# No Failover Minor version upgrades will always trigger downtime for Primary and Replica servers There's no failover. They can't do the following: 1. Failover A to B 2. Upgrade A 3. Sync B to A 4. Failover B to A 5. Upgrade B Ideally they could, but version differences can cause issues, so they don't allow it. This means that downtime *will* occur.