What could cause an ESXi Host to reboot

[vpam]

Are there any possible causes which will reboot an ESXi Host automatically, besides a loss of power?

The reason I'm asking is that it happened on one of our Host and I would like to find the cause or reason why it rebooted.

Cheers!

[Virtualinfra]

check kernel,vmksummary logs to see what is reported before the server got reboot.

Below are some common cause.

Hardware Issue.

Hostd agent getting busy due interruption to storage.

[virtualdive]

Hi VPam,

There are lot of reasons a hot could reboot other than power failure, below are some of them,

1. A hardware failure like, Power Supply, FANs etc...you want to check the iLO logs for any error recorded.

2. HDD errors.

3. NIC card failures, it should throw a PSOD though.

4. Host overcommitting too much CPU or Memory resources.

But whatever reason they are, the logs should be recorded.

Thanks,

[vpam]

Already checked iLO logs and HW and there everything is ok.

If a Host is overcommitting what would the log entries look like?

[timlane]

Double check all firmware for your hardware as well.

[tomjacobchirayi]

You might want to check the latency to each of the datastore that are available for the ESXi host. Particularly, the datastores which contains running virtual machines.

[GTO455]

I had this happen to me years ago on an IBM host that had a bad DIMM. It was erratic, often staying up for weeks between reboots.