Amazon FSx for Lustre
Lustre User Guide

Unmounting File Systems

Before you delete a file system, we recommend that you unmount it from every Amazon EC2 instance that it's connected to. You can unmount a file system on your Amazon EC2 instance by running the umount command on the instance itself. You can't unmount an Amazon FSx for Lustre file system through the AWS CLI, the AWS Management Console, or through any of the AWS SDKs. To unmount an Amazon FSx for Lustre file system connected to an Amazon EC2 instance running Linux, use the umount command as follows:

umount /mnt/fsx

We recommend that you do not specify any other umount options. Avoid setting any other umount options that are different from the defaults.

You can verify that your Amazon FSx for Lustre file system has been unmounted by running the df command. This command displays the disk usage statistics for the file systems currently mounted on your Linux-based Amazon EC2 instance. If the Amazon FSx for Lustre file system that you want to unmount isn’t listed in the df command output, this means that the file system is unmounted.

Example – Identify the Mount Status of an Amazon FSx for Lustre File System and Unmount It

$ df -T Filesystem Type 1K-blocks Used Available Use% Mounted on file-system-id.fsx.aws-region.amazonaws.com@tcp:/fsx /mnt/fsx 3547708416 61440 3547622400 1% /mnt/fsx
$ umount /mnt/fsx
$ df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on /dev/sda1 ext4 8123812 1138920 6884644 15% /