A long-standing, popular alternative technique to achieve long-distance, remote replication is known as asynchronous data replication. Asynchronous data replication's advantage unobtrusively provides long-distance, remote data replication, thereby preserving application performance as it provides disaster recovery data protection. One asynchronous data replication factor of particular importance is the often-overlooked asynchronous replication buffer where data waits at a primary site pending replication to a secondary remote location. While the concept of a replication buffer is common to all asynchronous or periodic replication technologies, the mechanism for achieving such is not. How a solution handles the asynchronous replication buffer has significant ramifications on a number of critical DR measures. This paper presents the benefits of a logical volume-based asynchronous replication buffer in the context of performance, reliability, recovery objectives and cost.
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