When upgrading GEO partners, it is strongly recommended that all nodes are upgraded simultaneously. Because GEO partners operate in active-active mode, upgrading at the same time ensures that consistent behavior is experienced across all nodes.

If you must operate a GEO cluster with mixed versions, be sure to make all changes from the most recent version. This prevents configuration loss due to incompatible configurations. Additionally, changing configuration options not present in older versions results in disparate behavior.