Platform & DevOps·Running it: capacity, failure and recovery
the original site came back and moving home turned out to be harder than the failover was, because the standby now holds the newer data.
Failback
Also calledfail back, return to primary
Returning to the primary after a failover, which requires reconciling whatever the secondary accepted while the primary was away. It is the half of disaster recovery that is routinely undocumented, and it is usually the riskier half, because it is planned rather than forced and everyone is tired. Many teams deliberately do not fail back, and simply treat the secondary as the new primary until the next event.