A replication method where two storage systems are replicated asynchronously. This has the advantage of being able to process writes much faster at the primary location, because the system does not have to wait for data to be saved at the replication site. This is usually implemented using snapshots; a snapshot of the current state of the master system is replicated to the secondary storage system. Depending on the configuration used, the process will be repeated as soon as the snapshot is replicated, or it will be triggered at certain times.
The main advantage of this technique is that is allows for replication over far larger distances, because the link between the storage systems can have a lower bandwidth (not every write has to be replicated; only the state of the system at certain points in time) and higher latency (because writes don’t need to be confirmed at both sites at once). The obvious disadvantage is that in case of a failure on the primary system, data loss is guaranteed. The secondary system will always be missing data that has been written to the master. To prevent that, synchronous replication needs to be used.
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