Data center failover is an expensive, complex, and sometimes fragile component of a network design. Solving this one problem usually involves almost every other team in the IT department, and it’s inexorably linked with the very day-to-day operation of an organization.
How will a business recover from a data center outage?
How can mission critical applications move seamlessly between data centers?
How will our end-users reach an application in the event of a failover?
These are just a few high level questions that, along with very technical and legal requirements, will guide the actual design of a data center failover plan. The answers will determine bandwidth, routing protocols, storage, virtual environments, security, hardware platforms, and every minutia of design right down to how DNS will be propagated and what OSPF metrics are set to.