ESXi boot fatal error 33 inconsistent data

Another quick write-up. Recently, while installing patches and rebooting ESXi hosts, I encountered the following error message during the boot process of an ESXi host: “esxi boot fatal error 33 inconsistent data”, accompanied by the filename causing the inconsistency.

A quick search on the Internet returned various useful tips, ranging from re-installation of ESXi, re-running the installer or replacing the damaged file. However, not all workarounds are applicable in all situations.

Perhaps it is too obvious, but this solution is also to be considered, especially while updating hosts;
Revert the ESXi host to it’s previous version. Now the ESXi host can boot and the installation of the patches can be continued.

This VMware KB outlines how to revert an ESXi host to it’s previous state.

If during the update process of ESXi this error shows up: “The host returns esxupdate error code:15. The package manager transaction is not successful. Check the Update Manager log files and esxupdate log files for more details
Also the esxupdate.log shows “esxupdate: esxupdate: ERROR: InstallationError: (”, ‘There was an error checking file system on altbootbank, please see log for detail.’)”, it is time to have a look at this KB.

I hope this will help. Thank you for reading.

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