurement
      Fan 1                     OK       5220    Spinning at intermediate-speed
      Fan 2                     OK       5100    Spinning at intermediate-speed
      Fan 3                     OK       5100    Spinning at intermediate-speed
      Fan 4                     OK       5100    Spinning at intermediate-speed
      Fan 5                     OK       5160    Spinning at intermediate-speed


me at mx80> show chassis environment
Class Item                           Status     Measurement
Temp  PEM 0                          OK
      PEM 1                          OK
      RE 0 Intake                    OK         34 degrees C / 93 degrees F
      RE 0 Front Exhaust             OK         37 degrees C / 98 degrees F
      RE 0 Rear Exhaust              OK         33 degrees C / 91 degrees F
      Routing Engine                 OK         34 degrees C / 93 degrees F
      Routing Engine CPU             OK         54 degrees C / 129 degrees F
      TFEB 0 LU 0 TSen               OK         37 degrees C / 98 degrees F
      TFEB 0 LU 0 Chip               OK         54 degrees C / 129 degrees F
      TFEB 0 MQ 0 TSen               OK         37 degrees C / 98 degrees F
      TFEB 0 MQ 0 Chip               OK         44 degrees C / 111 degrees F
      TFEB 0 TBB PFE TSen            OK         42 degrees C / 107 degrees F
      TFEB 0 TBB PFE Chip            OK         55 degrees C / 131 degrees F
      TFEB 0 TFEB PCIE TSen          OK         38 degrees C / 100 degrees F
      TFEB 0 TFEB PCIE Chip          OK         55 degrees C / 131 degrees F
Fans  Fan 1                          OK         Spinning at intermediate-speed
      Fan 2                          OK         Spinning at intermediate-speed
      Fan 3                          OK         Spinning at intermediate-speed
      Fan 4                          OK         Spinning at intermediate-speed
      Fan 5                          OK         Spinning at intermediate-speed

me at mx80> show chassis environment
Class Item                           Status     Measurement
Temp  PEM 0                          OK
      PEM 1                          OK
      RE 0 Intake                    OK         33 degrees C / 91 degrees F
      RE 0 Front Exhaust             OK         37 degrees C / 98 degrees F
      RE 0 Rear Exhaust              OK         33 degrees C / 91 degrees F
      Routing Engine                 OK         33 degrees C / 91 degrees F
      Routing Engine CPU             OK         53 degrees C / 127 degrees F
      TFEB 0 LU 0 TSen               OK         37 degrees C / 98 degrees F
      TFEB 0 LU 0 Chip               OK         54 degrees C / 129 degrees F
      TFEB 0 MQ 0 TSen               OK         37 degrees C / 98 degrees F
      TFEB 0 MQ 0 Chip               OK         44 degrees C / 111 degrees F
      TFEB 0 TBB PFE TSen            OK         42 degrees C / 107 degrees F
      TFEB 0 TBB PFE Chip            OK         55 degrees C / 131 degrees F
      TFEB 0 TFEB PCIE TSen          OK         38 degrees C / 100 degrees F
      TFEB 0 TFEB PCIE Chip          OK         55 degrees C / 131 degrees F
Fans  Fan 1                          OK         Spinning at normal speed
      Fan 2                          OK         Spinning at normal speed
      Fan 3                          OK         Spinning at normal speed
      Fan 4                          OK         Spinning at normal speed
      Fan 5                          OK         Spinning at normal speed



I see no alarms but I'm concerned that shifting up and down will
stress the fans.

any thoughts? Is this typical?

Thanks,

-b

-- 
Bill Blackford
Network Engineer

Logged into reality and abusing my sudo privileges.....