NCS-CORE practice question 11 of 35

An administrator protected a DB VM running on a Nutanix cluster with NearSync Replication, which schedules to repeat every 15 minutes □ to a second site. The daily change rate is low. During nightly backups, the replication window is missed due to write volume. Which two options describe the expected behavior? (Choose two.)

Full set: 302 questions
Answer options
A: NearSync stops working and fails over to the remote site.
B: Protection Domain transitions back to the hourly schedule. Correct answer
C: The Administrator needs to re-enable it manually.
D: The system continuously tries to get to the NearSync schedule. Correct answer
Correct Answer:
B. Protection Domain transitions back to the hourly schedule.; D. The system continuously tries to get to the NearSync schedule.
Explanation

Nutanix NearSync is designed for high availability with a low Recovery Point Objective (RPO). When a high write volume, such as from a backup operation, prevents the system from meeting the configured NearSync RPO (e.g., 15 minutes), an automatic fallback mechanism is triggered. The system temporarily transitions the Protection Domain to the next-highest configured schedule, which is typically an hourly schedule, to ensure a successful replication occurs. Concurrently, the system does not abandon the NearSync goal; it continuously monitors the workload and will automatically attempt to resume the NearSync schedule once the I/O load subsides and the RPO can be met again.

Why Incorrect

A. NearSync stops working and fails over to the remote site: A missed replication schedule is not a trigger for a disaster recovery failover. Failover is a separate, deliberate action.
C. The Administrator needs to re-enable it manually: The transition between NearSync and hourly schedules is an automatic, built-in resiliency feature that does not require manual intervention.

References

1. Nutanix Data Protection and Recovery Guide (v6.5), Chapter: "Data Protection with NearSync Replication", Section: "NearSync Behavior". The documentation states: "If the system cannot maintain the NearSync schedule because of network latency or bandwidth issues, it automatically reverts to the hourly schedule. When the issue is resolved, the system returns to the NearSync schedule." This confirms both the fallback (B) and the continuous attempt to return (D).

2. Nutanix Bible, Section: "Data Protection". This resource explains that if the change rate is too high for the NearSync RPO, "the system will automatically switch to using the vDisk based snapshots (hourly) to ensure you have a valid recovery point." It also notes the system will revert to NearSync when possible.

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