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Settings that Influence VM Node Selection#

Each time a VM is powered on or migrated, the system decides where to run the VM based on user-specified VM options as well as balancing workloads across available nodes.

VM options used in deciding node selection for running a VM:

  • HA Group

    • Node Affinity: (value starts with a "+", e.g. "+commapp") The system attempts to run VMs with the same HA Group value on the same node. This is used to coalesce application-related workloads to a single physical node for performance optimization.
    • Node Anti-affinity: (value does NOT with "+", e.g. "webservers") VMs with the same HA Group value are run on separate nodes to provide high availability of applications or services.

  • Preferred Node: a specific node is selected as the first-choice

  • Preferred Cluster: nodes in specified cluster used as first choice
  • Failover Cluster: nodes in specified cluster used as next choice when preferred cluster is not available

For more information about these and other VM options, see: Product Guide - Virtual Machine Fields