Unmount an SMB file system on Windows - File Storage NAS

This topic describes how to use commands to unmount a file system from a client.

Prerequisites

A File Storage NAS (NAS) file system is created. For more information, see Create a file system.
A mount target is created. For more information, see Manage mount targets.
The file system is mounted on the client from which you plan to unmount it. For more information, see Scenarios.

Unmount from a Linux ECS instance

Log on to the Elastic Compute Service (ECS) console.
Connect to the ECS instance from a remote host.
Run the umount /mnt command to unmount a Network File System (NFS) file system. Replace the /mnt directory with the actual mount directory.
Note
Do not specify other parameters in the umount command unless necessary.
If the error message device is busy is returned, it means a process is still accessing the file system. Follow these steps to identify and terminate the process:
- Install fuser.
  - For an ECS instance that runs CentOS, Red Hat Enterprise Linux (RHEL), or Alibaba Cloud Linux, fuser is preinstalled.
  - For an ECS instance that runs Ubuntu or Debian, run the apt install -y fuser command to install fuser.
- Run the fuser -mv <Local directory of the mount target> command to view the ID of the process that is accessing the NAS file system.
- Run the kill <pid> command to terminate the process.
  Note
  Do not attempt to kill kernel processes.
  If the file system still cannot be unmounted after the process is terminated, run the umount -f <Mount directory> or umount -l <Mount directory> command to forcibly unmount the file system. Force unmounting can cause data loss or corruption. Use it only as a last resort.
Optional. Disable automatic mounting.
If an automatic mount entry for this file system exists in /etc/fstab, remove or comment out the corresponding line to prevent it from being mounted again on system startup.
To verify that the file system has been unmounted, run the mount -l command.
The file system is successfully unmounted if it is no longer listed in the output.

Unmount from a Windows ECS instance

Log on to the ECS console.
Open the Command Prompt and run the following command to unmount the file system:
```
net use D: /delete
```
Replace the drive letter D: in the preceding command with the actual drive letter. Run the net use command to obtain the drive letter of a mount target.
Note
The net use * /delete command will prompt you to confirm the unmounting of each mapped drive one by one.
The net use * /delete /y command unmounts all mapped drives without confirmation.
Optional. Disable automatic mounting.
If an automatic mount entry for this file system exists in /etc/fstab, remove or comment out the corresponding line to prevent it from being mounted again on system startup.
- Automatic mount script for an SMB file system: auto_mount.bat
- Automatic mount script for an NFS file system: nas_auto.bat
Run the net use command to view the unmount result.
If the SMB file system is not displayed in the command output, the file system is unmounted.