It is generally not recommended to run fsck or e2fsck on a mounted file system, as doing so can cause data corruption or other issues.
fsck and e2fsck are utilities that are used to check and repair errors on a file system. They work by scanning the file system and identifying any problems, such as missing or damaged files, and then attempting to fix them. However, if the file system is mounted and being used by the operating system, fsck and e2fsck may not be able to repair the errors correctly, as they may not have access to all of the necessary data.
If you need to run fsck or e2fsck on a file system, it is generally best to do so when the file system is not mounted, such as during the boot process. On most systems, fsck or e2fsck will be run automatically when the system is booted if it detects any errors on the file system.
If you need to run fsck or e2fsck on a mounted file system, it is recommended to use the -n option to run the utility in "dry run" mode. This will cause fsck or e2fsck to scan the file system and identify any problems, but it will not attempt to repair them. This can be useful for diagnosing problems with the file system, but it is still not recommended to use the utility to actually repair any errors on a mounted file system.
For more information on using fsck and e2fsck, you can consult the documentation or seek guidance from the Linux community.