Procedure to mount and unmount NFS filesystems on AIX

1)  Show what is being exported on the source server

     showmount -e

    Note:  If the command above does not show the correct mount points
    that needs to be exported.  You can run the following command to attempt
    to export the filesystems.

     exportfs -a

2)  To unmount the filesystem on the source server that is being NFS on other systems.

     a)  unmount the NFS mount points on the target server.

          umount (filesystems)   target servers
         
     b)  umount the filesystem on the source server once the target servers
         are unmounted.

           umount (filesystems)
          
3)  Mounting NFS mount points on target server.

     a) mount (IP):(mount point)  (mount point)