Symptom

+ Temperature alarms + Differences in speed observable via `show environment fan detail` 513E-A-18-N9K-C9336C-FX2-1# show environment fan detail Fan: --------------------------------------------------------------------------- Fan Model Hw Direction Status --------------------------------------------------------------------------- Fan1(sys_fan1) NXA-FAN-65CFM-PI -- front-to-back Ok Fan2(sys_fan2) NXA-FAN-65CFM-PI -- front-to-back Ok Fan3(sys_fan3) NXA-FAN-65CFM-PI -- front-to-back Ok Fan_in_PS1 -- -- front-to-back Ok Fan_in_PS2 -- -- front-to-back Shutdown Fan Zone Speed: Zone 1: 0x80 Fan Air Filter : NotSupported Fan: ------------------------------------------------------------------ Fan Name Fan Num Fan Direction Speed(%) Speed(RPM) ------------------------------------------------------------------ Fan1(sys_fan1) fan1 front-to-back 49 11587 Fan1(sys_fan1) fan2 front-to-back 50 10285 Fan1(sys_fan1) fan3 front-to-back 49 11612 Fan1(sys_fan1) fan4 front-to-back 50 10266 Fan2(sys_fan2) fan1 front-to-back 20 4745 <---Fan 2 reduced speed/RPM Fan2(sys_fan2) fan2 front-to-back 20 4163 Fan2(sys_fan2) fan3 front-to-back 20 4691 Fan2(sys_fan2) fan4 front-to-back 20 4179 Fan3(sys_fan3) fan1 front-to-back 20 4791 <---Fan3 reduced speed/RPM Fan3(sys_fan3) fan2 front-to-back 20 4248 Fan3(sys_fan3) fan3 front-to-back 20 4817 Fan3(sys_fan3) fan4 front-to-back 21 4292

Conditions

+ N9K-C9336-FX2 running 9.3(8) along with 9.3(8) EPLD in lxc boot mode + Observable with both fan types: NXA-FAN-65CFM-PI NXA-FAN-65CFM-PE

Workaround

+ `hardware fan-zone 1 raise-speed 1` to reset the speed, however it will revert back to the uneven speeds. 513E-A-18-N9K-C9336C-FX2-1(config)# hardware fan-zone 1 raise-speed 1 513E-A-18-N9K-C9336C-FX2-1(config)# show environment fan detail Fan: --------------------------------------------------------------------------- Fan Model Hw Direction Status --------------------------------------------------------------------------- Fan1(sys_fan1) NXA-FAN-65CFM-PI -- front-to-back Ok Fan2(sys_fan2) NXA-FAN-65CFM-PI -- front-to-back Ok Fan3(sys_fan3) NXA-FAN-65CFM-PI -- front-to-back Ok Fan_in_PS1 -- -- front-to-back Ok Fan_in_PS2 -- -- front-to-back Shutdown Fan Zone Speed: Zone 1: 0x81 Fan Air Filter : NotSupported Fan: ------------------------------------------------------------------ Fan Name Fan Num Fan Direction Speed(%) Speed(RPM) ------------------------------------------------------------------ Fan1(sys_fan1) fan1 front-to-back 49 11538 Fan1(sys_fan1) fan2 front-to-back 50 10266 Fan1(sys_fan1) fan3 front-to-back 49 11587 Fan1(sys_fan1) fan4 front-to-back 50 10227 Fan2(sys_fan2) fan1 front-to-back 50 11688 Fan2(sys_fan2) fan2 front-to-back 50 10285 Fan2(sys_fan2) fan3 front-to-back 49 11612 Fan2(sys_fan2) fan4 front-to-back 50 10285 Fan3(sys_fan3) fan1 front-to-back 50 11816 Fan3(sys_fan3) fan2 front-to-back 51 10444 Fan3(sys_fan3) fan3 front-to-back 50 11868 Fan3(sys_fan3) fan4 front-to-back 51 10485

Further Problem Description