title: Service Fabric Cluster VMSS OS upgrade from 2016 to 2019
body: <p><strong>My goal is to upgrade Service Fabric VMSS OS from 2016 to 2019.</strong></p>
  <p>Followed the Microsoft document on <a href="https://docs.microsoft.com/en-us/Azure/service-fabric/service-fabric-scale-up-node-type#process-to-upgrade-the-size-and-operating-system-of-the-primary-node-type-vms" rel="nofollow noreferrer">Scale up a Service Fabric cluster primary node type</a></p>
  <ul>
  <li>Deployed the initial cluster with two node types and two-scale sets (one scale set per node type) using these sample <a href="https://github.com/Azure/service-fabric-scripts-and-templates/blob/master/templates/nodetype-upgrade/Deploy-2NodeTypes-2ScaleSets.json" rel="nofollow noreferrer">templates</a> and <a href="https://github.com/Azure/service-fabric-scripts-and-templates/blob/master/templates/nodetype-upgrade/Deploy-2NodeTypes-2ScaleSets.parameters.json" rel="nofollow noreferrer">parameter</a> files. Both scale sets are size Standard D2_V2 and running Windows Server 2012 R2 Datacenter</li>
  <li>Deployed a new scale set to the primary node type using these samples <a href="https://github.com/Azure/service-fabric-scripts-and-templates/blob/master/templates/nodetype-upgrade/Deploy-2NodeTypes-3ScaleSets.json" rel="nofollow noreferrer">template</a> and <a href="https://github.com/Azure/service-fabric-scripts-and-templates/blob/master/templates/nodetype-upgrade/Deploy-2NodeTypes-3ScaleSets.parameters.json" rel="nofollow noreferrer">parameters</a> files.  The new scale set VMs are size Standard D4_V2 and run Windows Server 2016 Datacenter with Containers</li>
  </ul>
  <p><strong>Facing the following issue</strong></p>
  <ol>
  <li>As per the document, the new scale set to be part of the service fabric cluster,  but the new scale set didn't reflect in service fabric explore.</li>
  </ol>
  <p>Once the VMSS is part of the service fabric cluster, will be disabling the windows 2012 nodes scale set</p>
  <p>Any idea? (or) any other alternative to performing VMSS OS upgrade from windows 2016 to windows 2019</p>