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FAQ: Expand on in-place updates #565

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FAQ: Expand on in-place updates #565

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Expand Up @@ -142,7 +142,7 @@ Yes, though consider carefully before doing so. Inspect the Match Labels from t
# Machine Deployments

## Upstream kubernetes cluster-api project is utilizing MachineDeployments, why isn’t OpenShift?
Any change to a MachineDeployment will result in an immediate removal and replacement of an entire MachineSet. This is a much more costly operation that making changes to an instance in-place. In particular RHEL CoreOS allows the VM to boot into an entirely updated operating system without having to perform a reinstallation.
Any change to a MachineDeployment will result in an immediate removal and replacement of an entire MachineSet. This is a much more costly operation that making changes to an instance in-place; for example, all cached container images need to be re-pulled. For OpenShift 4, the [machine config operator](https://github.com/openshift/machine-config-operator/) performs upgrades in place, while still preserving the "image like" aspect of replacing the whole OS as one transactional unit. More information in [OSUpgrades.md](https://github.com/openshift/machine-config-operator/blob/master/docs/OSUpgrades.md).

# Cluster Autoscaler

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