The hardware component VMware Rollup Health State on ESX server
These days, server hardware issues are much less common than in the early days of IT when power supply, and other failures were common occurrences. Of course, the easy protection against power supply failures is to use redundant power supplies. The question is, how do you know if a power supply has failed and it has to be replaced? The server in question may be running on a single power supply, which means there is no longer redundancy until the failed power supply has been replaced.
These error messages demonstrate how having VMware ESX/ESXi hosts under Intelligent Monitoring can help you immediately identity a failed power supply (or any other redundant component on the ESX/ESXi host). This allows the IT support staff to immediately address the issue, order the replacement parts and service, and get back to a redundant state as soon as possible.
This scenario could turn ugly very quickly if the failure goes unnoticed and the second power supply fails as well. A full VMware host outage can be easily avoided by subscribing to Intelligent Monitoring and using its alerting features.
Figure 1. VMware ESX Health State changes from 3 (Red) to 1 (Green) after replacing a failed power supply
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