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| 1 | +--- |
| 2 | +title: About Azure Stack HCI Upgrade to latest version 23H2 |
| 3 | +description: Learn about how to upgrade from Azure Stack HCI, version 22H2 to latest Azure Stack HCI, version 23H2. |
| 4 | +author: alkohli |
| 5 | +ms.topic: conceptual |
| 6 | +ms.date: 08/13/2024 |
| 7 | +ms.author: alkohli |
| 8 | +ms.reviewer: alkohli |
| 9 | +ms.subservice: azure-stack-hci |
| 10 | +--- |
| 11 | + |
| 12 | +# About Azure Stack HCI upgrades |
| 13 | + |
| 14 | +[!INCLUDE [applies-to](../../includes/hci-applies-to-23h2-22h2.md)] |
| 15 | + |
| 16 | +This article provides an overview of upgrading your existing Azure Stack HCI system from version 22H2 to version 23H2. |
| 17 | + |
| 18 | +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. |
| 19 | + |
| 20 | +## About Azure Stack HCI, version 23H2 |
| 21 | + |
| 22 | +Azure Stack HCI, version 23H2 is the latest version of the Azure Stack HCI solution. This version integrates the Azure Arc infrastructure that provisions and manages the workloads such as Arc VMs, Azure Kubernetes Services, and Azure Virtual Desktop. For more information, see [What's new in Azure Stack HCI, version 23H2](../whats-new.md#features-and-improvements-in-2311). |
| 23 | + |
| 24 | +With version 23H2, Azure Stack HCI evolved from a cloud connected operating system (OS) to an Arc enabled solution. The OS forms the base layer of this solution, with the Arc and the Orchestrator (also known as the Lifecycle Manager) components layered on top. These components are packaged together into a solution that follows an [Infrastructure as code (IaC)](/devops/deliver/what-is-infrastructure-as-code) model. |
| 25 | + |
| 26 | +- This IaC model takes a set of input parameters that are specific to each customer and the environment. |
| 27 | +- The lifecycle manager then orchestrates the desired state across all the layers to meet the desired state and the version. |
| 28 | + |
| 29 | +The following diagram illustrates the components of an Azure Stack HCI, version 23H2 system: |
| 30 | + |
| 31 | +:::image type="content" source="./media/about-upgrades-23h2/azure-stack-hci-23h2-and-its-components.png" alt-text="Diagram that illustrates Azure Stack HCI and its components." lightbox="./media/about-upgrades-23h2/azure-stack-hci-23h2-and-its-components.png"::: |
| 32 | + |
| 33 | +## Azure Stack HCI upgrade versus update |
| 34 | + |
| 35 | +An upgrade is a whole new version of software that represents a significant change or major improvement. An update, on the other hand, is a process of applying a set of changes to the software to improve its performance, security, or stability. |
| 36 | + |
| 37 | +The Azure Stack HCI, version 23H2, is a whole new version of the solution with a multitude of new capabilities. To move from Azure Stack HCI, version 22H2 to version 23H2, you need to upgrade your existing cluster. On the other hand, to ensure that you have the most recent features and security improvements for your current version of Azure Stack HCI, you would need to update your existing cluster. |
| 38 | + |
| 39 | +## High-level steps for Azure Stack HCI upgrade |
| 40 | + |
| 41 | +To upgrade your Azure Stack HCI from an old version, follow these high-level steps: |
| 42 | + |
| 43 | +1. Upgrade the *old* OS to the *new* OS using one of the following methods: |
| 44 | + - [Via the PowerShell (recommended)](./upgrade-22h2-to-23h2-powershell.md). |
| 45 | + - [Via the Windows Admin Center](./upgrade-22h2-to-23h2-windows-admin-center.md). |
| 46 | + - [Via other manual methods](./upgrade-22h2-to-23h2-other-methods.md). |
| 47 | + |
| 48 | +1. Perform post-OS upgrade tasks. |
| 49 | + |
| 50 | +1. Validate the solution upgrade readiness. |
| 51 | + |
| 52 | +1. Apply the solution upgrade. |
| 53 | + |
| 54 | +The following diagram illustrates the Azure Stack HCI upgrade process: |
| 55 | + |
| 56 | +:::image type="content" source="./media/about-upgrades-23h2/update-os-to-23h2-and-apply-the-solution-update.png" alt-text="Diagram that illustrates the two steps to update the Azure Stack HCI OS and then apply the solution update." lightbox="./media/about-upgrades-23h2/update-os-to-23h2-and-apply-the-solution-update.png"::: |
| 57 | + |
| 58 | +## Next steps |
| 59 | + |
| 60 | +Choose one of the following options to upgrade your Azure Stack HCI, version 22H2 to Azure Stack HCI, version 23H2: |
| 61 | +- [Use PowerShell](./upgrade-22h2-to-23h2-powershell.md). |
| 62 | +- [Use Windows Admin Center](./upgrade-22h2-to-23h2-windows-admin-center.md). |
| 63 | +- [Use other methods](./upgrade-22h2-to-23h2-other-methods.md). |
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