What are the limits of Apsara File Storage NAS file systems?

  • Each Alibaba Cloud account can create a maximum of 20 General-purpose NAS file systems and 200 Extreme NAS file systems in a region.
  • The maximum capacity of a Capacity NAS file system is 10 PiB. The maximum capacity of a Performance NAS file system is 1 PiB. The maximum capacity of an Extreme NAS file system is 256 TiB.
  • A General-purpose NAS file system can contain a maximum of 1 billion files. An Extreme NAS file system can contain a maximum of 0.5 billion files.

For more information, see Limits.

Why is the "insufficient inventory" error returned when I create a file system?

The error is returned because no storage resources are available in the selected zone. We recommend that you create a file system in another zone.

What is a mount target? What are the features of a mount target?

A mount target is an endpoint that compute nodes can use to access a NAS file system. The compute nodes can be Elastic Compute Service (ECS) instances, Elastic High Performance Computing (E-HPC) clusters, or Container Service for Kubernetes (ACK) clusters. When you create a mount target for a file system, you must select a network and a permission group. To access the file system by using the mount target, a compute node must reside in the selected network and meet the rules that are specified in the permission group. Multiple compute nodes can simultaneously use a mount target to access a NAS file system.

Can I change the network type of a mount target?

After you create a mount target for a file system, you cannot change the network type of the mount target. However, you can create a mount target of another network type and use the new mount target to remount the file system.
Note You can create a maximum of two mount targets for a General-purpose NAS file system. You can create only one mount target for an Extreme file system and the network type of the mount target must be Virtual Private Cloud (VPC).
For example, you have created a Capacity NAS file system and mounted the file system by using a mount target in the classic network. If you want to replace the mount target with a mount target in a VPC, perform the following steps:
  1. Create a mount target in a VPC. For more information, see Create a mount target.
  2. Unmount the file system that was mounted by using the mount target in the classic network. For more information, see Unmount file systems.

    Log on to the NAS console. On the Mount Targets tab of the details page for the file system, click Client List in the Actions column. Make sure that no IP address is displayed in the Client List dialog box.

  3. Mount the file system on the same destination path by using the mount target in the VPC. For more information, see Usage notes.
  4. On the Mount Targets tab, find the mount target in the classic network and click Disable in the Actions column.
  5. Before you delete the mount target, make sure that your business is not affected when the mount target is disabled. Then, click Delete to delete the mount target in the classic network.

How can I delete a mount target that is created by using other Alibaba Cloud services?

Delete a mount target that is created by using Cloud Shell

If you use Cloud Shell to manage NAS resources, a mount target is automatically created. The following figure shows an example.18

To delete the mount target that is created by using Cloud Shell, perform the following steps:

  1. Log on to Cloud Shell.
  2. In the top navigation bar, choose 1 > Unmount File Storage.
  3. In the Unmount Storage Space dialog box, confirm the ID of the file system that you want to unmount.
    • If the mount target is created by using the current RAM user, select Current User and click Unmount Now.
    • If the mount target is created by using another RAM user, select RAM User, select the RAM user from the drop-down list, and then click Unmount Now.

Delete a mount target that is created by using Hybrid Backup Recovery (HBR)

If you use HBR to manage NAS resources, a mount target is automatically created. The following figure shows an example.19

To delete the mount target that is created by using HBR, perform the following steps:

  1. Log on to the NAS console.
  2. In the left-side navigation pane, click File Backup.
  3. On the File Backup page, click Manage Mounts.
  4. In the Manage Mounts panel, find the file system and click Unmount in the Actions column.
  5. In the message that appears, click OK to delete the mount target that is created by using HBR.

How can I view a list of clients on which a file system is mounted?

Note You can view a list of clients on which a General-purpose NAS file system is mounted. You cannot view a list of clients on which an Extreme NAS file system is mounted.
  1. Log on to the NAS console.
  2. In the left-side navigation pane, choose File System > File System List.
  3. On the File System List page, find the file system and click the name of the file system.
  4. On the details page of the file system, click the Mount Targets tab.
  5. Find the mount target and click Client List in the Actions column.
    In the Client List dialog box, view the IP addresses of the clients on which the file system is mounted.
    Note The list includes only the clients that have accessed the file system within the last minute.

Is the permission group associated with a file system deleted when I delete the file system?

When you delete a file system, the permission group associated with the file system and the rules created in the permission group are not deleted, whereas the mount target is deleted. For information about how to delete a permission group, see Manage a permission group.
Important After a file system is deleted, the data on the file system cannot be restored. Proceed with caution.

Can NAS files be restored after they are deleted by mistake?

No, NAS files cannot be restored after they are deleted by mistake.

To retrieve accidentally deleted data in a timely manner, we recommend that you enable the snapshot, recycle bin, or file backup feature. For more information, see Manage snapshots, Back up and restore files, and Recycle bin.

Why am I unable to delete files in an SMB file system after the file system is mounted?

The IP address that you use may be denied access to the file system or your account does not have the required permissions. Check whether the permission group allows read and write access from your IP address and whether you use an administrator account to log on to the NAS console.

Why am I unable to create classic network mount targets?

On and after November 21, 2022, classic network mount targets cannot be created for General-purpose NAS file systems. However, classic network mount targets created before November 21, 2022 can still be used to access file systems.