13.2. High Availability Considerations

A highly available host requires a power management device and its fencing parameters configured. In addition, for a virtual machine to be highly available when its host becomes non-operational, it needs to be started on another available host in the cluster. To enable the migration of highly available virtual machines:
  • Power management must be configured for the hosts running the highly available virtual machines.
  • The host on which the highly available virtual machines are running must be part of a cluster which has other available hosts.
  • The destination host must be running.
  • The source and destination host must have access to the data storage domain on which the virtual machine resides.
  • The source and destination host must have access to the same virtual networks and VLANs.
  • There must be enough virtual CPUs on the destination host that are not in use to support the virtual machine's requirements.
  • There must be enough virtual RAM on the destination host that is not in use to support the virtual machine's requirements.