How does application quiescence affect SnapMirror replication during WAN delays?

How does application quiescence affect SnapMirror replication during WAN delays?

• A. Application quiescence has no impact on RPO.
• B. Application quiescence reduces consistency.
• C. Application quiescence improves consistency and reduces RPO variability.
• D. Application quiescence increases RPO.

Answer: (C)

Application quiescence ensures the data used for replication represents a consistent application state by pausing in-flight writes and flushing in-progress transactions before the replication transfer. With WAN delays, updates can be buffered or arrive out of order, which can lead to inconsistent data at the target and more variability in the recovery point objective (RPO). By quiescing, SnapMirror transfers a stable, application-consistent point, so the remote copy remains coherent and the RPO becomes more predictable. This is why it's viewed as improving consistency and reducing RPO variability.

Application quiescence ensures the data used for replication represents a consistent application state by pausing in-flight writes and flushing in-progress transactions before the replication transfer. With WAN delays, updates can be buffered or arrive out of order, which can lead to inconsistent data at the target and more variability in the recovery point objective (RPO). By quiescing, SnapMirror transfers a stable, application-consistent point, so the remote copy remains coherent and the RPO becomes more predictable. This is why it's viewed as improving consistency and reducing RPO variability.