Netra T5220 - One or more power supplies show disabled sensors

Asset ID:	1-72-2004099.1
Update Date:	2017-05-01
Keywords:

Solution Type Problem Resolution Sure

Solution 2004099.1 : Netra T5220 - One or more power supplies show disabled sensors

Applies to:

Sun Netra T5220 Server - Version All Versions and later
Information in this document applies to any platform.

Symptoms

Server shows fault in a power supply (prtdiag -v):

Fan indicators:
----------------------------------------------------------------
Location                           Sensor             Condition
----------------------------------------------------------------
SYS/PS0                            FAN_FAULT          ok
SYS/PS1                            FAN_FAULT          disabled

Temperature indicators:
----------------------------------------------------------------
Location                           Indicator          Condition
----------------------------------------------------------------
SYS/PS0                            TEMP_FAULT         ok
SYS/PS1                            TEMP_FAULT         disabled

Current sensors:
----------------------------------------------------------------
Location                           Sensor             Status
----------------------------------------------------------------
SYS/PS0                            I_IN_MAIN          ok
SYS/PS0                            I_IN_LIMIT         ok
SYS/PS0                            I_OUT_MAIN         ok
SYS/PS0                            I_OUT_LIMIT        ok
SYS/PS1                            I_IN_MAIN          disabled
SYS/PS1                            I_IN_LIMIT         disabled
SYS/PS1                            I_OUT_MAIN         disabled
SYS/PS1                            I_OUT_LIMIT        disabled

Current indicators:
----------------------------------------------------------------
Location                           Indicator          Condition
----------------------------------------------------------------
SYS/MB                             I_USB0             ok
SYS/MB                             I_USB1             ok
SYS/PS0                            CUR_FAULT          ok
SYS/PS1                            CUR_FAULT          disabled

Voltage sensors:
----------------------------------------------------------------
Location                           Sensor             Status
----------------------------------------------------------------
SYS/MB                             V_VMEML            ok
SYS/MB                             V_VMEMR            ok
SYS/MB                             V_+3V3_STBY        ok
SYS/MB                             V_VCORE            ok
SYS/MB                             V_+3V3_MAIN        ok
SYS/MB                             V_VDDIO            ok
SYS/MB                             V_+12V0_MAIN       ok
SYS/MB                             V_VBAT             ok
SYS/PS0                            V_IN_MAIN          ok
SYS/PS0                            V_OUT_MAIN         ok
SYS/PS1                            V_IN_MAIN          disabled
SYS/PS1                            V_OUT_MAIN         ok 

However reseating the PSU, replacing the PSU and checking the cables/sockets doesn't fix the problem. Firmware version was pretty recent, discarding possible firmware issues.

The power supply itself shows as fine:

============================ FRU Status ============================
Location                           Name      Status  
------------------------------------------------------ 
SYS                                PS0       enabled  
SYS                                PS1       enabled  <--------

No service LEDs are on:

LEDs:
----------------------------------------------------------------
Location                           LED                State   
----------------------------------------------------------------
SYS                                SERVICE            off     <----------
SYS                                LOCATE             off     
SYS                                ACT                steady

Cause

The rail screws may be too long and pinning one of the power supply into the bay (the power supply affected by the screws may not be the one reporting the disabled sensors). This can cause that the power supply doesn't properly seat and causes one of the power supplies to have all its sensors flagged as disabled.

Solution

Changing the rail screws to smaller screws or loosening them up a bit will make sure the power supply is attached properly and return the sensors to working order.

Field engineer comments: Replaced ps1, but that did not fix it. I had the customer power down the OS and than I tried to swap the power supplies, but I was unable to. I unracked the server and loosened the rail screws and I was able to take ps0 out. The customer was using screws that were too long and they were pinning the power supply into the bay.

Attachments

This solution has no attachment