how to use config restore on 7mod

Hi

I want to make a test for restoring a configuration after a DR on 7-MOD

For my test 

i create a new vol and qtree with NFS exports

i make a backup with config dump <conf_file>

i delete the vol

I try to restore the conf with config restore <conf_file>

Nothing happens  ( my vol is not beeing appears)

i make a takeover/giveback

Nothing has changed , my vol is not  beeing appears

Somebody can help me ?