Which remote replication solution has the highest bandwidth requirements?

A.
Array-based synchronous

B.
Array-based disk buffered

C.
Host-based asynchronous LVM mirroring

D.
Log shipping over IP networks

Explanation:

Synchronous Replication
Application response time is increased with synchronous remote replication because writes must
be committed on both the source and target before sending the “write complete” acknowledgment
to the host. The degree of impact on response time depends primarily on the distance between
sites, bandwidth and quality of service (QOS) of, the network connectivity infrastructure. 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 extensions in response time. Typically,
it is deployed for distances less than 200 KM (125 miles) between the two sites.