Does the server have light-out mgmt? You can upgrade the BIOS via that. That takes care of the host. ESXi updates can be done through a vCenter.

Enterprise virtualization features such as snapshots and clones allow data center managers to test system upgrades prior to production implementation. For example, these tools take the guesswork out ...

At VMworld going on in San Francisco this week, Unitrends, a provider of enterprise-level cloud recovery, introduced Unitrends Free support for the free VMware vSphere Hypervisor (ESXi). Unitrends ...