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* Additionally, there are three options to maintain high availability (HA) of virtual machines:
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** Use xref:../../installing/installing_bare_metal_ipi/ipi-install-overview.adoc#ipi-install-overview[installer-provisioned infrastructure] and xref:../../machine_management/deploying-machine-health-checks.adoc#machine-health-checks-about_deploying-machine-health-checks[deploy machine health checks].
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[NOTE]
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====
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In {VirtProductName} clusters installed using installer-provisioned infrastructure and with MachineHealthCheck properly configured, if a node fails the MachineHealthCheck and becomes unavailable to the cluster, it is recycled. What happens next with VMs that ran on the failed node depends on a series of conditions. See xref:../../virt/virtual_machines/virt-create-vms.adoc#virt-about-runstrategies-vms_virt-create-vms[About RunStrategies for virtual machines] for more detailed information about the potential outcomes and how RunStrategies affect those outcomes.
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** If you are not using installer-provisioned infrastructure, use either a monitoring system or a qualified human to monitor node availability. When a node is lost, shut it down and run `oc delete node <lost_node>`.
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[NOTE]
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====
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Without an external monitoring system or a qualified human monitoring node health, virtual machines lose high availability.
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** Use the xref:../../nodes/nodes/eco-node-health-check-operator.adoc#node-health-check-operator[Node Health Check Operator] on any {product-title} cluster to deploy the `NodeHealthCheck` controller. The controller identifies unhealthy nodes and uses the Poison Pill Operator to remediate the unhealthy nodes.
== How to maintain high availability of virtual machines
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There are three options to maintain high availability (HA) of virtual machines:
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* Automatic high availability for xref:../../installing/installing_bare_metal_ipi/ipi-install-overview.adoc#ipi-install-overview[installer-provisioned infrastructure] (IPI) is available by deploying xref:../../machine_management/deploying-machine-health-checks.adoc#machine-health-checks-about_deploying-machine-health-checks[machine health checks].
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[NOTE]
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====
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In {VirtProductName} clusters installed using installer-provisioned infrastructure and with MachineHealthCheck properly configured, if a node fails the MachineHealthCheck and becomes unavailable to the cluster, it is recycled. What happens next with VMs that ran on the failed node depends on a series of conditions. See xref:../../virt/virtual_machines/virt-create-vms.adoc#virt-about-runstrategies-vms_virt-create-vms[About RunStrategies for virtual machines] for more detailed information about the potential outcomes and how RunStrategies affect those outcomes.
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====
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* Automatic high availability for both IPI and non-IPI is available by using the xref:../../nodes/nodes/eco-node-health-check-operator.adoc#node-health-check-operator[Node Health Check Operator] on any {product-title} cluster to deploy the `NodeHealthCheck` controller. The controller identifies unhealthy nodes and uses the Self Node Remediation Operator to remediate the unhealthy nodes.
* High availability for any platform is available by using either a monitoring system or a qualified human to monitor node availability. When a node is lost, shut it down and run `oc delete node <lost_node>`.
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[NOTE]
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====
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Without an external monitoring system or a qualified human monitoring node health, virtual machines lose high availability.
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