13.1.2. Remounting the File Systems
After adding the usrquota and/or grpquota options, remount each file system whose fstab entry has been modified. If the file system is not in use by any process, use one of the following methods:
Issue the umount command followed by the mount command to remount the file system.
Issue the mount -o remount /home command to remount the file system.
If the file system is currently in use, the easiest method for remounting the file system is to reboot the system.