Chapter 19
Reliability and Near-Continuous Data Protection, Asynchronous Replication
Asynchronous replication establishes a remote mirror from one location (primary storage) to another (target or redundant system). Any time the primary system encounters a write, the replication kicks in and writes that same data to another system (e.g., the target or redundant system). The subtlety is that asynchronous replication allows the primary write operation to complete, and then allows the write to the target or redundant system a little later.
Asynchronous replication is ideal for applications such as medical records, where a sum-one-minute delay is acceptable. The typical failure mode is one server going down due to planned service, or operating ...
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