Service Fabric managed cluster node type scaling

Each node type in a Service Fabric managed cluster is backed by a virtual machine scale set. To allow managed cluster node types to create large virtual machine scale sets a property multiplePlacementGroups has been added to node type definition. By default, managed cluster node types set this property to false to keep fault and upgrade domains consistent within a placement group, but this setting limits a node type from scaling beyond 100 VMs. To help decide whether your application can make effective use of large scale sets, see this list of requirements.

Since the Azure Service Fabric managed cluster resource provider orchestrates scaling and uses managed disks for data, we are able to support large scale sets for both stateful and stateless secondary node types.

Note

This property can not be modified after a node type is deployed.

Enable large virtual machine scale sets in a Service Fabric managed cluster

To configure a secondary node type as a large scale set, set the multiplePlacementGroups property to true.

Note

This property can’t be set on the primary node type.

• The Service Fabric managed cluster resource apiVersion should be 2021-05-01 or later.

{
  "apiVersion": "[variables('sfApiVersion')]",
  "type": "Microsoft.ServiceFabric/managedclusters/nodetypes",
  "name": "[concat(parameters('clusterName'), '/', parameters('nodeTypeName'))]",
  "location": "[resourcegroup().location]",
  "dependsOn": [
    "[concat('Microsoft.ServiceFabric/managedclusters/', parameters('clusterName'))]"
  ],
  "properties": {
    "multiplePlacementGroups": true,
    "isPrimary": false,
    "vmImagePublisher": "[parameters('vmImagePublisher')]",
    "vmImageOffer": "[parameters('vmImageOffer')]",
    "vmImageSku": "[parameters('vmImageSku')]",
    "vmImageVersion": "[parameters('vmImageVersion')]",
    "vmSize": "[parameters('nodeTypeSize')]",
    "vmInstanceCount": "[parameters('nodeTypeVmInstanceCount')]",
    "dataDiskSizeGB": "[parameters('nodeTypeDataDiskSizeGB')]"
  }
}

Next steps

Deploy an app to a Service Fabric managed cluster