Incremental Resynchronization

Focusing on efficiency and optimization, Incremental Resynchronization streamlines the synchronization process by transmitting only the incremental changes since the last sync, rather than the entire data set. By reducing the data load and focusing on differential changes, Incremental Resynchronization offers a pragmatic solution for keeping replicated systems up-to-date without overburdening network resources.

We apply the concept of Incremental Resynchronization in various forms, adapting to different replication needs and network environments. This includes Metro Global Mirror Incremental Resynchronization for Metro Global Mirror environments, Multi-target Incremental Resynchronization (MTIR) for multi-target Peer-to-Peer Remote Copy (PPRC) relationships, and Cascaded Incremental Resynchronization (CIR) for cascaded PPRC systems. Each variant addresses specific requirements of different data replication scenarios, ensuring efficient and timely data synchronization.

Incremental Resynchronization flavors

Multi-Target Incremental Resynchronization (MTIR)
This function provides an Incremental Resynchronization capability for any multi-target PPRC relationships. It introduces a new Multi-target Incremental Resync (MTIR) relationship type which is created automatically on the secondary volumes when the primary is in a multi-target PPRC relationship.
For more information, see Multi-Target Incremental Resynchronization (MTIR).

Metro Global Mirror Incremental Resynchronization
This functionality provides an Incremental Resynchronization capability for Metro Global Mirror environments. MGM Incremental Resync is a characteristic of an existing PPRC relationship and is established using an option on the establish command for this relationship.
For more information, see Metro Global Mirror Incremental Resynchronization.

Cascaded Incremental Resynchronization (CIR)
This new function, available on release 9.4.0 and above, provides an Incremental Resynchronization capability for any cascaded PPRC relationship. It builds on the capabilities introduced with multi-target PPRC and introduces a new Cascaded Incremental Resync relationship type which is similar to the Multi-target Incremental Resync relationship type. When a Cascaded Incremental Resynchronization is performed using a PPRC failback other existing relationships on the volume are maintained enabling these to be resynchronized at a later point in time.
For more information, see Cascaded Incremental Resynchronization.