E10-001 · Question #39
Which remote replication solution has the highest bandwidth requirements?
The correct answer is A. Array-based synchronous. 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…
Question
Which remote replication solution has the highest bandwidth requirements?
Options
- AArray-based synchronous
- BArray-based disk buffered
- CHost-based asynchronous LVM mirroring
- DLog shipping over IP networks
How the community answered
(31 responses)- A71% (22)
- B16% (5)
- C3% (1)
- D10% (3)
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.
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