Fault response models for data replication spanning different methodologies

An apparatus comprising:

• a memory;
• and
• a processing device, operatively coupled to the memory, the processing device configured to:
• determine that one or more storage systems, of a plurality of storage systems that uses a first fault response model, are experiencing a change in availability of a first mediation service used in the first fault response model that is external to the plurality of storage systems;
• and
• based on the determination, communicate a different fault response model among the plurality of storage systems, wherein use of the different fault response model involves responding to faults using one or more methods that include a mediation service that is different from the first mediation service as well as at least one method that is not based on use of mediation services.