Figure 1: Symmetric Active-Active SAN pathing on NetApp AFF
Modern enterprise SAN environments cannot tolerate downtime. Mission‑critical databases and large‑scale VMware deployments demand continuous availability and predictable I/O behavior, with little tolerance for controller failovers or path transition delays. At the same time, organizations are under pressure to consolidate workloads onto fewer platforms without sacrificing resilience.
NetApp addresses this challenge by extending symmetric active-active SAN pathing to NetApp AFF systems with ONTAP 9.19.1, bringing the same nondisruptive SAN access model that customers value on NetApp ASA into NetApp’s unified all-flash portfolio. For AFF, this capability enables simultaneous, active-optimized access across both nodes in an HA pair, helping mission-critical SAN applications maintain continuous availability and predictable I/O behavior while running alongside NAS and other workloads on a single, proven ONTAP platform.
This extension does not blur the lines between AFF and ASA; it sharpens the role of each platform. AFF is the right choice when customers want to consolidate mission-critical SAN, NAS, and mixed enterprise workloads with shared ONTAP services, cloud mobility, and operational consistency across protocols. ASA remains NetApp’s purpose-built, block-only SAN platform, optimized for customers that want a simplified SAN experience while sustaining predictable performance and efficiency. Together, AFF and ASA give customers two strong architectural choices: unified consolidation where flexibility matters most, and dedicated block simplicity where a SAN-only operating model is a priority.
Unified Workload Centralization on NetApp AFF
Active-active architecture moves AFF closer to true mission-critical centralization. Customers can run demanding block workloads alongside file and object services on one ONTAP foundation, providing consistent availability, protection, mobility, and management across on-premises and the cloud. The result is stronger continuity for the workloads that demand it most. The primary use cases include:
- Centralize mission-critical mixed workloads: Run performance and latency sensitive databases, VMware, enterprise applications, electronic health record (EHR) systems, file services, and object-enabled workflows on AFF to reduce silos while preserving the availability and predictability that critical SAN environments require.
- Extend one data architecture across environments: Apply consistent replication, protection, dev/test, tiering, and disaster recovery across SAN, NAS, and object data, enabling movement between AFF and ONTAP-based cloud services without using separate operating models.
- Modernize data pipelines on production data: Run analytics, AI/ML, backup, and data services alongside your primary production datasets, using the right protocol for each stage and avoiding redundant copies, slow ETL workflows, and isolated staging platforms.
Technical Value
ONTAP 9.19.1 improves host I/O performance on AFF systems by introducing symmetric active-active pathing. This feature allows hosts to use concurrent active-optimized paths across both controllers in an HA pair to access data volumes. Since alternate paths stay active and optimized, host operations resume quickly during path failures, avoiding the latency associated with ALUA/ANA path state transitions. [GR1] [FD2] SAN pathing is configured at the Storage Virtual Machine (SVM) creation time, where administrators can select either symmetric active-active or traditional active-local pathing for each SVM. Existing SVMs remain unchanged, and customers can adopt active-active incrementally by creating new SVMs with active-active pathing and moving workloads over time. The core technical advantages include:[FD3]
- Continuous Availability: Active‑optimized paths across both nodes eliminate ALUA/ANA transition delays, isolating mission-critical applications from underlying network path failures.
- Simplified Storage Operations: Consolidates asymmetric structures like SCSI ALUA Target Port Groups and NVMe ANA Access Groups into a single policy in mixed block-storage environments.
- Enable Host Side Load Balancing: The storage array presents all links as active & optimized, allowing the host to perform network load balancing and distribute I/O traffic across multiple paths.
The Takeaway
With symmetric active-active SAN pathing on AFF systems, ONTAP extends mission-critical availability to unified workloads without giving up the platform advantages customers already rely on: efficiency, resilience, security, cloud mobility, and operational consistency. AFF becomes an even stronger foundation for customers standardizing mixed block, file, and object workloads across on-premises and cloud—delivering a secure, efficient, multi-protocol architecture built for today’s demands and tomorrow’s growth.
Getting Started
Whether you are modernizing your SAN infrastructure or consolidating mixed workloads, active‑active pathing on AFF provides a new design option at no additional licensing cost. Start by identifying workloads most sensitive to path disruption—such as VMware, databases, and transactional applications—and evaluate how active‑active pathing on AFF can help simplify architecture, improve access continuity, and standardize your environment on a unified platform. For configuration guidance and technical details, see the official documentation at:
https://docs.netapp.com/us-en/ontap/san-admin/multipath-automatic-lif-failover-support.html
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