-| **MaxSurge** | MaxSurge is currently in preview for Virtual Machine Scale Sets with Flexible Orchestration and Uniform Orchestration. To use this preview feature, register the provider feature using `Register-AzProviderFeature -FeatureName MaxSurgeRollingUpgrade -ProviderNamespace Microsoft.Compute`.<br><br> With MaxSurge enabled, new instances are created in batches using the latest scale model. Once the batch of new instances are successfully created and marked as healthy, they begin taking traffic. The scale set then deletes instances in batches matching the old scale set model. This continues until all instances are brought up-to-date. rolling upgrades with MaxSurge can help improve service uptime during upgrade events. <br><br>With MaxSurge disabled, the existing instances in a scale set are brought down in batches to be upgraded. Once the upgraded batch is complete, the instances begin taking traffic again, and the next batch begins. This continues until all instances brought up-to-date. |
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