Rick Stevens wrote:
Unplugging the device and having udev unmount it can cause issues as you can't necessarily do a "umount" if the device (filesystem) is busy. Even "umount -f" only works on NFS volumes most of the time--not always. This is why you generally don't have easily-removable items in a server farm (it says here in small print).
Not sure, but I believe that -f behaves much like -l, and as long as something is in use, like a process with a file open or cd into the mount. As long as the process doesn't try to use the mount, other than what's n cache, it goes on happily, and only when no process knows, or thinks it knows, about the umounted f/s it won't truly go away.
In either case, the name of the big hammer is lsof, assuming you really want to umount and are willing to accept collateral damage.
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