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Copy file name to clipboardExpand all lines: articles/migrate/troubleshoot-assessment-faq.md
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@@ -19,8 +19,8 @@ This article provides answers to some of the most common questions about trouble
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Azure VM assessment might recommend a bigger disk based on the type of assessment:
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- Disk sizing depends on two assessment properties: sizing criteria and storage type.
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- If the sizing criteria is**Performance-based** and the storage type is set to **Automatic**, the IOPS and throughput values of the disk are considered when identifying the target disk type (Standard HDD, Standard SSD, Premium, or Ultra disk). A disk SKU from the disk type is then recommended, and the recommendation considers the size requirements of the on-premises disk.
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- If the sizing criteria is**Performance-based** and the storage type is **Premium**, a premium disk SKU in Azure is recommended based on the IOPS, throughput, and size requirements of the on-premises disk. The same logic is used to perform disk sizing when the sizing criteria is **As on-premises** and the storage type is **Standard HDD**, **Standard SSD**, **Premium**, or **Ultra disk**.
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- If the sizing criteria are**Performance-based** and the storage type is set to **Automatic**, the IOPS and throughput values of the disk are considered when identifying the target disk type (Standard HDD, Standard SSD, Premium, or Ultra disk). A disk SKU from the disk type is then recommended, and the recommendation considers the size requirements of the on-premises disk.
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- If the sizing criteria are**Performance-based** and the storage type is **Premium**, a premium disk SKU in Azure is recommended based on the IOPS, throughput, and size requirements of the on-premises disk. The same logic is used to perform disk sizing when the sizing criteria is **As on-premises** and the storage type is **Standard HDD**, **Standard SSD**, **Premium**, or **Ultra disk**.
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For example, say you have an on-premises disk with 32 GB of memory, but the aggregated read and write IOPS for the disk is 800 IOPS. The Azure VM assessment recommends a premium disk because of the higher IOPS requirements. It also recommends a disk SKU that can support the required IOPS and size. The nearest match in this example would be P15 (256 GB, 1100 IOPS). Even though the size required by the on-premises disk was 32 GB, the Azure VM assessment recommended a larger disk because of the high IOPS requirement of the on-premises disk.
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- If the VMs are powered on for the duration for which you're creating the assessment.
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- If only memory counters are missing and you're trying to assess Hyper-V VMs, check if you have dynamic memory enabled on these VMs. Because of a known issue, currently the Azure Migrate appliance can't collect memory utilization for such VMs.
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- If all of the performance counters are missing, ensure the port access requirements for assessment are met. Learn more about the port access requirements for [VMware](./migrate-support-matrix-vmware.md#port-access-requirements), [Hyper-V](./migrate-support-matrix-hyper-v.md#port-access), and [physical](./migrate-support-matrix-physical.md#port-access) assessments.
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If any of the performance counters are missing, Azure Migrate: Discovery and assessment falls back to the allocated cores/memory on-premises and recommends a VM size accordingly.
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If any of the performance counters are missing, Azure Migrate: Discovery and assessment fall back to the allocated cores/memory on-premises and recommends a VM size accordingly.
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## Why is performance data missing for some or all servers in my Azure VM or Azure VMware Solution assessment report?
Copy file name to clipboardExpand all lines: articles/migrate/troubleshoot-assessment.md
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#### Fix
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One or more disks attached to the VM don't meet Azure requirements.<br><br> Azure Migrate: Discovery and assessment assesses the disks based on the disk limits for Ultra disks (64 TB).<br><br> For each disk attached to the VM, make sure that the size of the disk is < 64 TB (supported by Ultra SSD disks).<br><br> If it isn't, reduce the disk size before you migrate to Azure, or use multiple disks in Azure and [stripe them together](../virtual-machines/premium-storage-performance.md#disk-striping) to get higher storage limits. Make sure that the performance (IOPS and throughput) needed by each disk is supported by [Azure managed virtual machine disks](../azure-resource-manager/management/azure-subscription-service-limits.md#azure-storage-limits).
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One or more disks attached to the VM don't meet Azure requirements.<br><br> Azure Migrate: Discovery and assessment assess the disks based on the disk limits for Ultra disks (64 TB).<br><br> For each disk attached to the VM, make sure that the size of the disk is < 64 TB (supported by Ultra SSD disks).<br><br> If it isn't, reduce the disk size before you migrate to Azure, or use multiple disks in Azure and [stripe them together](../virtual-machines/premium-storage-performance.md#disk-striping) to get higher storage limits. Make sure that the performance (IOPS and throughput) needed by each disk is supported by [Azure managed virtual machine disks](../azure-resource-manager/management/azure-subscription-service-limits.md#azure-storage-limits).
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### Issue: One or more unsuitable network adapters
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#### Fix
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Azure Migrate: Discovery and assessment supports disks with up to 64 TB size (Ultra disks). Shrink disks to less than 64 TB before migration, or use multiple disks in Azure and [stripe them together](../virtual-machines/premium-storage-performance.md#disk-striping) to get higher storage limits.
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Azure Migrate: Discovery and assessment support disks with up to 64 TB size (Ultra disks). Shrink disks to less than 64 TB before migration, or use multiple disks in Azure and [stripe them together](../virtual-machines/premium-storage-performance.md#disk-striping) to get higher storage limits.
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### Issue: Disk unavailable in the specified location
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#### Recommended Action
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App Service supported authentication types and configuration are different from on-premises IIS. Disable the unsupported authentication types on the site. After the migration is complete, it will be possible to configure the site by using one of the App Service supported authentication types.
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App Service supported authentication types and configuration are different from on-premises IIS. Disable the unsupported authentication types on the site. After the migration is complete, it will be possible to configure the site by using one of the App Services supported authentication types.
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### Error: Authorization check unknown
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#### Recommended Action
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Unable to determine authentication types. Fix all configuration errors and confirm that all site content locations are accessible to the administrators group.
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Unable to determine authentication types. Fix all configuration errors and confirm that all site content locations are accessible to the administrator's group.
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### Error: Configuration error check
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#### Recommended Action
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Content must be accessible to migrate the site. Confirm that the site isn't using UNC shares for content and that all site content locations are accessible to the administrators group.
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Content must be accessible to migrate the site. Confirm that the site isn't using UNC shares for content and that all site content locations are accessible to the administrator's group.
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