Symptom
Nexus 9000 does not display the serial no of the fan tray under show inventory.
Conditions
leaf14# sh inventory | be FAN
PID: N9K-C9300-FAN2 , VID: V01 , SN: N/A
NAME: "Fan 2", DESCR: "Nexus9000 C9396TX Chassis Fan Module"
PID: N9K-C9300-FAN2 , VID: V01 , SN: N/A
NAME: "Fan 3", DESCR: "Nexus9000 C9396TX Chassis Fan Module"
PID: N9K-C9300-FAN2 , VID: V01 , SN: N/A
Workaround
None. This is expected as the fans on N9300 have no means of reporting serial number.