A paired virtual business service must not be online at the same time on the production site and on the DR site. The GNOFAIL alert is used to prevent concurrency violation. Concurrency violation at virtual business service level is prevented by the VBS daemon if all service groups are global. But in case some service groups are non-global, you must ensure that all groups in the virtual business service at the production are offline or faulted before you start the virtual business service at the DR site.