Symptom:
Fan missing alarm raised/cleared

# Host(ASR9K)
RP/0/RSP0/CPU0:Feb 25 04:05:23.612 JST: invmgr[256]: %PLATFORM-INV-6-OIROUT : OIR: Node 101 Sn: CATXXXXXXXX removed  
RP/1/RSP0/CPU0:Feb 25 04:05:23.613 JST: invmgr[256]: %PLATFORM-INV-6-OIROUT : OIR: Node 101 Sn: CATXXXXXXXX removed  
RP/0/RSP0/CPU0:Feb 25 04:05:23.619 JST: envmon[211]: %PLATFORM-ENVMON-2-SAT_FAN_MISSING : Fan unit missing - raised on Satellite 101 
RP/1/RSP0/CPU0:Feb 25 04:05:23.618 JST: envmon[211]: %PLATFORM-ENVMON-2-SAT_FAN_MISSING : Fan unit missing - raised on Satellite 101 
RP/0/RSP0/CPU0:Feb 25 04:05:29.267 JST: invmgr[256]: %PLATFORM-INV-6-OIRIN : OIR: Node  Sn: CATXXXXXXXX inserted  
RP/1/RSP0/CPU0:Feb 25 04:05:29.266 JST: invmgr[256]: %PLATFORM-INV-6-OIRIN : OIR: Node  Sn: CATXXXXXXXX inserted  
RP/0/RSP0/CPU0:Feb 25 04:05:29.271 JST: envmon[211]: %PLATFORM-ENVMON-2-SAT_FAN_MISSING : Fan unit missing - cleared on Satellite 101 
RP/1/RSP0/CPU0:Feb 25 04:05:29.271 JST: envmon[211]: %PLATFORM-ENVMON-2-SAT_FAN_MISSING : Fan unit missing - cleared on Satellite 101

# Satellite (9000v2)
*Feb 24 12:00:41.166: %SAT9k_NOTIF-1-EQPT_ALM: DEF_SAT_FAN_MISSING has been raised
1. entry tlv->tlv_type = 192 
*Feb 24 12:00:46.814: %SAT9k_NOTIF-1-EQPT_ALM: DEF_SAT_FAN_MISSING has been cleared

Conditions:
in normal operation