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Copy file name to clipboardExpand all lines: articles/azure-netapp-files/cross-region-replication-requirements-considerations.md
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author: b-hchen
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ms.service: azure-netapp-files
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ms.topic: conceptual
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ms.date: 09/12/2024
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ms.date: 02/13/2025
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ms.author: anfdocs
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*[Large volumes](large-volumes-requirements-considerations.md) are supported with cross-region replication only with an hourly or daily replication schedule.
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* If the volume's size exceeds 95% utilization, there's a risk that replication to the destination volume can fail depending on the rate of data changes.
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## Large volumes configuration
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[Large volumes](azure-netapp-files-understand-storage-hierarchy.md#large-volumes) are supported with cross-region replication. You must [first register for the large volumes feature](large-volumes-requirements-considerations.md#register-the-feature) then register to use large volumes with cross-region replication:
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>[!NOTE]
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>Cross-zone and cross-region replication use the same Azure Feature Exposure Control (AFEC) name of `ANFLargeVolumesCRR`. If you've registered for cross-zone replication, the registration also works for cross-region replication.
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1. Register the feature by running the following commands:
> The **RegistrationState** may be in the `Registering` state for up to 60 minutes before changing to `Registered`. Wait until the status is `Registered` before continuing.
You can also use [Azure CLI commands](/cli/azure/feature) `az feature register` and `az feature show` to register the feature and display the registration status.
Copy file name to clipboardExpand all lines: articles/azure-netapp-files/cross-zone-replication-requirements-considerations.md
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ms.service: azure-netapp-files
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ms.topic: conceptual
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# Requirements and considerations for using cross-zone replication
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* Azure NetApp Files replication doesn't currently support multiple subscriptions; all replications must be performed under a single subscription.
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* See [resource limits](azure-netapp-files-resource-limits.md) for the maximum number of cross-zone destination volumes. You can open a support ticket to [request a limit increase](azure-netapp-files-resource-limits.md#request-limit-increase) in the default quota of replication destination volumes (per subscription in a region).
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* There can be a delay up to five minutes for the interface to reflect a newly added snapshot on the source volume.
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* Cross-zone replication does not support cascading and fan in/out topologies.
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* After you set up cross-zone replication, the replication process creates *SnapMirror snapshots* to provide references between the source volume and the destination volume. SnapMirror snapshots are cycled automatically when a new one is created for every incremental transfer. You cannot delete SnapMirror snapshots until you delete the replication relationship and volume.
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* You cannot mount a dual-protocol volume until you [authorize replication from the source volume](cross-region-replication-create-peering.md#authorize-replication-from-the-source-volume) and the initial [transfer](cross-region-replication-display-health-status.md#display-replication-status) happens.
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* You can delete manual snapshots on the source volume of a replication relationship when the replication relationship is active or broken, and also after you've deleted replication relationship. You cannot delete manual snapshots for the destination volume until you break the replication relationship.
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* When reverting a source volume with an active volume replication relationship, only snapshots that are more recent than the SnapMirror snapshot can be used in the revert operation. For more information, see [Revert a volume using snapshot revert with Azure NetApp Files](snapshots-revert-volume.md).
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* Cross-zone replication doesn't support cascading and fan in/out topologies.
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* After you set up cross-zone replication, the replication process creates *SnapMirror snapshots* to provide references between the source volume and the destination volume. SnapMirror snapshots are cycled automatically when a new one is created for every incremental transfer. You can't delete SnapMirror snapshots until you delete the replication relationship and volume.
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* You can't mount a dual-protocol volume until you [authorize replication from the source volume](cross-region-replication-create-peering.md#authorize-replication-from-the-source-volume) and the initial [transfer](cross-region-replication-display-health-status.md#display-replication-status) happens.
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* You can delete manual snapshots on the source volume of a replication relationship when the replication relationship is active or broken, and also after you've deleted replication relationship. You can't delete manual snapshots for the destination volume until you break the replication relationship.
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* When you revert a source volume with an active volume replication relationship, only snapshots dated more recently than the SnapMirror snapshot can be used in the revert operation. For more information, see [Revert a volume using snapshot revert with Azure NetApp Files](snapshots-revert-volume.md).
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* Data replication volumes support [customer-managed keys](configure-customer-managed-keys.md).
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*[Large volumes](large-volumes-requirements-considerations.md) are supported with cross-zone replication only with an hourly or daily replication schedule.
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## Large volumes configuration
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[Large volumes](azure-netapp-files-understand-storage-hierarchy.md#large-volumes) are supported in cross-zone replication. You must [first register for the large volumes feature](large-volumes-requirements-considerations.md#register-the-feature) then register to use large volumes with cross-zone replication:
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>[!NOTE]
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>Cross-zone and cross-region replication use the same Azure Feature Exposure Control (AFEC) name of `ANFLargeVolumesCRR`. If you've registered for cross-region replication, the registration also works for cross-zone replication.
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1. Register the feature by running the following commands:
> The **RegistrationState** may be in the `Registering` state for up to 60 minutes before changing to `Registered`. Wait until the status is `Registered` before continuing.
You can also use [Azure CLI commands](/cli/azure/feature) `az feature register` and `az feature show` to register the feature and display the registration status.
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