Cannot validate host customizations for host ‘fqdn’. null

I’ve been doing a lot of work recently with Auto Deploy and Host Profiles in vCenter.  I feel both of these technologies are very underrated in vCenter.  With Host Profile, prior to using Auto Deploy, I always felt they were just a little more trouble then it was worth.  Trying to get every host compliant at the same time seemed like this loosing battle I was facing.  But Auto Deploy and Host Profiles go hand in hand so it was an opportunity to get it right.

While deploying Host Profiles to our Cloud environment I ran into a few interesting errors.  One of these were the below.

Cannot validate host customizations for host x.x.x.x. null

host_profile_null

The error was generated in the vSphere Web Client while trying to validate the Host Profile and apply.  This error was very non-descriptive and provided little in the was of help.  As much as I tried not to I defaulted back to the C# Client and tried to apply the Host Profile once again to the host.  This time I received a much more informative error message.

Host Profile execution failed: ‘Balanced’ CPU policy not supported by system

Now this was now much clearer.  What had happened was that I generated the Host Profile on a physical host with slightly different hardware.  I was able to quickly fix the issue by deselecting Power System in the Host Profiles configuration.

The interesting take-away here was not what caused the error but having to revert to the C# Client to get some meaningful information on the error.  So it’s worth trying both the vSphere Web Client and C# Client when facing similar errors.

References

Applying the Host Profile settings on an ESXi host using vSphere Auto Deploy fails with the error: Host Profile execution failed: ‘Balanced’ CPU policy not supported by system

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