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Copy file name to clipboardExpand all lines: support/azure/virtual-machines/windows/how-to-use-perfInsights.md
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@@ -11,7 +11,7 @@ ms.collection: windows
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ms.workload: infrastructure-services
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ms.tgt_pltfrm: vm-windows
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ms.topic: troubleshooting
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ms.date: 05/14/2024
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ms.date: 05/02/2025
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ms.author: genli
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ms.custom: sap:VM Performance
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---
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The [Performance Diagnostics (PerfInsights) extension](https://aka.ms/perfinsightsdownload) is a self-help diagnostics tool that collects and analyzes diagnostic data, and provides a report to help troubleshoot Windows virtual machine (VM) performance problems in Azure. Use Performance Diagnostics to identify and troubleshoot performance issues in one of two modes:
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-**Continuous diagnostics (preview)** collects data at five-second intervals and reports actionable insights about high resource usage every five minutes.
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-**Continuous diagnostics** collects data at five-second intervals and reports actionable insights about high resource usage every five minutes.
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-**On-demand diagnostics** helps you troubleshoot an ongoing performance issue with more in-depth data, insights, and recommendations based on data collected at a single point in time.
Copy file name to clipboardExpand all lines: support/azure/virtual-machines/windows/performance-diagnostics.md
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ms.service: azure-virtual-machines
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ms.workload: infrastructure-services
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ms.topic: troubleshooting
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ms.date: 01/09/2025
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ms.date: 05/02/2025
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ms.custom: sap:VM Performance
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ms.reviewer: guywild, poharjan
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ms.author: anandh
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You can use the Performance Diagnostics tool to identify and troubleshoot performance issues on your Azure virtual machine (VM) in one of two modes:
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***Continuous diagnostics (preview)** collects data at five-second intervals and reports actionable insights about high resource usage every five minutes. Continuous diagnostics (preview) is currently supported only on Windows.
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***Continuous diagnostics** collects data at five-second intervals and reports actionable insights about high resource usage every five minutes. Continuous diagnostics is currently supported only on Windows.
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***On-demand diagnostics** helps you troubleshoot an ongoing performance issue by providing more in-depth data, insights, and recommendations that are based on data that's collected at a single moment. On-demand diagnostics is supported on both Windows and Linux.
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Performance Diagnostics stores all insights and reports in a storage account that you can configure for short data retention to minimize costs.
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This article explains how to use Performance Diagnostics and what the continuous and on-demand modes offer.
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> [!NOTE]
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> Continuous diagnostics (preview) is currently supported only on Windows. On Windows VMs, you'll see the option to enable both on-demand and continuous diagnostics. On Linux VMs, you'll see the option to enable on-demand diagnostics. For more information, see [Install and run Performance Diagnostics on your VM](#install-and-run-performance-diagnostics-on-your-vm).
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> Continuous diagnostics is currently supported only on Windows. On Windows VMs, you'll see the option to enable both on-demand and continuous diagnostics. On Linux VMs, you'll see the option to enable on-demand diagnostics. For more information, see [Install and run Performance Diagnostics on your VM](#install-and-run-performance-diagnostics-on-your-vm).
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## Prerequisites
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| Run Performance Diagnostics | The **Owner** role on the VM and an Azure role that includes the `Microsoft.Storage/storageAccounts/listkeys/action` permission on the storage account. |
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| View Performance Diagnostics | An Azure role that includes the `Microsoft.Storage/storageAccounts/listkeys/action` permission on the storage account or the **Storage Table Data Reader** role on the storage account. |
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| Download Performance Diagnostics reports | An Azure role that includes the `Microsoft.Storage/storageAccounts/listkeys/action` on the storage account or the **Storage Blob Data Reader** role on the storage account.|
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| Download Performance Diagnostics reports | An Azure role that includes the **Storage Table Data Reader** and the **Storage Blob Data Reader** role on the storage account. |
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For detailed information about built-in roles for Azure Storage, refer to [Azure built-in roles for Storage](/azure/role-based-access-control/built-in-roles/storage).
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