Lastly, if all above options and methods failed for you, you may try the final method reboot or SysRq or hardware resetting to reboot you Linux. Then you can continue to umount the filesystem. mnt/data) by # fuser /mnt/dataįuser can also help you kill all processes using a filesystem at the same time by # fuser -k /mnt/data You can find out the processes using a filesystem (e.g. After the processes are killed, the filesystem will be able to be unmounted. If you are sure that it is safe to kill the process, you may kill them by kill or kill -9. It will output lines like bash 17622 user1 cwd DIR 253,2 4096 2 /mnt/data Here, we use the mount point /mnt/data as an example. You need to run the following command as root. The following command finds out the processes accessing the partition/filesystem. Here, we introduce 2 common methods with 2 common tools. umount /backup umount: /backup: target is busy. To remove the file system, use the mount point name or device name following the umount command. You don’t need to use any arguments to unmount (remove) the file system. If the reason is that processes are using the filesystem, we can kill the processes using the filesystem and then it will be fine to unmount it. If so, you should kill the process to unmount the filesystem. Option 2: Kill the processes using the filesystem and then unmount it Please be aware that programs may not expect a force or lazy unmounting and these options may disrupt running processes using the filesystem, cause data loss or corrupt files opened. The -f option is for unreachable NFS system. We just provide the filesystem name or the mount point following the umount command. f, -forceįorce an unmount (in case of an unreachable NFS system). The umount command notifies the system to detach the given mounted filesystems. There are options of umount to detach a busy device immediately even if the device is busy. If the remounting can succeed, it avoids the problems of disrupting or killing processes. ![]() The “-o remount” option will make Linux try to remount the filesystem. Without using sudo, the system reports messages like 'Device or resource busy' or 'Transport endpoint is not connected', even if permissions are correct. For these situations, you may first try # mount -o remount /your/mount/point This answer refers to Ubuntu 20.04, but in general you need two steps to properly unmount a sshfs volume: i) kill the sshfs process and ii) use sudo to unmount. It is common that the reason we want to unmount a filesystem is that we find that there are problems with the mounting temporarily and we want to unmount and re-mount it. Here this option is not to really do unmounting a filesystem. ![]() Option 2: Kill the processes using the filesystem and then unmount it.Option 0: Try to remount the filesystem if what you want is remounting.
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