Getting into the nitty-gritties of HA, a host failure may not be as straightforward as a going hard down/crash. There are situations when the host may fail partially, for instance, let's presume a set of network cards have failed. If the NICs were associated with the management network, the host gets isolated from the other hosts. At this juncture, the host has not truly failed and all of the virtual machines are in a pristine functioning state. vSphere HA could restart these VMs, causing an outage to the application/end user, or it could choose to have additional validations and trigger a more appropriate response.
In this recipe, we will discuss configuring host isolation response.
