to mount or not to mount

[vu pham]

I have this line in /etc/fstab:
192.168.253.13:/home/mobileits /home/mobileits  nfs     noauto,user  0 0

and I can manually mount it and access it. After using it for a while, I 
  unmount it and it does not report any error and mount command does not 
show it in the mount list any more. umount it the second time gets an 
error that it is not currently mounted

But in fact, I still be about to access that remote directory and its 
files and /proc/mounts does show it is still mounted.

[vu at ef proc]$ more mounts
rootfs / rootfs rw 0 0
/dev/root / ext3 rw,relatime,user_xattr,acl,data=ordered 0 0
/dev /dev tmpfs rw,relatime 0 0
/proc /proc proc rw,relatime 0 0
/sys /sys sysfs rw,relatime 0 0
/proc/bus/usb /proc/bus/usb usbfs rw,relatime 0 0
devpts /dev/pts devpts rw,relatime 0 0
/dev/sda6 /home ext3 rw,relatime,user_xattr,acl,data=ordered 0 0
/dev/sda1 /boot ext3 rw,relatime,user_xattr,acl,data=ordered 0 0
tmpfs /dev/shm tmpfs rw,relatime 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
192.168.253.13:/home/mobileits /home/mobileits nfs 
rw,relatime,vers=3,rsize=32768,wsize=32768,hard,nointr,proto=tcp,timeo=600,retrans=2,sec=sys,addr=192.168.253.13 
0 0



Any idea why ? Thanks.

This is a FC8 system.
Linux ef.sivell.com 2.6.24.4-64.fc8PAE #1 SMP Sat Mar 29 09:42:24 EDT 
2008 i686 i686 i386 GNU/Linux

Vu