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This article shows you how to simplify the migration by using the Azure portal.
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> [!NOTE]
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> Azure Data Lake Storage Gen1 is now retired. See the retirement announcement [here](https://aka.ms/data-lake-storage-gen1-retirement-announcement).Data Lake Storage Gen1 resources are no longer accessible. If you require special assistance, please [contact us](https://portal.azure.com/#view/Microsoft_Azure_Support/HelpAndSupportBlade/overview).
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> Azure Data Lake Storage Gen1 is now retired. See the retirement announcement [here](https://aka.ms/data-lake-storage-gen1-retirement-announcement).Data Lake Storage Gen1 resources are no longer accessible. If you require special assistance, please [contact us](https://portal.azure.com/#view/Microsoft_Azure_Support/HelpAndSupportBlade/overview).
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Here's a video that tells you more about it.
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3. Select the **Migrate data** button.
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4. Select **Copy data to a new Gen2 account**.
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5. Give Microsoft consent to perform the data migration by selecting the checkbox. Then, select the **Apply** button.
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A progress bar appears along with a sub status message. You can use these indicators to gauge the progress of the migration. Because the time to complete each task varies, the progress bar won't advance at a consistent rate. For example, the progress bar might quickly advance to 50 percent, but then take a bit more time to complete the remaining 50 percent.
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You can stop the migration at any time by selecting the **Stop migration** button.
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A progress bar appears along with a sub status message. You can use these indicators to gauge the progress of the migration. Because the time to complete each task varies, the progress bar won't advance at a consistent rate. For example, the progress bar might quickly advance to 50 percent, but then take a bit more time to complete the remaining 50 percent.
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You can stop the migration at any time before the URI is redirected by selecting the **Stop migration** button.
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## Step 6: Verify that the migration completed
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If you used [Option 1: Copy data from Gen1 to Gen2](#option-1-copy-data-from-gen1-to-gen2) mentioned above, then both the Gen1 and Gen2 accounts are available for reads and writes post migration. However, if you used [Option 2: Perform a complete migration](#option-2-perform-a-complete-migration), then going back to the Gen1 account isn't supported. In Option 2, after the migration completes, the data in your Gen1 account won't be accessible and will be deleted after 30 days. You can continue to view the Gen1 account in the Azure portal, and when you're ready, you can delete the Gen1 account.
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#### I would like to enable Geo-redundant storage (GRS) on the Gen2-enabled account, how do I do that?
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#### I would like to enable Geo-redundant storage (GRS) on the Gen2-enabled account. How do I do that?
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Once the migration is complete, both in "Copy data" and "Complete migration" options, you can go ahead and change the redundancy option to GRS as long as you don't plan to use the application compatibility layer. The application compatibility won't work on accounts that use GRS redundancy.
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When you copy the data over to your Gen2-enabled account, two factors that can affect performance are the number of files and the amount of metadata you have. For example, many small files can affect the performance of the migration.
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#### Will WebHDFS File System APIs supported on Gen2 account postmigration?
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#### Will WebHDFS File System APIs be supported on Gen2 account post-migration?
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WebHDFS File System APIs of Gen1 will be supported on Gen2 but with certain deviations, and only limited functionality is supported via the compatibility layer. Customers should plan to leverage Gen2-specific APIs for better performance and features.
You can migrate your data, workloads, and applications from Azure Data Lake Storage Gen1 to Azure Data Lake Storage Gen2. This article explains the recommended migration approach and covers the different migration patterns and when to use each. For easier reading, this article uses the term *Gen1* to refer to Azure Data Lake Storage Gen1, and the term *Gen2* to refer to Azure Data Lake Storage Gen2.
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> [!NOTE]
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> Azure Data Lake Storage Gen1 is now retired. See the retirement announcement [here](https://aka.ms/data-lake-storage-gen1-retirement-announcement).Data Lake Storage Gen1 resources are no longer accessible. If you require special assistance, please [contact us](https://portal.azure.com/#view/Microsoft_Azure_Support/HelpAndSupportBlade/overview).
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> Azure Data Lake Storage Gen1 is now retired. See the retirement announcement [here](https://aka.ms/data-lake-storage-gen1-retirement-announcement).Data Lake Storage Gen1 resources are no longer accessible. If you require special assistance, please [contact us](https://portal.azure.com/#view/Microsoft_Azure_Support/HelpAndSupportBlade/overview).
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Azure Data Lake Storage Gen2 is built on [Azure Blob storage](storage-blobs-introduction.md) and provides a set of capabilities dedicated to big data analytics. [Data Lake Storage Gen2](https://azure.microsoft.com/services/storage/data-lake-storage/) combines features from [Azure Data Lake Storage Gen1](../../data-lake-store/index.yml), such as file system semantics, directory, and file level security and scale with low-cost, tiered storage, high availability/disaster recovery capabilities from [Azure Blob storage](storage-blobs-introduction.md).
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Check out our sample code for the lift and shift pattern in our [Lift and Shift migration sample](https://github.com/Azure/adlsgen1togen2migration/tree/main/3-Migrate/Lift%20and%20Shift).
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#### Considerations for using the lift and shift pattern
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Check out our sample code for the incremental copy pattern in our [Incremental copy migration sample](https://github.com/Azure/adlsgen1togen2migration/tree/main/3-Migrate/Incremental).
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#### Considerations for using the incremental copy pattern:
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#### Considerations for using the incremental copy pattern
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- Cutover from Gen1 to Gen2 for all workloads at the same time.
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Check out our sample code for the dual pipeline pattern in our [Dual Pipeline migration sample](https://github.com/Azure/adlsgen1togen2migration/tree/main/3-Migrate/Dual%20pipeline).
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#### Considerations for using the dual pipeline pattern:
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#### Considerations for using the dual pipeline pattern
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- Gen1 and Gen2 pipelines run side-by-side.
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Check out our sample code for the bidirectional sync pattern in our [Bidirectional Sync migration sample](https://github.com/Azure/adlsgen1togen2migration/tree/main/3-Migrate/Bi-directional).
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