Which statement best describes SANtricity's I/O processing model?

Which statement best describes SANtricity's I/O processing model?

• A. A loosely coupled controller design optimized for NAS workloads
• B. A tightly coupled, symmetric active-active controller architecture
• C. A single-controller architecture designed for JBOD expansion
• D. A scale-out file system with node-based failover

Answer: (B)

SANtricity processes I/O using a tightly coupled, symmetric active-active controller architecture. In this setup, two controllers act as peers rather than a master and a standby. They are closely connected and share a common cache and I/O paths, allowing both controllers to actively handle host I/O and coordinate access to disks. This design provides high throughput, balanced workload distribution, and seamless failover—if one controller encounters a failure, the other continues servicing I/O with minimal disruption. This contrasts with a loosely coupled or single-controller approach, which would either leave performance endpoints isolated or create a single point of failure. It also isn’t a scale-out file system with node-based failover, since SANtricity is focused on a dual-controller, block-level SAN architecture rather than a distributed file system model.

SANtricity processes I/O using a tightly coupled, symmetric active-active controller architecture. In this setup, two controllers act as peers rather than a master and a standby. They are closely connected and share a common cache and I/O paths, allowing both controllers to actively handle host I/O and coordinate access to disks. This design provides high throughput, balanced workload distribution, and seamless failover—if one controller encounters a failure, the other continues servicing I/O with minimal disruption.

This contrasts with a loosely coupled or single-controller approach, which would either leave performance endpoints isolated or create a single point of failure. It also isn’t a scale-out file system with node-based failover, since SANtricity is focused on a dual-controller, block-level SAN architecture rather than a distributed file system model.