This topic provides answers to some commonly asked questions about the basic management features of Apsara File Storage NAS.

What are the limits of NAS file systems?

  • You can use an Alibaba Cloud account to create a maximum of 20 file systems in a region.
  • The maximum capacity of a NAS Performance file system is 10 PB. The maximum capacity of a NAS Capacity file system is 1 PB.
  • A file system can contain a maximum of 1 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 file system is available for purchase in the selected zone. The number of available file systems varies depending on the zone. We recommend that you create a file system in another zone.

What is 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 clusters. When you create a mount target for a file system, you must select a network and 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. A mount target can be simultaneously accessed by multiple compute nodes.

Can I change the network type of a mount target?

You cannot change the network type of a mount target after the mount target is created. However, you can create a mount target and remount the file system by using the new mount target.
Note You can create a maximum of two mount targets for a General-purpose file system. However, 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, a NAS Capacity file system is created and mounted by using a mount target of the classic network type. If you want to replace the mount target with a mount target of the VPC type, 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 a file system.
  3. Use the mount target in the VPC to mount the file system on the same destination path. For more information about how to mount a file system, see Precautions.
  4. Log on to the NAS console, make sure that the Client mounted list of the original mount target is empty.

    To view the list, go to the details page of the file system. In the left-side navigation pane, click Mounting Use. In the Mount Target section, find the original mount target and click Client mounted in the Operations column.

  5. Disable the mount target in the classic network.
  6. Delete the mount target in the classic network after you make sure that your business is not affected.

How can I view a list of clients on which a 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. Find the file system and click Management in the Actions column.
  4. In the left-side navigation pane, choose Mounting Use > Mount Target. On the page that appears, click Client mounted in the Operations column to view the list of clients on which the file system is mounted. The list includes the IP address of each client.
    Note The list includes only the clients that access the file system within the last minute.