The primary purpose of a MetroCluster solution is to provide continuous data availability and disaster recovery across two geographically separate sites. It achieves this through synchronous data replication, which mirrors every write operation to the partner site in real-time. This architecture ensures that if a disaster strikes one site, an identical, up-to-date copy of the data is available at the second site, allowing for non-disruptive failover with a Recovery Point Objective (RPO) of zero.

A. Storage compression is a data efficiency feature available in ONTAP, but it is not the primary driver for implementing a MetroCluster.

C. MetroCluster inherently increases network traffic between sites due to the constant synchronous replication of data writes.

D. MetroCluster is a high-availability solution; it does not automatically manage or increase storage capacity, which remains an administrative task.

1. NetApp. (2023). TR-4705: MetroCluster Solution Architecture and Design. Page 6, Section: "Introduction to the MetroCluster solution." States, "The NetApp MetroCluster solution is a high-availability and disaster-recovery solution that provides synchronous replication... for a recovery point objective (RPO) of zero."

2. NetApp. (2023). MetroCluster Concepts for ONTAP 9.13.1. NetApp Documentation. Section: "What MetroCluster configuration provides." This section details the solution's ability to provide continuous data availability through synchronous replication.