Like DNS cache in Active directory, the same method we can use in Apple open directory using mobile account method.
Using the mobile account policy we can access the domain without network connection. The steps are done in MAC Lion OS server.
1 ) Open the work group manager in server admin tool and select the user group
2) Select preferences and it list the available options
3) There select Mobility
4) There click the option as below picture
If you have NFS mounted network home directory then select the first option in create home setting.
So the mobile user creation prompt come on first login time.