> For the complete documentation index, see [llms.txt](https://docs.vergeos-demo.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vergeos-demo.com/knowledge-base/automation-api/determine-node-where-vm-runs.md).

# 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 start 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

{% hint style="info" %}
**For more information about these and other VM options, see:** [**Product Guide - Virtual Machine Fields**](/run-the-platform/virtual-machines/vm-field-descriptions.md)
{% endhint %}


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