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articles/storage/common/redundancy-migration.md

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ms.service: storage
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ms.topic: how-to
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ms.date: 02/04/2023
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ms.date: 02/27/2023
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ms.author: jammart
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ms.subservice: common
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ms.custom: devx-track-azurepowershell, engagement-fy23
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- **Zone redundancy** - whether data is replicated between different zones within the primary region (LRS vs. ZRS)
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- **Geo-redundancy** - replication within a single "local" region or between different regions (LRS vs. GRS)
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- **Read access (RA)** - read access to the secondary region in the event of a failover when geo-redundancy is used (GRS vs. RA-GRS)
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- **Read access (RA)** - read access to the secondary region when geo-redundancy is used (GRS vs. RA-GRS)
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For an overview of all of the redundancy options, see [Azure Storage redundancy](storage-redundancy.md).
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> [!NOTE]
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> Manual migration is an option for any scenario in which you want to change the replication setting within the [limitations for changing replication types](#limitations-for-changing-replication-types). That option has been omitted from the table below to simplify it.
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| Switching | …to LRS | …to GRS/RA-GRS <sup>2,6</sup> | …to ZRS | …to GZRS/RA-GZRS <sup>2,6</sup> |
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| Switching | …to LRS | …to GRS/RA-GRS <sup>6</sup> | …to ZRS | …to GZRS/RA-GZRS <sup>2,6</sup> |
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|--------------------|----------------------------------------------------|---------------------------------------------------------------------|----------------------------------------------------|---------------------------------------------------------------------|
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| **…from LRS** | **N/A** | [Use Azure portal, PowerShell, or CLI](#change-the-replication-setting-using-the-portal-powershell-or-the-cli) <sup>1</sup> | [Perform a conversion](#perform-a-conversion)<sup>3,4,5</sup> | [Switch to GRS/RA-GRS first](#change-the-replication-setting-using-the-portal-powershell-or-the-cli) <sup>1</sup>, then [perform a conversion](#perform-a-conversion) to GZRS/RA-GZRS <sup>3,4,5</sup> |
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| **…from LRS** | **N/A** | [Use Azure portal, PowerShell, or CLI](#change-the-replication-setting-using-the-portal-powershell-or-the-cli) <sup>1,2</sup> | [Perform a conversion](#perform-a-conversion)<sup>2,3,4,5</sup> | [Switch to GRS/RA-GRS first](#change-the-replication-setting-using-the-portal-powershell-or-the-cli) <sup>1</sup>, then [perform a conversion](#perform-a-conversion) to GZRS/RA-GZRS <sup>3,4,5</sup> |
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| **…from GRS/RA-GRS** | [Use Azure portal, PowerShell, or CLI](#change-the-replication-setting-using-the-portal-powershell-or-the-cli) | **N/A** | [Switch to LRS first](#change-the-replication-setting-using-the-portal-powershell-or-the-cli), then [perform a conversion](#perform-a-conversion) to ZRS <sup>3,5</sup> | [Perform a conversion](#perform-a-conversion)<sup>3,5</sup> |
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| **…from ZRS** | [Perform a conversion](#perform-a-conversion)<sup>3</sup> | [Switch to GZRS/RA-GZRS first](#change-the-replication-setting-using-the-portal-powershell-or-the-cli)<sup>1</sup>, then [perform a conversion](#perform-a-conversion) to GRS/RA-GRS<sup>3</sup> | **N/A** | [Use Azure portal, PowerShell, or CLI](#change-the-replication-setting-using-the-portal-powershell-or-the-cli) <sup>1</sup> |
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| **…from GZRS/RA-GZRS** | [Switch to ZRS first](#change-the-replication-setting-using-the-portal-powershell-or-the-cli), then [perform a conversion](#perform-a-conversion) to LRS <sup>3</sup> | [Perform a conversion](#perform-a-conversion)<sup>3</sup> | [Use Azure portal, PowerShell, or CLI](#change-the-replication-setting-using-the-portal-powershell-or-the-cli)| **N/A** |
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In most cases you can use the Azure portal, PowerShell, or the Azure CLI to change the geo-redundant or read access (RA) replication setting for a storage account. If you are initiating a zone redundancy conversion, you can change the setting from within the Azure portal, but not from PowerShell or the Azure CLI.
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Changing how your storage account is replicated in the portal does not result in down time for your applications. This includes changes that require a conversion.
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Changing how your storage account is replicated in the Azure portal does not result in down time for your applications. This includes changes that require a conversion.
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# [Portal](#tab/portal)
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- **Problem type**: Choose **Data Migration**.
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- **Problem subtype**: Choose **Migrate to ZRS, GZRS, or RA-GZRS**.
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:::image type="content" source="media/redundancy-migration/request-live-migration-problem-desc-portal.png" alt-text="Screenshot showing how to request a conversion - Problem description tab.":::
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:::image type="content" source="media/redundancy-migration/request-live-migration-problem-desc-portal.png" alt-text="Screenshot showing how to request a conversion - Problem description tab." lightbox="media/redundancy-migration/request-live-migration-problem-desc-portal.png":::
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1. Select **Next**. The **Recommended solution** tab might be displayed briefly before it switches to the **Solutions** page. On the **Solutions** page, you can check the eligibility of your storage account(s) for conversion:
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- **Target replication type**: (choose the desired option from the drop-down)
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- **Storage accounts from**: (enter a single storage account name or a list of accounts separated by semicolons)
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- Select **Submit**.
