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Sensor Access Degraded or Unavailable

Publication Date:  2015-06-24 Views:  127 Downloads:  0
Issue Description
Hardware configuration:
BH620

Symptom:

After the BH620 is installed in the chassis, it cannot start. The ALM indicator of the BH620 is blinking red, and no signal is output.
Handling Process
1.  Log in to the baseboard management controller (BMC) web user interface (WebUI). "No Signal" is displayed on the keyboard, video, and mouse (KVM).

2.  Alarms indicating "Sensor access degraded or unavailable,#13/17" are displayed on the BMC WebUI, as shown in Figure 1.

Figure 1 Alarms on the BMC WebUI



3.  For the BH620, sensors #13 and #17 indicate the temperature sensors of CPU 1 and CPU 2 respectively.

4.  On the BMC WebUI, choose System Information > Temperature Monitoring. The sensor scanning status of CPU 1 and CPU 2 is Disabled, as shown in Figure 2.

Figure 2 Sensors

Root Cause
The power supply is unstable, or the mainboard is malfunctioning. As a result, the BH620 cannot start after being powered on.


Solution
1.  Ensure that CPUs and DIMMs are properly installed.

2.  Ensure that the power supply of the equipment room is stable.

3.  Disconnect power supply from the BH620, and restore the power supply after all indicators on the mainboard are off. If the BH620 still cannot start, replace the mainboard.
Suggestions
For the RH2285, if sensors of CPUs cannot be read, the BMC reports alarms indicating "Sensor access degraded or unavailable, #1/2".

For the XH620, if sensors of CPUs cannot be read, the BMC reports alarms indicating "Sensor access degraded or unavailable, #5/6".

END