About power-based remediation of bare metal
You can configure and deploy a machine health check to detect and repair unhealthy bare-metal nodes, which is critical to ensuring the overall health of the cluster.
Physically remediating a cluster can be challenging and any delay in putting the machine into a safe or an operational state increases the time the cluster remains in a degraded state, and the risk that subsequent failures might bring the cluster offline. Power-based remediation helps counter such challenges.
Instead of reprovisioning the nodes, power-based remediation uses a power controller to power off an inoperable node. This type of remediation is also called power fencing.
Red Hat OpenShift Container Platform uses the MachineHealthCheck controller to detect faulty bare metal nodes. Power-based remediation is fast and reboots faulty nodes instead of removing them from the cluster.
Power-based remediation provides the following capabilities:
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Allows the recovery of control plane nodes
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Reduces the risk of data loss in hyperconverged environments
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Reduces the downtime associated with recovering physical machines