https://kb.vmware.com/kb/1033725
Нужно почистить IPMI System Event.log
To run localcli command on the ESXi 5.1 or 5.5 host:
1. Connect to the ESXi host through SSH. For more information, see Using Tech Support Mode in ESXi 4.1 and ESXi 5.x (1017910).
2. Run this command:
localcli hardware ipmi sel clear