To clear warnings and errors:
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Click the Hardware Status tab under Manage.
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Click the System event log view.
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Click Reset event log.
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Click Update to clear the error.
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Click the Alerts and warnings view.
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Click Reset sensors.
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Click Update to clear the memory.
* Reset Health Status Sensors
https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.monitoring.doc/GUID-757B7ACC-8766-44D0-8AD9-7A8A15258A57.html
If the issue persists, restart the management agents:
- Connect to the ESX/ESXi host using SSH.
- Run this command to restart the sfcbd service:
In ESX: /etc/init.d/sfcbd-watchdog restart
In ESXi: services.sh restart
- localcli hardware ipmi sel clear (This command above helps in clearing memory alert not just IPMI alert)
- Click Update.
If the issue persists the perform the below steps :
- Highlight vCenter object in the vSphere client (left top corner).
- Select Alarms tab on the right hand side.
- Click on Definitions tab underneath the main tabs
- Highlight the alarm which you want to clear.
- Right click on the highlighted alarm and select edit settings.
- Disable the alarm (uncheck the Enable this alarm check box) and click ok.
- Right click on the highlighted alarm and select edit settings.
- Enable the alarm (Select the Enable this alarm check box) and click ok.