Carel, I am running only one instance on both Primary and Standby side. Anything else yiu can think of? Thanks for your response. Sami On 9/5/05, Carel-Jan Engel <cjpengel.dbalert@xxxxxxxxx> wrote: > > Sami > > I guess this is still the RAC HA sandbox system you're using for your POC? > > Did you shutdown all but one instance at both ends? During switchover only > one instance per database is allowed to run. > >