A StorageGRID installation is using two sites with multiple SG1100 services appliances for client access.

Adding another SG1100 services appliance increases aggregate client throughput because each SG1100 can operate as a Gateway Node running the StorageGRID Load Balancer service. With DNS Round Robin, client connections are distributed across the available services appliances, allowing the aggregate load-balancing capacity to scale horizontally. NetApp explicitly identifies increased aggregate throughput and no idle hosts as advantages of the DNS Round Robin load-balancing model.

The SG1100 is specifically designed to provide high-performance Gateway Node and Admin Node services and supports high-speed network connectivity up to 100 GbE. Adding another equivalent SG1100 therefore provides additional processing and network capacity while preserving consistent performance characteristics across the load-balancer pool. NetApp cautions against mixing services appliances with substantially different performance levels when balancing client traffic.

Option B is incorrect because the SGF6112 is a Storage Node appliance, while StorageGRID load-balancer caching is available only on Gateway Nodes. Option C does not provide the same intended horizontal client-throughput expansion. Option D would substitute an SG110, a lower-performance services appliance, and could create inconsistent load-balancing performance.

Therefore, A is the correct answer.

Reference topics: StorageGRID Load Balancing → DNS Round Robin → SG1100 Services Appliances → Gateway Nodes → Aggregate Client Throughput