Multiple locations

What changes in the plan when the cluster is to be in more than one place. A cluster spread over sites is divided into locations. Each page in this section covers one question that the split raises before any hardware is bought.

When locations help and when they do not covers the decision itself. The WAN cost of writes covers what the link between sites has to carry and what crossing that link costs every write. Quorum across sites covers which site keeps the Leader when the link between the sites breaks.