In a vSphere environment, what happens if a VM is running on a partially degraded host?

In a vSphere environment, if a VM is running on a partially degraded host, the correct outcome is that the VM will be automatically migrated to a healthy host. This process is commonly facilitated by vSphere's High Availability (HA) feature or Distributed Resource Scheduler (DRS).

HA monitors the health of the hosts in the cluster, and if a host fails or becomes degraded to a point where it can no longer efficiently support the VMs running on it, HA can initiate the process of safeguarding the workloads by restarting them on other operational hosts within the cluster.

Conversely, standard operation for resource management through DRS ensures that if the system detects an imbalance due to degraded performance, it can automatically redistribute the workloads across more capable hosts. This promotes not only uptime but also performance optimization for the VMs.

This proactive approach in vSphere infrastructure is key to maintaining high availability and performance, thereby minimizing potential downtime and service impact on the virtual machines.