In synchronous remote replication, why is it recommended that the distance between the two sites should be less than 200 KM?
A. Receive acceptable response time
B. Maintain consistency among replicas
C. Maintain consistency among replicas
D. Increase the size of the buffer
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Application response time is increased with synchronous remote replication because writes must
be committed on both the source and the target before sending the “write complete”
acknowledgment to the compute system. The degree of impact on response time depends
primarily on the distance and the network bandwidth between sites. If the bandwidth provided for
synchronous remote replication is less than the maximum write workload, there will be times
during the day when the response time might be excessively elongated, causing applications to
time out. The distances over which synchronous replication can be deployed depend on the
application’s capability to tolerate the extensions in response time. Typically synchronous remote
replication is deployed for distances less than 200 kilometers (125 miles) between the two sites.