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Resource limits for Azure NetApp Files

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Understanding resource limits for Azure NetApp Files helps you manage your volumes.

Resource limits

The following table describes resource limits for Azure NetApp Files:

Resource Default limit Adjustable via support request
Regional capacity quota per subscription 25 TiB Yes
Number of NetApp accounts per Azure region per subscription 10 Yes
Number of capacity pools per NetApp account 25 Yes
Number of volumes per subscription 500 Yes
Number of volumes per capacity pool 500 Yes
Number of snapshots per volume 255 No
Number of IPs in a virtual network (including immediately peered VNets) accessing volumes in an Azure NetApp Files hosting VNet No
Minimum size of a single capacity pool 2 TiB* No
Maximum size of a single capacity pool 500 TiB Yes
Minimum size of a single regular volume 100 GiB No
Maximum size of a single regular volume 100 TiB No
Minimum size of a single large volume 102,401 GiB No
Maximum size of a single large volume 500 TiB No
Maximum size of a single file 16 TiB No
Maximum size of directory metadata in a single directory 320 MB No
Maximum number of files in a single directory Approximately 4 million.
See Determine if a directory is approaching the limit size.		 No
Maximum number of files maxfiles per volume 106,255,630 Yes
Maximum number of export policy rules per volume 5 No
Maximum number of quota rules per volume 100 Yes
Minimum assigned throughput for a manual QoS volume 1 MiB/s No
Maximum assigned throughput for a manual QoS volume 4,500 MiB/s No
Number of cross-region replication data protection volumes (destination volumes) 10 Yes
Number of cross-zone replication data protection volumes (destination volumes) 10 Yes
Maximum numbers of policy-based (scheduled) backups per volume
  • Daily retention count: 2 (minimum) to 1019 (maximum)
  • Weekly retention count: 1 (minimum) to 1019 (maximum)
  • Monthly retention count: 1 (minimum) to 1019 (maximum)

    • The maximum hourly, daily, weekly, and monthly backup retention counts combined is 1019.
 N
Maximum size of protected volume 100 TiB N
Maximum number of volumes that can be backed up per subscription 5 Y
Maximum number of manual backups per volume per day 5 Y

* 2-TiB capacity pool sizing is currently in preview. You can only take advantage of the 2-TiB minimum if all the volumes in the capacity pool are using Standard network features. If any volume is using Basic network features, the minimum size is 4 TiB.

For more information, see Capacity management FAQs.

For limits and constraints related to Azure NetApp Files network features, see Guidelines for Azure NetApp Files network planning.

Determine if a directory is approaching the limit size

You can use the stat command from a client to see whether a directory is approaching the maximum size limit for directory metadata (320 MB). If you reach the maximum size limit for a single directory for Azure NetApp Files, the error No space left on device occurs.

For a 320-MB directory, the number of blocks is 655360, with each block size being 512 bytes. (That is, 320x1024x1024/512.) This number translates to approximately 4 million files maximum for a 320-MB directory. However, the actual number of maximum files might be lower, depending on factors such as the number of files with non-ASCII characters in the directory. As such, you should use the stat command as follows to determine whether your directory is approaching its limit.

Examples:

[makam@cycrh6rtp07 ~]$ stat bin
File: 'bin'
Size: 4096            Blocks: 8          IO Block: 65536  directory

[makam@cycrh6rtp07 ~]$ stat tmp
File: 'tmp'
Size: 12288           Blocks: 24         IO Block: 65536  directory
 
[makam@cycrh6rtp07 ~]$ stat tmp1
File: 'tmp1'
Size: 4096            Blocks: 8          IO Block: 65536  directory

Maxfiles limits

Azure NetApp Files volumes have a limit called maxfiles. The maxfiles limit is the number of files a volume can contain. Linux file systems refer to the limit as inodes. The maxfiles limit for an Azure NetApp Files volume is indexed based on the size (quota) of the volume. The maxfiles limit for a volume increases or decreases at the rate of 21,251,126 files per TiB of provisioned volume size.

