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Copy file name to clipboardExpand all lines: articles/azure-netapp-files/azure-netapp-files-understand-storage-hierarchy.md
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Before creating a volume in Azure NetApp Files, you must purchase and set up a pool for provisioned capacity. To set up a capacity pool, you must have a NetApp account. Understanding the storage hierarchy helps you set up and manage your Azure NetApp Files resources.
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> [!IMPORTANT]
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> Azure NetApp Files currently does not support resource migration between subscriptions.
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> Azure NetApp Files currently doesn't support resource migration between subscriptions.
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## <aname="conceptual_diagram_of_storage_hierarchy"></a>Conceptual diagram of storage hierarchy
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The following example shows the relationships of the Azure subscription, NetApp accounts, capacity pools, and volumes.
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- A NetApp account serves as an administrative grouping of the constituent capacity pools.
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- A NetApp account is not the same as your general Azure storage account.
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- A NetApp account isn't the same as your general Azure storage account.
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- A NetApp account is regional in scope.
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- You can have multiple NetApp accounts in a region, but each NetApp account is tied to only a single region.
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### General rules of capacity pools
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- A capacity pool is measured by its provisioned capacity.
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See [QoS types](#qos_types) for additional information.
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For more information, see [QoS types](#qos_types).
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- The capacity is provisioned by the fixed SKUs that you purchased (for example, a 4-TiB capacity).
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- A capacity pool can have only one service level.
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- Each capacity pool can belong to only one NetApp account. However, you can have multiple capacity pools within a NetApp account.
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-A capacity pool cannot be moved across NetApp accounts.
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For example, in the [Conceptual diagram of storage hierarchy](#conceptual_diagram_of_storage_hierarchy) below, Capacity Pool 1 cannot be moved from US East NetApp account to US West 2 NetApp account.
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-A capacity pool cannot be deleted until all volumes within the capacity pool have been deleted.
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-You can't move a capacity pool across NetApp accounts.
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For example, in the [Conceptual diagram of storage hierarchy](#conceptual_diagram_of_storage_hierarchy), you can't move Capacity Pool 1 US East NetApp account to US West 2 NetApp account.
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-You can't delete a capacity pool until you delete all volumes within the capacity pool.
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### <aname="qos_types"></a>Quality of Service (QoS) types for capacity pools
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The QoS type is an attribute of a capacity pool. Azure NetApp Files provides two QoS types of capacity pools -- *auto (default)* and *manual*.
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The QoS type is an attribute of a capacity pool. Azure NetApp Files provides two QoS types of capacity pools--*auto (default)* and *manual*.
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#### *Automatic (or auto)* QoS type
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When you create a capacity pool, the default QoS type is auto.
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In an auto QoS capacity pool, throughput is assigned automatically to the volumes in the pool, proportional to the size quota assigned to the volumes.
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The maximum throughput allocated to a volume depends on the service level of the capacity pool and the size quota of the volume. See [Service levels for Azure NetApp Files](azure-netapp-files-service-levels.md) for example calculation.
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The maximum throughput allocated to a volume depends on the service level of the capacity pool and the size quota of the volume. See [Service levels for Azure NetApp Files](azure-netapp-files-service-levels.md) for an example calculation.
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For performance considerations about QoS types, see [Performance considerations for Azure NetApp Files](azure-netapp-files-performance-considerations.md).
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#### *Manual* QoS type
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When you [create a capacity pool](azure-netapp-files-set-up-capacity-pool.md), you can specify for the capacity pool to use the manual QoS type. You can also [change an existing capacity pool](manage-manual-qos-capacity-pool.md#change-to-qos) to use the manual QoS type. *Setting the capacity type to manual QoS is a permanent change.* You cannot convert a manual QoS type capacity tool to an auto QoS capacity pool.
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When you [create a capacity pool](azure-netapp-files-set-up-capacity-pool.md), you can specify for the capacity pool to use the manual QoS type. You can also [change an existing capacity pool](manage-manual-qos-capacity-pool.md#change-to-qos) to use the manual QoS type. *Setting the capacity type to manual QoS is a permanent change.* You can't convert a manual QoS type capacity tool to an auto QoS capacity pool.
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In a manual QoS capacity pool, you can assign the capacity and throughput for a volume independently. For minimum and maximum throughput levels, see [Resource limits for Azure NetApp Files](azure-netapp-files-resource-limits.md#resource-limits). The total throughput of all volumes created with a manual QoS capacity pool is limited by the total throughput of the pool. It is determined by the combination of the pool size and the service-level throughput. For instance, a 4-TiB capacity pool with the Ultra service level has a total throughput capacity of 512 MiB/s (4 TiB x 128 MiB/s/TiB) available for the volumes.
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In a manual QoS capacity pool, you can assign the capacity and throughput for a volume independently. For minimum and maximum throughput levels, see [Resource limits for Azure NetApp Files](azure-netapp-files-resource-limits.md#resource-limits). The total throughput of all volumes created with a manual QoS capacity pool is limited by the total throughput of the pool. It's determined by the combination of the pool size and the service-level throughput. For instance, a 4-TiB capacity pool with the Ultra service level has a total throughput capacity of 512 MiB/s (4 TiB x 128 MiB/s/TiB) available for the volumes.
2 TiB capacity pool sizing is currently in preview. The 2-TiB minimum is only supported with Standard network features. With Basic network features, the minimum size is 4 TiB.
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2-TiB capacity pool sizing is currently in preview. You can only take advantage of the 2-TiB minimum if you are using Standard network features. With Basic network features, the minimum size is 4 TiB.
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