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APEX Block Storage enables native asynchronous journal-based replication, with a defined RPO. With async replication you are also replicating entire volumes or sets of volumes (Replication Consistency Groups).
This crash-consistent replication can be used to recover from a physical or logical disaster quickly and easily. Additional use cases can align with data migration, test data at a remote site, or to offload a volume backup.
This replication can also be from an existing PowerFlex on-premises deployment to APEX Block Storage for AWS.
The SDR is the APEX Block Storage component that enables asynchronous journal based replication. The SDR is located alongside the SDS on the same nodes. The same scalability as part of the storage topology also exists for native replication. Only I/Os of replicated volumes will flow through SDR. This is governed by the metadata cache that the MDM manages on the SDC and SDS. All IO traffic for replicated volumes goes through the SDR (both reads and writes).
The RPO is down to 15 seconds which reduces the data-loss to a minimal time in case of disaster recovery.
The SDR orchestrates the following functions:
At the source:
At the target: