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Fan in back plane Cisco 6504

Unanswered Question
Mar 19th, 2014
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I have this Cisco 6504 and it generated the following syslog
Mar 13 03:17:45 192.168.90.230 1934: Mar 13 03:17:43.735: %C6KENV-SW1_SP-4-FANCOUNTFAILED: Required number of fan trays is not present
When I do show environment, it indicates that the fan in the fan tray is ok but the "operating fan count 0" in the switch 1 backplane. I don't see any fan in the backplane but I'm
not sure either what fan is it talking about. I have a opened a TAC but of course TAC has not clue either.
Can someone shed some light on this please?

show environment
environmental alarms:
system minor alarm on operating fan count (raised 6d10h ago)

switch 1 backplane:
  operating clock count: 2
  operating fan count: 0
 
switch 2 backplane:
  operating clock count: 2
  operating fan count: 1
 
switch 1 fan-tray 1:
  switch 1 fan-tray 1 type: FAN-MOD-4HS
  switch 1 fan-tray 1 mode: Restricted-power
  switch 1 fan-tray 1 fan-fail: OK
switch 2 fan-tray 1:
  switch 2 fan-tray 1 type: FAN-MOD-4HS
  switch 2 fan-tray 1 mode: Restricted-power
  switch 2 fan-tray 1 fan-fail: OK

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