The service dynamically adjusts the maxfiles limit for a volume based on its provisioned size. For example, a volume configured initially with a size of 1 TiB would have a maxfiles limit of 21,251,126. Subsequent changes to the size of the volume would result in an automatic readjustment of the maxfiles limit based on the following rules:

For volumes up to 100 TiB in size:

Volume size (quota) Automatic readjustment of the maxfiles limit
<= 1 TiB 21,251,126
> 1 TiB but <= 2 TiB 42,502,252
> 2 TiB but <= 3 TiB 63,753,378
> 3 TiB but <= 4 TiB 85,004,504
> 4 TiB but <= 100 TiB 106,255,630

Important

If your volume has a volume size (quota) of more than 4 TiB and you want to increase the maxfiles limit, you must initiate a support request.

For volumes 100 TiB or under, if you've allocated at least 5 TiB of quota for a volume, you can initiate a support request to increase the maxfiles (inodes) limit beyond 106,255,630. For every 106,255,630 files you increase (or a fraction thereof), you need to increase the corresponding volume quota by 5 TiB. For example, if you increase the maxfiles limit from 106,255,630 files to 212,511,260 files (or any number in between), you need to increase the volume quota from 5 TiB to 10 TiB.

For volumes 100 TiB or under, you can increase the maxfiles limit up to 531,278,150 if your volume quota is at least 25 TiB.

Important

Once a volume has exceeded a maxfiles limit, you cannot reduce volume size below the quota corresponding to that maxfiles limit even if you have reduced the actual used file count. For example, if you have crossed the 63,753,378 maxfiles limit, the volume quota cannot be reduced below its corresponding index of 2 TiB.

For large volumes:

Volume size (quota) Automatic readjustment of the maxfiles limit
> 100 TiB 2,550,135,120

You can increase the maxfiles limit beyond 2,550,135,120 using a support request. For every 2,550,135,120 files you increase (or a fraction thereof), you need to increase the corresponding volume quota by 120 TiB. For example, if you increase maxfiles limit from 2,550,135,120 to 5,100,270,240 files (or any number in between), you need to increase the volume quota to at least 240 TiB.

The maximum maxfiles value for a 500 TiB volume is 10,625,563,000 files.

You cannot set maxfiles limits for data protection volumes via a quota request. Azure NetApp Files automatically increases the maxfiles limit of a data protection volume to accommodate the number of files replicated to the volume. When a failover happens to a data protection volume, the maxfiles limit remains the last value before the failover. In this situation, you can submit a maxfiles quota request for the volume.

Request limit increase

You can create an Azure support request to increase the adjustable limits from the Resource Limits table.

Note

Depending on available resources in the region and the limit increase requested, Azure support may require additional information in order to determine the feasibility of the request.

  1. Go to New Support Request under Support + troubleshooting.

  2. Under the Problem description tab, provide the required information:

    1. For Issue Type, select Service and Subscription Limits (Quotas).
    2. For Subscription, select your subscription.
    3. For Quota Type, select Storage: Azure NetApp Files limits.

    Screenshot that shows the Problem Description tab.

  3. Under the Additional details tab, select Enter details in the Request Details field.

    Screenshot that shows the Details tab and the Enter Details field.

  4. To request limit increase, provide the following information in the Quota Details window that appears:

    1. In Quota Type, select the type of resource you want to increase.
      For example:

      • Regional Capacity Quota per Subscription (TiB)
      • Number of NetApp accounts per Azure region per subscription
      • Number of volumes per subscription

    2. In Region Requested, select your region.
      The current and default sizes are displayed under Quota State.

    3. Enter a value to request an increase for the quota type you specified.

    Screenshot that shows how to display and request increase for regional quota.

  5. Select Save and continue. Select Review + create to create the request.

Next steps