Assuming the exhibit illustrates a disaster recovery setup between two distinct Nutanix sites managed by Prism Central, with configured Protection Policies and Recovery Plans, the correct term is Smart DR. Smart DR is the Nutanix orchestration solution that automates application and data recovery between sites. It encompasses the policies for replication (such as Async or NearSync schedules) and the plans for executing failover and failback operations. This provides a comprehensive framework for recovering from a site-wide outage with a non-zero Recovery Point Objective (RPO).

B. Metro Availability: This is a synchronous replication (RPO=0) solution for continuous availability between two sites with very low latency (<5ms RTT), which is a different architecture.

C. Availability Zones: This feature, also known as rack awareness, provides high availability within a single cluster by distributing data across different fault domains, not DR between separate clusters.

D. NearSync: This refers specifically to a replication schedule with a very low RPO (1-15 minutes). While it can be used by Smart DR, "Smart DR" describes the entire orchestration solution.

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1. Prism Central Guide (pc.2023.4)

Chapter: Disaster Recovery (DR) with Prism Central

Section: Nutanix DR Solutions (Smart DR): "Nutanix DR solutions (also known as Smart DR) provide a way to recover from a disaster with minimal RPO and RTO. Nutanix DR solutions use the protection policy and recovery plan-based DR configuration." This defines Smart DR as the overarching orchestration solution.

2. Data Protection and Recovery with Prism Element Guide (AOS 6.7)

Chapter: Data Protection

Section: Metro Availability for DR (RPO 0): "Metro Availability is a continuous availability solution that provides a global file system namespace across a container stretched between two sites... The recovery point objective (RPO) is zero." This distinguishes it from asynchronous solutions.

3. Data Protection and Recovery with Prism Element Guide (AOS 6.7)

Chapter: Data Protection

Section: Asynchronous DR with a Near-sync Schedule (1 to 15 minutes RPO): "Near-sync replication provides a lightweight snapshot-based solution that offers a low RPO... You can set an RPO of 1 to 15 minutes." This identifies NearSync as a specific schedule type

not the entire DR framework.

4. Prism Element Web Console Guide (AOS 6.7)

Chapter: Cluster Management

Section: Rack Configuration: "Nutanix provides a rack fault tolerance feature... When you create a rack configuration

the cluster can sustain the failure of one or more racks... This feature is also known as rack awareness." This clarifies that Availability Zones (rack awareness) are for intra-cluster high availability.