VxRail: Hardware status is displayed as "unknown" for certain sensors on ESXi host[1]

           

   Article Number:     529469                                   Article Version: 3     Article Type:    Break Fix 
   

 


Product:

 

VxRail Appliance Family,VxRail Appliance Series,VxRail E Series Nodes,VxRail 460 and 470 Nodes,VxRail G Series Nodes,VxRail Gen 5,VxRail Gen2 Hardware,VxRail P Series Nodes,VxRail S Series Nodes,VxRail Software,VxRail V Series Nodes

 

Issue:

 

 

Certain sensors in ESXi host displays status as "unknown".                                                           

 

 

Cause:

 

 

Sensor in below categories do not report their health status.   

         
  •         Presence sensors,     
  •      
  •         Disabled sensors,     
  •      
  •         Sensors with no reading available,     
  •      
  •         BIOS related,     
  •      
  •         Event-only sensors     
  •      
  •         Watchdog Sensors     
  •    
    A change was made in vSphere 6.7 and 6.5 U2 releases to display status as "unknown".                                                           

 

 

Resolution:

 

 

This is an expected behaviour in ESXi 6.5 U2 and ESXi 6.7.   
   
    Please See VMware KB: https://kb.vmware.com/s/article/57171
                                                           

 

 

Notes:

 

 

How to identify a sensor belongs to one of the above mentioned category   
   
    BIOS related sensor :Run 'esxcli hardware ipmi sdr list' command on the host. BIOS related sensor will have Entity-Instance column value "34.1"   
   
    Presence sensor : Run 'esxcli hardware ipmi sdr list' command and check below information for all sensors   

         
  •         Base Unit should be either 'enabled-discrete' or 'available-discrete'     
  •      
  •         Or Sensor Type should be 'Entity Presence'     
  •    
    Note : This data available only in 6.7 not in 6.5 U2   
   
    Disabled or No reading : Run /bin/cim-diagnostic.sh script.   
    In OMC_RawIpmiSensor class instances, check below fields for each entry:   
    ReadingStateUnavailable = true -> No reading sensors   
    Scanning disabled = true -> Disabled sensors   
   
    Event-only sensor : Use ipmitool and run below command:   
    'ipmitool sdr elist all'   
     Check last column for 'Event-Only'entry.   
   
    Watchdog Sensor:   
    Running esxcli hardware ipmi sdr list command shows output  watchdog sensors category as "Watchdog"   
    eg:   
    Sensor              Health    SEL entries  Current reading   ID           Last updated  Category  Type/Unit   
    Other---0.35.0.212   Unknown   0               0              0.35.0.212      Unknown    Watchdog  Unknown