Chassis fan BIG-IP report as bad ?


If you found problem on your BIG-IP 9.2.3 or below version system about chassis fan reporting failure you should not worried too much.
We can check with performing this command
# b platform
PLATFORM INFORMATION --
-------------------
+-> CPU 1 temp 50degC fan speed 10887rpm
|
| CHASSIS TEMPERATURE
| (1) 46degC (2) 42degC (101) -1degC (102) -1degC
|
| CHASSIS FAN
| (101) DOWN! (102) DOWN! (103) DOWN! (104) DOWN! (105) DOWN!
| (106) DOWN!
|
| POWER SUPPLY
| (101) active
--------------

We also can check at
# more /var/log/ltm | grep Chassis
--------------
system_check: 010d0005:3: Chassis fan 101: status (0) is bad.
--------------

Actually the fan wasn't down, it just a minor bug of BIG-IP, it's code: CR63196.
Solutions below :

SOL7071: The SCCP kernel driver timer wrap causes an I2C read failure.
This is the result of a known issue. A timer wrap within the SCCP kernel occurs after 497 days, and resets the timer to O (zero).
The timer wrap causes I2C (Inter-Integrated Circuit bus) driver read/write failures because the I2C is unable to correctly handle the kernel timer wrapping.
The SMBus then enters a lockup condition, which causes all subsequent I2C read/write communications to fail until the SCCP is rebooted.
As a result, the SCCP cannot gather data from the host system on chassis fan speeds and link status until the SCCP is rebooted.

SOL6929:
The BIG-IP chassis fan status is incorrectly reported as bad.
This behavior is due to a SMBus timing issue, in which the system_check script communicates with various monitored hardware components in order to obtain information.

We should performing full power down or hard-resetting or restart SCCP to solve this issue.

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