Enabling or disabling MaxSurge can be done at any point in time. This includes during or after scale set provisioning. When using a rolling upgrade policy, the scale set must also use the [Application Health Extension](virtual-machine-scale-sets-health-extension.md) have a [health probe](../load-balancer/load-balancer-custom-probe-overview.md). It's suggested to create the scale set with a manual upgrade policy and update the policy to rolling after successfully confirming the application health is being properly reported.
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