In certain types of disaster incidents, the primary site (including both service and compute clusters) may become temporarily or even permanently unusable. In this case, JetStream DR can be used to recover the affected domains to a separate recovery site. 

Failover can be performed “as-needed,” in which case resources at the recovery site will only be created and utilized at the time failover recovery is performed. This is the most economical mode of operation. 

Alternatively, failover can be performed “continuously” where the recovery site is initially created and then synchronized with the protected site during its normal course of operation. Continuous failover (“CFO”) requires simultaneous operation of resources at both the protected site as well as the recovery site, but it can significantly reduce the amount of time required to recover from a disaster event.