What should a protection group in a stretched pod be used for?

A stretched pod is the fundamental management object for Pure Storage ActiveCluster, which provides synchronous replication and automatic, transparent failover between two sites. To add a third-site disaster recovery (DR) capability, the entire stretched pod is placed into a protection group. This protection group is then configured with a snapshot schedule and an asynchronous replication target. This architecture effectively integrates ActiveCluster's high availability (zero RPO) with point-in-time asynchronous replication, providing comprehensive protection against both site-level failures and regional disasters.

B. Using CloudSnap to offload to a third-site target: While CloudSnap can be a target for a protection group containing a stretched pod, it is a specific implementation of asynchronous replication, making option A the more fundamental and encompassing answer.

C. Initiating ActiveDR failover/failback in a test scenario: ActiveDR is a separate, near-synchronous replication technology. It is not used in conjunction with ActiveCluster, which is a synchronous replication solution.

D. Configuring fan-out async snapshot replication: Fan-out (one-to-many) replication is a possible configuration, but the primary purpose is the integration of asynchronous replication itself, not specifically the fan-out topology.

1. Pure Storage, "ActiveCluster™ Technical Overview": In the section titled "Three-Site Replication with Asynchronous Replication," the document states, "For disaster recovery protection against a regional outage, asynchronous replication can be configured from the ActiveCluster pod to a third FlashArray. This is accomplished by adding the pod to a protection group and configuring the protection group to replicate to a third array." This directly validates that the purpose is to integrate ActiveCluster with asynchronous replication.

2. Pure Storage, "Purity//FA Asynchronous Replication Configuration and Best Practices Guide": The section on "Replicating ActiveCluster Pods" details the procedure: "To replicate a pod that has been stretched between two arrays (an ActiveCluster configuration), add the pod to a protection group. The pod acts as a consistency group for all volumes within it... The protection group snapshots can then be replicated to a third array." This confirms the mechanism and purpose described in the correct answer.