NDB supports high availability (HA) across multiple Nutanix clusters, including those in separate data centers, by replicating data and ensuring failover capabilities. However, NDB imposes strict network latency requirements for HA. The official documentation specifies that the round-trip time (RTT) latency between clusters should not exceed 25ms for HA to function effectively. If the latency between two clusters exceeds this threshold (e.g., due to geographic distance or network issues), HA cannot be enabled, as the synchronization and failover mechanisms rely on low-latency communication to maintain consistency and performance.
Impact of other options:
A. HA will operate with increased delay: While latency might cause delays, exceeding 25ms RTT prevents HA setup entirely, not just delays its operation.
C. The clusters will not synchronize: Synchronization issues may occur as a symptom, but the primary impact is HA enablement failure.
D. There will be no impact on HA functionality: This is incorrect, as latency beyond 25ms RTT violates HA prerequisites.
Thus, the verified answer is B, reflecting NDB’s latency constraints for HA across clusters.
Official Nutanix Database Automation References
Nutanix Database Management & Automation (NDMA) course, Module 4: High Availability and Disaster Recovery, Lesson 4.2: Configuring Multi-Cluster HA.
Nutanix Certified Professional - Database Automation (NCP-DB) v7.5Knowledge Objectives, Section 4: Troubleshoot NDB Solutions, Objective 4.3: Configure HA Across Clusters (applicable to v7.5).
Nutanix NDB Administration Guide: "High Availability Configuration Requirements" section, specifying latency limits.
