Storage system with multiple write journals supporting synchronous replication failure recovery

A method comprising:

• configuring a storage system to participate as a source storage system in a synchronous replication process with a target storage system;
• and
• in conjunction with the synchronous replication process, the source storage system:
• receiving write requests from at least one host device;
• for each of the received write requests:
• responsive to the write request being a multi-page write request, creating a corresponding entry in a first journal for the write request, where the first journal is utilized to ensure that the given write request is completed for all of the multiple pages or for none of the multiple pages;
• responsive to the write request being a single-page write request, creating a corresponding entry in a second journal different than the first journal;
• updating an address-to-signature table utilizing write data of the write request;
• if the corresponding entry for the write request was created in the first journal, swapping the entry from the first journal into the second journal;
• and
• sending the write data of the write request to the target storage system;
• wherein responsive to a failure in the synchronous replication process, different sets of one or more recovery operations are performed based at least in part on whether or not there is at least one entry remaining in the first journal;
• and
• wherein the method is implemented by at least one processing device comprising a processor coupled to a memory.

A computer program product comprising a non-transitory processor-readable storage medium having stored therein program code of one or more software programs, wherein the program code when executed by at least one processing device causes said at least one processing device:

• to configure a storage system to participate as a source storage system in a synchronous replication process with a target storage system;
• and
• in conjunction with the synchronous replication process, to configure the source storage system:
• to receive write requests from at least one host device;
• for each of the received write requests:
• responsive to the write request being a multi-page write request, to create a corresponding entry in a first journal for the write request, where the first journal is utilized to ensure that the given write request is completed for all of the multiple pages or for none of the multiple pages;
• responsive to the write request being a single-page write request, to create a corresponding entry in a second journal different than the first journal;
• to update an address-to-signature table utilizing write data of the write request;
• if the corresponding entry for the write request was created in the first journal, to swap the entry from the first journal into the second journal;
• and
• to send the write data of the write request to the target storage system;
• wherein responsive to a failure in the synchronous replication process, different sets of one or more recovery operations are performed based at least in part on whether or not there is at least one entry remaining in the first journal.