How to clear VMware IPMI System Event Log

1. Open vCenter Server using vSphere Client.
2. In the vCenter inventory, select the ESX/ESXi host.
3. Click the Hardware Status tab.
4. Click System Event log under View and click the Reset Event log option. The red alert is removed from the System Event log.
5. Click the Reset Sensors option to reset the host sensors.

ที่มา http://kb.vmware.com/selfservice/search.do?cmd=displayKC&docType=kc&externalId=1033725