umount: This utility only unmounts cifs filesystems

Can’t umount Red-Hat filesystem with error “This utility only unmounts cifs filesystems” either with force?

[@Linux-redhat5 ~]$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.11 (Tikanga)

ERROR:

[@Linux-redhat5 /]# umount /cifsfilesystem/data/custom
This utility only unmounts cifs filesystems.
This utility only unmounts cifs filesystems.
This utility only unmounts cifs filesystems.

#EITHER no dismount with FORCE (-f):

[@Linux-redhat5 /]# umount.cifs -f /cifsfilesystem/data/custom
This utility only unmounts cifs filesystems.

SO TRY THIS:

[@Linux-redhat5 /]# umount -i /cifsfilesystem/data/custom
umount: //cifsfilesystem/data/custom: not found
umount: /cifsfilesystem/data/custom: not mounted
umount: //cifsfilesystem/data/custom: not found
umount: /cifsfilesystem/data/custom: not mounted
umount: //cifsfilesystem/data/custom: not found
umount: /cifsfilesystem/data/custom: not mounted

[@Linux-redhat5 /]# df -h /cifsfilesystem/data/custom
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vgroot-lvroot
5.9G 4.5G 1.1G 81% /

IDEA:
-i
Don’t call the /sbin/umount. helper even if it exists. By default /sbin/umount. helper is called if one exists.

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