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Copy file name to clipboardExpand all lines: support/azure/virtual-machines/windows/performance-diagnostics.md
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|**Enable continuous diagnostics**| Get continuous, actionable insights into high resource usage by having data collected every 5 seconds and updates uploaded every 5 minutes to address performance issues promptly. Store insights in your preferred storage account. The storage account retains insights based on the account retention policies that you can configure to [manage the data lifecycle effectively](/azure/storage/blobs/lifecycle-management-policy-configure). You can disable continuous diagnostics at any time. |
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| **Run on-demand diagnostics** | Get on-demand, actionable insights into high resource usage and various system configurations. Receive a downloadable report that provides comprehensive diagnostics data to address performance issues. Store insights and reports in your preferred storage account. The storage account retains insights that are based on the account retention policies that you can configure to [manage the data lifecycle effectively](/azure/storage/blobs/lifecycle-management-policy-configure). You can initiate on-demand diagnostics at any time by using the specific analysis type that you need:<br/><ul><li>**Performance analysis**<br/>Includes all checks in the **Quick analysis** scenario, and monitors high resource consumption. Use this version to troubleshoot general performance issues, such as high CPU, memory, and disk usage. This analysis takes 30 seconds to 15 minutes to run, depending on the selected duration. Learn more [Windows](how-to-use-perfinsights.md) or [Linux](../linux/how-to-use-perfinsights-linux.md)</li><br/><li>**Quick analysis**<br/>Checks for known issues, analyzes best practices, and collects diagnostics data. This analysis takes several minutes to run. Learn more for [Windows](how-to-use-perfinsights.md) or [Linux](../linux/how-to-use-perfinsights-linux.md)</li><br/><li>**Advanced performance analysis** [*Windows only*]<br/>Includes all checks in the **Performance analysis** scenario, and collects one or more of the traces, as listed in the following sections. Use this scenario to troubleshoot complex issues that require more traces. Running this scenario for longer periods increases the overall size of diagnostics output, depending on the size of the VM and the trace options that are selected. This analysis takes 30 seconds to 15 minutes to run, depending on the selected duration. [Learn more](./how-to-use-perfinsights.md)</li><br/><li>**Azure file analysis** [*Windows only*]<br/>Includes all checks in the **Performance analysis** scenario, and captures a network trace and Server Message Block (SMB) counters. Use this scenario to troubleshoot the performance of Azure files. This analysis takes 30 seconds to 15 minutes to run, depending on the selected duration. [Learn more](./how-to-use-perfinsights.md)</li></ul> |
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|**Storage account**| Optionally, if you want to use a single storage account to store the Performance Diagnostics results for multiple VMs, you can select a storage account from the drop-down menu. If you don't specify a storage account, Performance Diagnostics uses the default diagnostics storage account or creates a new storage account. |
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|[Authentication method](#authentication-methods)|Performance Diagnostics supports three authentication methods to write performance diagnostics data to the storage account. They are system-assigned managed identity (default), user-assigned managed identity and storage account access keys. If system-assigned managed identity is selected but not enabled for the VM, Performance Diagnostics will attempt to enable it. If the current user lacks the necessary permissions, this operation may fail. Learn more. |
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|[Authentication method](#authentication-methods)|Performance Diagnostics supports three authentication methods to write performance diagnostics data to the storage account. They are system-assigned managed identity (default), user-assigned managed identity and storage account access keys. If system-assigned managed identity is selected but not enabled for the VM, Performance Diagnostics attempts to enable it. If the current user lacks the necessary permissions, this operation might fail.|
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5. Review the legal terms and privacy policy, and select the corresponding checkbox to acknowledge acceptance (*required*).
This is the default authentication method. If system-assigned managed identity is selected but not enabled for the VM, Performance Diagnostics will attempt to enable it. If the current user lacks the necessary permissions, this operation may fail. Performance Diagnostics will add the **Storage Table Data Contributor** role and the **Storage Blob Data Contributor** role for the storage account, to the system-assigned managed identity. For more information, see [How to enable system-assigned managed identity on an existing VM](/entra/identity/managed-identities-azure-resources/how-to-configure-managed-identities#enable-system-assigned-managed-identity-on-an-existing-vm).
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This is the default authentication method. If system-assigned managed identity is selected but not enabled for the VM, Performance Diagnostics attempts to enable it. If the current user lacks the necessary permissions, this operation might fail. Performance Diagnostics adds the **Storage Table Data Contributor** role and the **Storage Blob Data Contributor** role for the storage account, to the system-assigned managed identity. For more information, see [How to enable system-assigned managed identity on an existing VM](/entra/identity/managed-identities-azure-resources/how-to-configure-managed-identities#enable-system-assigned-managed-identity-on-an-existing-vm).
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- User-assigned managed identity
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User can select one from a list of user-assigned managed identities associated with the VM. Performance Diagnostics will add the **Storage Table Data Contributor** role and the **Storage Blob Data Contributor** role for the storage account, to the user-assigned managed identity. For more information, see [How to assign a user-assigned managed identity to an existing VM](/entra/identity/managed-identities-azure-resources/how-to-configure-managed-identities#assign-a-user-assigned-managed-identity-to-an-existing-vm).
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The user can select one from a list of user-assigned managed identities associated with the VM. Performance Diagnostics adds the **Storage Table Data Contributor** role and the **Storage Blob Data Contributor** role for the storage account, to the user-assigned managed identity. For more information, see [How to assign a user-assigned managed identity to an existing VM](/entra/identity/managed-identities-azure-resources/how-to-configure-managed-identities#assign-a-user-assigned-managed-identity-to-an-existing-vm).
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- Storage account access keys
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User can select storage account access keys. If **Allow storage account key access** is disabled for the storage account, the installation operation will fail. For more information, see [Shared key authorization](/azure/storage/common/shared-key-authorization-prevent#disable-shared-key-authorization).
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The user can select storage account access keys. If **Allow storage account key access** is disabled for the storage account, the installation operation fails. For more information, see [Shared key authorization](/azure/storage/common/shared-key-authorization-prevent#disable-shared-key-authorization).
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To change the authentication method, uninstall Performance Diagnostics and reinstall it.
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> [!NOTE]
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> Once the managed identities are linked to the VM, it may take a few minutes for them to be propagated and recognized by Performance Diagnostics. If the installation fails, wait a few minutes and try again.
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> Once the managed identities are linked to the VM, it might take a few minutes for them to be propagated and recognized by Performance Diagnostics. If the installation fails, wait a few minutes and try again.
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