ESXi won't boot

[KasperV87]

Last week we've restarted one of our ESXi hosts, which is running version: 6.5.0.update01-5969303.

We've noticed that ESXi won't boot properly, it fails with error:

fatal error 8 (device error) esxi /tboot.b00

Running hardware diagnostics identifies no issues, all tests pass.

ESXi recovery didn't change a thing.

We've disconnected all Storage LUN's, created a fresh boot LUN and performed a clean install, restarted the system and ... we've got the same error.

We've tried to put all BIOS settings to default and boot, this didn't change a thing.

What should i look for next ...

[StephenMoll]

I would suspect that the boot device is defective, or if it is actually OK, it isn't ready for use when then the ESXi server tries to boot from it.

[MikeStoica]

Did you looked through the ESXi logs?