How to fix? The CPU in this host is not supported by ESXi 7.0.0. -> allowLegacyCPU=True

Thank You William for these Quick Tip.

On my HomeLAB I have older server with NOT supported CPU for ESXi 7.0. During install I had an error:

The CPU in this host is not supported by ESXi 7.0.0.

CPU_SUPPORT ERROR:
The CPU in this host is not supported by ESXi
7.0.0. Please refer to the VMware Compatibility Guide (VCG) for
the list of supported CPUs.
Only possibilty is F11 Reboot.

FIX – The CPU in this host may not be supported in future ESXi releases …

It could be fix during boot SHIFT-O:

allowLegacyCPU=True
SHIFT-O will open options for boot:
With adding > allowLegacyCPU=True. Installer will convert an error to a warning.
Now we have only Warning – Enter will continue.
CPU_SUPPORT WARNING:
The CPU in this host is not supported by ESXi
7.0.0. Please refer to the VMware Compatibility Guide (VCG) for
the list of supported CPUs.

\UPGRADE\PRECHECK.PY

On ISO image VMware-VMvisor-Installer-7.0.0-15843807.x86_64.iso is \UPGRADE\PRECHECK.PY script which is checking it during instalation.

On line 1720 we could see our solution allowLegacyCPU = True

Disclaimer: This is not officially supported by VMware and you run on your own risk.

Author: Daniel Micanek

Senior Service Architect, SAP Platform Services Team at TietoEVRY vExpert 2020 | VCIX6.5-DCV | VCP6.5-DCV | VCP-NV 2019 | NCIE-DP and OCP.