I have a requirement that has two sites that are geographically separated. The sites are networked together using a high availability dual (redundant) link. Each site needs to have continuous access to a shared SQL Server database. I need to create a system that will recover if the inter-site link somehow fails - both sites should ideally be able to continue to work using a local copy of the database and then resync all changes once the inter-site link is restored.
How would this situation best be accomodated please. (I have explored information about mirroring and clusters and it seems neither quite satisfy my requirement, although it has to be said that I am a novice in this area). Is there any merit in having 2 servers at each site (so 2 + 2) in order to provide further availability at each site?
Many thanks.