Upgrade Azure Stack HCI, version 22H2 operating system to Azure Stack HCI, version 23H2 via Windows Admin Center

Applies to: Azure Stack HCI, versions 23H2 and 22H2

This article describes how to upgrade the Azure Stack HCI, version 22H2 operating system (OS) to version 23H2, which is the latest generally available software via Windows Admin Center.

While the recommended method to Upgrade the OS is via PowerShell, you can also upgrade via Windows Admin Center or other methods.

Throughout this article, we refer to Azure Stack HCI, version 23H2 as the new version and Azure Stack HCI, version 22H2 as the old version.

High-level workflow for the OS upgrade

The Azure Stack HCI operating system update is available via Windows Update and via the media that you can download from the Azure portal.

To upgrade the OS on your cluster, follow these high-level steps:

1. Complete the prerequisites.
2. Connect to the Azure Stack HCI, version 22H2 cluster.
3. Check for the available updates using Windows Admin Center.
4. Install the new OS, hardware and extension updates using Windows Admin Center.
5. Perform post-OS upgrade steps.

Complete prerequisites

Before you begin, make sure that:

• You have access to an Azure Stack HCI, version 22H2 cluster.
• The cluster should be registered in Azure.
• Make sure that all the nodes in your Azure Stack HCI, version 22H2 cluster are healthy and show as Online.
• You have access to the Azure Stack HCI, version 23H2 OS software update. This update is available via Windows Update or as a downloadable media. The media is an ISO file that you can download from the Azure portal.
• You have access to a client that can connect to your Azure Stack HCI cluster. This client should have Windows Admin Center installed on it. For more information, see Install Windows Admin Center.

Step 1: Connect to Azure Stack HCI cluster via Windows Admin Center

Follow these steps to add and connect to an Azure Stack HCI server via Windows Admin Center.

1. Select + Add under All Connections.
2. Scroll down to Server clusters and select Add.
3. Type the name of the cluster and, if prompted, the credentials to use.
4. Select Add to finish.
5. The cluster and nodes are added to your connection list on the Overview page. Select the cluster to connect to it.

Step 2: Install operating system and hardware updates using Windows Admin Center

Windows Admin Center makes it easy to update a cluster and apply quality updates using a simple user interface. If you purchased an integrated system from a Microsoft hardware partner, it's easy to get the latest drivers, firmware, and other updates directly from Windows Admin Center by installing the appropriate partner update extensions. ​If your hardware wasn't purchased as an integrated system, firmware and driver updates would need to be performed separately, following the hardware vendor's recommendations.

Follow these steps to install updates:

1. When you connect to a cluster, the Windows Admin Center dashboard alerts you if one or more servers have updates ready to be installed and provide a link to update now. Alternatively, select Updates from the Operations menu at the left.

2. If you're updating your cluster for the first time, Windows Admin Center checks if the cluster is properly configured to run CAU. If not, it prompts you to allow Windows Admin Center to configure CAU, which includes installing the CAU cluster role and enabling the required firewall rules. To begin the update process, select Add Cluster-Aware-Updating role.

   

   Note

   To use the CAU tool in Windows Admin Center, you must enable Credential Security Service Provider (CredSSP) and provide explicit credentials. If you are asked if CredSSP should be enabled, select Yes. Specify your username and password, and select Continue.

3. After the role is installed, Windows Admin Center automatically checks for updates applicable to your cluster. Ensure the radio button for Feature update (Recommended) is selected and the Feature update for Azure Stack HCI, version 23H2 is Available for the cluster nodes. If the feature update isn't displayed, ensure your cluster is running the Azure Stack HCI OS and that the nodes have direct access to Windows Update, then select Check for updates.

   

   Important

   Feature updates aren't available in Windows Server Update Services (WSUS).

   If you navigate away from the Updates screen while an update is in progress, there could be unexpected behavior, such as the history section of the Updates page not populating correctly until the current run is finished. We recommend opening Windows Admin Center in a new browser tab or window if you wish to continue using the application while the updates are in progress.

4. Select Install. Windows Admin Center automatically performs a series of readiness checks to identify issues that could prevent CAU from completing successfully. If any issues are found, select the Details link next to the issue, address the issue, and then select Check again to run the readiness checks again.

   

   Note

   If you're installing updates on a cluster that has Kernel Soft Reboot enabled, select Disable Kernel Soft Reboot for this run checkbox. This selection disables Kernel Soft Reboot as the upgrade requires a full reboot.

5. Select Next: Install to review the list of updates to be installed to each cluster node. Then, select Install to begin installing the operating system updates. One by one, each server downloads and applies the updates. The update status changes to Installing updates. If the updates require a restart, servers are restarted one at a time, moving cluster roles such as virtual machines between servers to prevent downtime. Depending on the updates being installed, the entire update run can take anywhere from a few minutes to several hours. You would need to sign in to Windows Admin Center multiple times.

   

   Note

   If the updates fail with a Couldn't install updates or Couldn't check for updates warning or if one or more servers indicate couldn't get status during the run, wait a few minutes, and refresh your browser. You can also use Get-CauRun to check the status of the update run with PowerShell.

6. When operating system updates are complete, the update status changes to Succeeded. Select Next: Hardware updates to proceed to the hardware updates screen.

   Important

   After applying operating system updates, you may see a message that "storage isn't complete or up-to-date, so we need to sync it with data from other servers in the cluster." This is normal after a server restarts. Don't remove any drives or restart any servers in the cluster until you see a confirmation that the sync is complete.

   Note

   Hardware updates are only available on clusters that have the vendor's hardware extension installed. If your Windows Admin Center does not have this extension, there will not be an option to install hardware updates.

7. Windows Admin Center checks the cluster for installed extensions that support your specific server hardware. Select Next: Install to install the hardware updates on each server in the cluster. If no extensions or updates are found, select Exit.

8. As per security best practices, disable CredSSP as soon as you're finished installing the updates:

   • In Windows Admin Center, under All connections, select the first server in your cluster and then select Connect.
   • On the Overview page, select Disable CredSSP, and then, on the Disable CredSSP pop-up window, select Yes.

You're now ready to perform the post-upgrade steps for your cluster.

Next steps

• Learn how to perform the post-upgrade steps for your Azure Stack HCI cluster.