importing data dump in the databases of new Linux server

ORA-27054: NFS file system where the file is created or resides is not mounted with correct options

I have a mount point
"dlimpuclus24:iims-home-local
287G 276G 12G 97% /iims-home" which is giving the issue. But mount point is accessable.
mount -a didn't work says device busy.
Following command didn't work too.
umount -f /iims-home
fuser -km /iims-home

some blogs suggest to use options like

1 "
mount -o rw,bg,hard,nointr,tcp,vers=3,timeo=300,rsize=32768,wsize=32768,actimeo=0 -t nfs oraclenerd:/media/data_2/files/oradata/TESTING /media/test" or

2 '"mount -o rw,rsize=32768,wsize=32768,hard,nointr,bg,nfsvers=3,tcp,actimeo=0, timeo=600 saf01-nfs:/vol/lnxprj/dbexp /dbexp"

This is RHEL 5.7 (Tikanga)

lsb_release -a
LSB Version: :core-4.0-amd64:core-4.0-ia32:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-ia32:graphics-4.0-noarchrinting-4.0-amd64rinting-4.0-ia32rinting-4.0-noarch
Distributor ID: RedHatEnterpriseServer
Description: Red Hat Enterprise Linux Server release 5.7 (Tikanga)
Release: 5.7
Codename: Tikanga

any suggestion on this please?

I work as Unix admin heare but have very limited knowledge on oracle db

Mount Options for Oracle over NFS. It's All About the Port may help.