Having access to the ESXi host logs is required in order to troubleshoot or determine the root cause of an ESXi host failure. Redirecting host logs to persistent storage or to a Syslog server is especially important when a host has not been installed to persistent storage, for example, a stateless host deployed using vSphere Auto Deploy or a host that has been installed to a USB stick.
Logging may not seem to be a key component in disaster recovery. Having a proper backup of the host configuration allows a host to be quickly returned to a service, but if the root cause of the failure cannot be determined, preventing the failure from happening again cannot be guaranteed. Logs are the best source for performing analyses to determine the root cause of a failure and to determine the best course of action required to prevent future failures.
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