Membership Control For Synchronously Replicating Storage Systems

A storage system comprising:

• a plurality of storage devices;
• and
• a storage system controller, operatively coupled to the plurality of storage devices, configured to:
• maintain a membership state that defines a synchronized set of storage systems of a plurality of storage systems configured to synchronously replicate a dataset;
• in response to detecting a membership event, transition the membership state to define an updated synchronized set of storage systems;
• and
• process input/output (I/O) operations for the dataset using the updated synchronized set of storage systems.

A non-transitory computer readable storage medium storing instructions which, when executed, cause a storage system controller to:

• maintain a membership state that defines a synchronized set of storage systems of a plurality of storage systems configured to synchronously replicate a dataset;
• in response to detecting a membership event, transition the membership state to define an updated synchronized set of storage systems;
• and
• process input/output (I/O) operations for the dataset using the updated synchronized set of storage systems.