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 20 Extreme NAS file systems in a region.
  • A NAS Capacity file system has a maximum capacity of 10 PiB, whereas a NAS Performance file system has a maximum capacity of 1 PiB.
  • A file system can contain a maximum of 1 billion files.

For more information, see Limits of product specifications.

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, assume that a NAS Capacity file system is created and mounted 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 is 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 Mounting Use tab of the details page for the file system, click Client mounted. Make sure that the Client mounted list of the mount target in the classic network is empty.

  3. Mount the file system on the same destination path by using the mount target in the VPC. For more information, see Precautions.
  4. On the details page of the file system, find the mount target in the classic network and click Disable in the Operations 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 > Unbind Storage Space.
    3. In the Unbind Storage Space dialog box, specify the ID of the file system that you want to unbind.
      • If the mount target is created by using the current RAM user, select Current User and click Unbind.
      • If the mount target is created by using another RAM user, select RAM User and click Unbind.
  • Delete a mount target that is created by using the backup service
    If you use the backup service 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 the backup service, 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 dialog box that appears, click OK to delete the mount target that is created by using the backup service.

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

Note General-purpose NAS allows you to view a list of clients on which a file system is mounted. Extreme NAS does not support this operation.
  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 Mounting Use.
  5. Find the mount target and click Client mounted in the Operations column.
    In the Client mounted dialog box, view the IP addresses of the clients on which the file system is mounted.
    Note The list includes only the clients that accessed the file system within the last minute.