Described are techniques used in performing data replication processing.
Data is replicated on a recovery site from a production site. When a
disaster occurs, the state of the replication processing is determined
and a restart copy of the data is made available from the recover site.
Processing continues based on whether protection mode is desired such
that the system executes using the recovery site as the restart with a
replicated copy of the data. Data is propagated from the recovery site to
the production site to resume operations and replication processing
originating from the production site.