Which cluster configuration is considered a cost-effective, nondisruptively scalable solution?

The 2-node switchless cluster configuration is considered a cost-effective and nondisruptively scalable solution due to its efficient use of resources and minimal complexity. In this configuration, two nodes are connected directly to each other without the need for additional switching hardware. This setup not only reduces costs associated with purchasing and maintaining switches but also simplifies the network architecture, resulting in lower latency and increased performance between the nodes.

Furthermore, scalability is achieved nondisruptively since you can add additional nodes to the cluster without impacting the existing operations or requiring substantial reconfigurations. This is particularly advantageous for organizations that need to grow their storage capabilities over time without incurring significant downtime or operational disruptions. In scenarios where cost management and growth flexibility are critical, the two-node switchless design provides a practical and efficient solution.