Received a Critical Alarm on the ESXi - "Host hardware voltage"

Products

• VMware vSphere ESXi

Issue/Introduction

In the vSphere UI, for an ESXi host, in the Summary tab - under Issues and Alarms, an alarm is seen - 

"Host hardware voltage"

Having ssh'd to the ESXi host, it is observed that a sensor event is being captured by running the commands below-

localcli hardware ipmi sel list*

localcli hardware ipmi sdr list*

Output similar to the below is returned by the commands above:

Events from System Event Logs

------- ------------------- -------------------------- ---------------------------------------------
Record When                Sensor                     Message

------- ------------------- -------------------------- ---------------------------------------------
XX YYYY-MM-DDThh:mm:ss X - Battery 1 CMOS Battery Assert + Voltage Lower Non-critical going low

 

Environment

VMware ESX 8.x

Cause

The ESXi hosts CMOS battery voltage is low.

Resolution

Engage with your hardware vendor (if necessary) to have the CMOS battery replaced in the ESXi host.