On Juniper Networks QFX5110 VC. The "show chassis environment" output will show the PEM and FAN tray status of backup member as absent. Although, the units will work normal without any issue

> show chassis environment no-forwarding

Class Item Status Measurement

Power FPC 0 Power Supply 0 OK 52 degrees C / 125 degrees F

FPC 0 Power Supply 1 OK 53 degrees C / 127 degrees F

FPC 1 Power Supply 0 Absent

FPC 1 Power Supply 1 Absent

Fans FPC 0 Fan Tray 0 Fan 0 OK Spinning at normal speed

FPC 0 Fan Tray 0 Fan 1 OK Spinning at normal speed

--- snipped -----

FPC 1 Fan Tray 0 Fan 0 Absent

FPC 1 Fan Tray 0 Fan 1 Absent

FPC 1 Fan Tray 1 Fan 0 Absent

Issue has been tracked on PR1670917 (https://prsearch.juniper.net/problemreport/PR1670917)

Resolved-In

junos:18.4R3-S9 junos:19.3R3-S3 junos:20.4R2-S1 junos:20.4R3 junos:21.1R3 junos:21.2R2 junos:21.3R1 junos:21.4R1

WORKAROUND

Restart lcmd of the affected member

start shell user root

ps aux | grep lcmd

Then issue, kill -9 <PID>

08/08/2023 - KB Created