Just noticed a issue that nothing reported in ' Hardware Status ' tab of ESXi hosts in vSphere Web Client. KB 2112847 gives a solution but not works for me. The feature can be used to monitor hardware failures. I figured out a way to workaround it. You just need to login by Administrator account and click ' Update ' button under ' Monitor ' - ' Hardware Status ' for each ESXi host. You will get the status after few minutes.