see explanation below.
Explanation
1. vi /etc/auto.master
/mnt /etc /auto.misc --timeout=50
* vi /etc/auto.misc
* data -rw,soft,intr server1.example.com:/data
* service autofs restart
* chkconfig autofs on
When you mount the other filesystem, you should unmount the mounted filesystem, Automount feature of linux helps to mount at access time and after certain seconds, when user unaccess the mounted directory, automatically unmount the filesystem.
/etc/auto.master is the master configuration file for autofs service. When you start the service, it reads the mount point as defined in /etc/auto.master.