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Dell Technologies recommends including a Flash tier in a hybrid pool where asynchronous replication will be active. This is applicable to both the source and the destination pools.
Dell Technologies recommends configuring multiple replication interfaces per SP and distributing replication sessions across them. LACP can also be used to aggregate bandwidth for a replication interface. Configure Jumbo frames (MTU 9000) when possible.
Asynchronous replication takes snapshots on the replicated storage objects in order to create the point-in-time copy, determine the changed data to transfer, and maintain consistency during the transfer. Consider the overhead of snapshots when planning performance and capacity requirements for a storage pool which will have replicated objects.
When possible, fill the source storage object with data before creating the replication session. The data will then be transmitted to the destination storage object during initial synchronization. This is typically the fastest way to populate the destination storage object with asynchronous replication.
Setting smaller RPO values on replication sessions will not make them transfer data more quickly; but smaller RPOs will result in more frequent snapshot operations. Choosing larger RPOs, or manually synchronizing during non-production hours, may provide more predictable levels of performance.