Storage system with efficient snapshot pair creation during synchronous replication of logical storage volumes

A method comprising:

• in conjunction with synchronous replication of at least one logical storage volume between first and second storage systems:
• to create a first snapshot of the logical storage volume in the first storage system;
• to create a second snapshot of the logical storage volume in the second storage system;
• to create a third snapshot of the logical storage volume in the first storage system;
• to initiate an asynchronous replication cycle to transfer differential data between the first and the third snapshots in the first storage system to the second storage system;
• and
• to utilize the second snapshot and the transferred differential data to create an additional snapshot of the logical storage volume in the second storage system that is synchronized with the third snapshot in the first storage system;
• wherein the first and second storage systems are arranged in an active-active configuration and the synchronous replication comprises synchronous replication of each of a first plurality of write operations from the first storage system to the second storage system and synchronous replication of each of a second plurality of write operations from the second storage system to the first storage system;
• wherein the method further comprises:
• marking in-flight input-output operations in the first storage system at the time of creation of the first snapshot;
• and
• creating the second snapshot in the second storage system responsive to completion of the marked in-flight input-output operations in the first storage system;
• and
• wherein the method is performed 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, in conjunction with synchronous replication of at least one logical storage volume between first and second storage systems:

• to create a first snapshot of the logical storage volume in the first storage system;
• to create a second snapshot of the logical storage volume in the second storage system;
• to create a third snapshot of the logical storage volume in the first storage system;
• to initiate an asynchronous replication cycle to transfer differential data between the first and the third snapshots in the first storage system to the second storage system;
• and
• to utilize the second snapshot and the transferred differential data to create an additional snapshot of the logical storage volume in the second storage system that is synchronized with the third snapshot in the first storage system;
• wherein the first and second storage systems are arranged in an active-active configuration and the synchronous replication comprises synchronous replication of each of a first plurality of write operations from the first storage system to the second storage system and synchronous replication of each of a second plurality of write operations from the second storage system to the first storage system;
• and
• wherein the program code when executed by said at least one processing device further causes said at least one processing device:
• to mark in-flight input-output operations in the first storage system at the time of creation of the first snapshot;
• and
• to create the second snapshot in the second storage system responsive to completion of the marked in-flight input-output operations in the first storage system.