After enabling quotas, the second step should be remounting file system Issue the mount -o remount <file-system> command (where <file-system> is the name of the file system) to remount the file system. For example, to remount the /home file system, the command to issue is mount -o remount /home. https://access.redhat.com/documentation/en- us/red_hat_enterprise_linux/5/html/deployment_guide/ch-disk-quotas