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Service levels for Azure NetApp Files

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Service levels are an attribute of a capacity pool. Service levels are defined and differentiated by the allowed maximum throughput for a volume in the capacity pool based on the quota that is assigned to the volume. Throughput is a combination of read and write speed.

Supported service levels

Azure NetApp Files supports three service levels: Ultra, Premium, and Standard.

  • Standard storage:
    The Standard service level provides up to 16 MiB/s of throughput per 1 TiB of capacity provisioned.

  • Premium storage:
    The Premium service level provides up to 64 MiB/s of throughput per 1 TiB of capacity provisioned.

  • Ultra storage:
    The Ultra service level provides up to 128 MiB/s of throughput per 1 TiB of capacity provisioned.

  • Storage with cool access:
    Cool access storage is available with the Standard, Premium, and Ultra service levels. The throughput experience for any of these service levels with cool access is the same for cool access as it is for data in the hot tier. It may differ when data that resides in the cool tier is accessed. For more information, see Azure NetApp Files storage with cool access and Performance considerations for storage with cool access.

Throughput limits

The throughput limit for a volume is determined by the combination of the following factors:

  • The service level of the capacity pool to which the volume belongs
  • The quota assigned to the volume
  • The QoS type (auto or manual) of the capacity pool

Throughput limit examples of volumes in an auto QoS capacity pool

The following diagram shows throughput limit examples of volumes in an auto QoS capacity pool:

Service level illustration

  • In Example 1, a volume from an auto QoS capacity pool with the Premium storage tier that is assigned 2 TiB of quota will be assigned a throughput limit of 128 MiB/s (2 TiB * 64 MiB/s). This scenario applies regardless of the capacity pool size or the actual volume consumption.

  • In Example 2, a volume from an auto QoS capacity pool with the Premium storage tier that is assigned 100 GiB of quota is assigned a throughput limit of 6.25 MiB/s (0.09765625 TiB * 64 MiB/s). This scenario applies regardless of the capacity pool size or the actual volume consumption.

Throughput limit examples of volumes in a manual QoS capacity pool

If you use a manual QoS capacity pool, you can assign the capacity and throughput for a volume independently. When you create a volume in a manual QoS capacity pool, you can specify the throughput (MiB/S) value. The total throughput assigned to volumes in a manual QoS capacity pool depends on the size of the pool and the service level. Throughput limits are capped by a formula: capacity pool size in TiB x service level throughput/TiB. For instance, a 10-TiB capacity pool with the Ultra service level has a total throughput capacity of 1280 MiB/s (10 TiB x 128 MiB/s/TiB) available for the volumes.

For example, for an SAP HANA system, this capacity pool can be used to create the following volumes. Each volume provides the individual size and throughput to meet your application requirements:

  • SAP HANA data volume: Size 4 TiB with up to 704 MiB/s
  • SAP HANA log volume: Size 0.5 TiB with up to 256 MiB/s
  • SAP HANA shared volume: Size 1 TiB with up to 64 MiB/s
  • SAP HANA backup volume: Size 4.5 TiB with up to 256 MiB/s

The following diagram illustrates the scenarios for the SAP HANA volumes:

QoS SAP HANA volume scenarios

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