Methods and systems to improve input/output (I/O) resumption time by batching multiple non-conflicting operations during a non-disruptive automatic unplanned failover from a primary copy of data at a primary storage system to a mirror copy of the data at a cross-site secondary storage system

A multi-site distributed storage system having a primary storage site with a first cluster having a first set of consistency groups (CGs) initially with a leader role and a secondary storage site with a second cluster having a second mirrored set of CGs initially with a follower role comprising:

• a processing resource;
• and
• a non-transitory computer-readable medium coupled to the processing resource, having stored therein instructions, which when executed by the processing resource cause the processing resource to:
• determine whether heartbeat information from one or more storage objects of a CG of the first set of CGs is received during a time period;
• determine an out of sync (OOS) state for a data replication relationship between the CG of the first set of CGs and a mirrored CG of the second set of CGs when the heartbeat information is not received during the time period;
• and
• send a single bulk role change call with a cluster identifier from the second cluster to an external mediator to provide a role change from follower to leader in the second set of CGs based on the OOS state for the CG of the first set of CGs.

A non-transitory computer-readable storage medium embodying a set of instructions, which when executed by a processing resource of a multi-site distributed storage system cause the processing resource to:

• determine whether heartbeat information from each storage object of a consistency group (CG) of a first set of CGs of a first storage cluster of the multi-site distribution storage system is received with a second storage cluster during a time period;
• determine an out of sync (OOS) state for a data replication relationship between the CG of the first set of CGs and a mirrored CG of a second set of CGs of the second storage cluster of the multi-site distribution storage system when the heartbeat information of at least one storage object of the CG of the first set of CGs is not received with the second storage cluster during the time period;
• and
• starting an automatic unplanned failover (AUFO) with a single execution context for each CG of the second set of CGs.