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Copy file name to clipboardExpand all lines: articles/storage/files/files-disaster-recovery.md
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@@ -15,6 +15,20 @@ Microsoft strives to ensure that Azure services are always available. However, u
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> [!IMPORTANT]
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> Azure File Sync only supports storage account failover if the Storage Sync Service is also failed over. This is because Azure File Sync requires the storage account and Storage Sync Service to be in the same Azure region. If only the storage account is failed over, sync and cloud tiering operations will fail until the Storage Sync Service is failed over to the secondary region. If you want to fail over a storage account containing Azure file shares that are being used as cloud endpoints in Azure File Sync, see [Azure File Sync disaster recovery best practices](../file-sync/file-sync-disaster-recovery-best-practices.md) and [Azure File Sync server recovery](../file-sync/file-sync-server-recovery.md).
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## Applies to
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| Management model | Billing model | Media tier | Redundancy | SMB | NFS |
Customer-managed planned failover can also be utilized in multiple scenarios, including planned disaster recovery testing, a proactive approach to large scale disasters, or to recover from non-storage related outages.
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Azure Files offers different redundancy options to protect your data from planned and unplanned events ranging from transient hardware failures, network and power outages, to natural disasters. All Azure file shares can use locally redundant (LRS) or zone-redundant storage (ZRS). For more information, see [Azure Files redundancy](files-redundancy.md).
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Azure Files supports account failover for standard storage accounts configured with geo-redundant storage (GRS) and geo-zone redundant storage (GZRS) for protection against regional outages. With account failover, you can initiate the failover process for your storage account if the primary endpoint becomes unavailable. The failover updates the secondary endpoint to become the primary endpoint for your storage account. Once the failover is complete, clients can begin writing to the new primary endpoint.
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Azure Files supports account failover for HDD file shares configured with geo-redundant storage (GRS) and geo-zone redundant storage (GZRS) for protection against regional outages. With account failover, you can initiate the failover process for your storage account if the primary endpoint becomes unavailable. The failover updates the secondary endpoint to become the primary endpoint for your storage account. Once the failover is complete, clients can begin writing to the new primary endpoint.
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GRS and GZRS still carry a [risk of data loss](#anticipate-data-loss) because data is copied to the secondary region asynchronously, meaning there's a delay before a write to the primary region is copied to the secondary region. In the event of an outage, write operations to the primary endpoint that haven't yet been copied to the secondary endpoint will be lost. This means a failure that affects the primary region might result in data loss if the primary region can't be recovered. The interval between the most recent writes to the primary region and the last write to the secondary region is the RPO. Azure Files typically has an RPO of 15 minutes or less, although there's currently no SLA on how long it takes to replicate data to the secondary region.
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> [!IMPORTANT]
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> GRS/GZRS aren't supported for premium Azure file shares. However, you can [sync between two Azure file shares](https://github.com/Azure-Samples/azure-files-samples/tree/master/SyncBetweenTwoAzureFileSharesForDR) to achieve geographic redundancy.
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> GRS/GZRS aren't supported for SSD file shares. However, you can [sync between two Azure file shares](https://github.com/Azure-Samples/azure-files-samples/tree/master/SyncBetweenTwoAzureFileSharesForDR) to achieve geographic redundancy.
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