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:::image type="content" source="media/redundancy-migration/request-live-migration-solutions-portal.png" alt-text="Screenshot showing how to check the eligibility of your storage account(s) for conversion - Solutions page.":::
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:::image type="content" source="media/redundancy-migration/request-live-migration-solutions-portal.png" alt-text="Screenshot showing how to check the eligibility of your storage account(s) for conversion - Solutions page." lightbox="media/redundancy-migration/request-live-migration-solutions-portal.png":::
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1. Take the appropriate action if the results indicate your storage account is not eligible for conversion. If it is eligible, select **Return to support request**.
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1. Select **Next**. If you have more than one storage account to migrate, on the **Details** tab, specify the name for each account, separated by a semicolon.
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:::image type="content" source="media/redundancy-migration/request-live-migration-details-portal.png" alt-text="Screenshot showing how to request a conversion - Additional details tab.":::
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:::image type="content" source="media/redundancy-migration/request-live-migration-details-portal.png" alt-text="Screenshot showing how to request a conversion - Additional details tab." lightbox="media/redundancy-migration/request-live-migration-details-portal.png":::
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1. Fill out the additional required information on the **Additional details** tab, then select **Review + create** to review and submit your support ticket. A support person will contact you to provide any assistance you may need.
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### Manual migration
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A manual migration provides more flexibility and control than a conversion. You can use this option if you need the migration to complete by a certain date, or if conversion is [not supported for your scenario](#limitations-for-changing-replication-types). Manual migration is also useful when moving a storage account to another region. See [Move an Azure Storage account to another region](storage-account-move.md) for more details.
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A manual migration provides more flexibility and control than a conversion. You can use this option if you need your data moved by a certain date, or if conversion is [not supported for your scenario](#limitations-for-changing-replication-types). Manual migration is also useful when moving a storage account to another region. See [Move an Azure Storage account to another region](storage-account-move.md) for more details.
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You must perform a manual migration if:
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### Access tier
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Make sure your target redundancy option supports the access tiers currently used in the storage account. For example, ZRS, GZRS and RA-GZRS storage accounts do not support the archive tier. See [Hot, Cool, and Archive access tiers for blob data](../blobs/access-tiers-overview.md) for more details. To convert an LRS, GRS or RA-GRS account to one that supports zone-redundancy, move the archived blobs to a storage account that supports blobs in the archive tier, then convert the source account to ZRS, GZRS and RA-GZRS.
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Make sure the desired redundancy option supports the access tiers currently used in the storage account. For example, ZRS, GZRS and RA-GZRS storage accounts do not support the archive tier. See [Hot, Cool, and Archive access tiers for blob data](../blobs/access-tiers-overview.md) for more details. To convert an LRS, GRS or RA-GRS account to one that supports zone-redundancy, move the archived blobs to a storage account that supports blobs in the archive tier, then convert the source account to ZRS, GZRS and RA-GZRS.
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To switch an LRS storage account that contains blobs in the archive tier to GRS or RA-GRS, you must first rehydrate all archived blobs to the Hot or Cool tier or perform a [manual migration](#manual-migration).
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After an account failover to the secondary region, it's possible to initiate a failback from the new primary back to the new secondary with PowerShell or Azure CLI (version 2.30.0 or later). For more information, see [use caution when failing back to the original primary](storage-disaster-recovery-guidance.md#use-caution-when-failing-back-to-the-original-primary).
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If you performed an [account failover](storage-disaster-recovery-guidance.md) for your (RA-)GRS or (RA-)GZRS account, the account is locally redundant (LRS) in the new primary region after the failover. Conversion to ZRS or GZRS for an LRS account resulting from a failover is not supported. This is true even in the case of so-called failback operations. For example, if you perform an account failover from RA-GZRS to the LRS in the secondary region, and then configure it again to RA-GRS and perform another account failover to the original primary region, you can't perform a conversion to RA-GZRS in the primary region. Instead, you'll need to perform a manual migration to ZRS or GZRS.
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If you performed an [account failover](storage-disaster-recovery-guidance.md) for your (RA-)GRS or (RA-)GZRS account, the account is locally redundant (LRS) in the new primary region after the failover. Conversion to ZRS or GZRS for an LRS account resulting from a failover is not supported. This is true even in the case of so-called failback operations. For example, if you perform an account failover from RA-GZRS to LRS in the secondary region, and then configure it again to RA-GRS and perform another account failover to the original primary region, you can't perform a conversion to RA-GZRS in the primary region. Instead, you'll need to perform a manual migration to ZRS or GZRS.
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## Downtime requirements
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During a [conversion](#perform-a-conversion), you can access data in your storage account with no loss of durability or availability. [The Azure Storage SLA](https://azure.microsoft.com/support/legal/sla/storage/) is maintained during the migration process and there is no data loss associated with a conversion. Service endpoints, access keys, shared access signatures, and other account options remain unchanged after the migration.
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If you initiate a conversion from the Azure portal, the migration process could take up to 72 hours to begin, and possibly longer if requested by opening a support request.
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If you initiate a conversion from the Azure portal, the conversion process could take up to 72 hours to begin, and possibly longer if requested by opening a support request.
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If you choose to perform a manual migration, downtime is required but you have more control over the timing of the migration process.
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