samba permanently mount

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http://www.linuxquestions.org – Dear all for mount a directory in CentOS to windows server shared folder, i wrote "// /backup/share/ cifs username=root,password=ROOTPASSWORD 0 0" in /etc/fstab. when linux restart, mount command does not work but when i use command mount -a, every things OK and i can use mount drive. Please Help me. (HowTos)