HPE Synergy D3940 Redundant I/O Adapter

Discover the HPE Synergy D3940 Redundant I/O Adapter, a cornerstone of HPE's composable, high-availability data center design. Engineered to deliver fault-tolerant I/O paths within the Synergy fabric, the D3940 consolidates network and storage connectivity into a single, hot-swappable module, simplifying cabling and boosting operational efficiency. When deployed in an HPE Synergy environment, this adapter creates dual, redundant I/O channels that route traffic to interconnect bays, enabling seamless failover and predictable performance for critical workloads. Whether you are building a scalable private cloud, delivering virtual desktops, or running data-intensive databases, the D3940 helps you maximize uptime, streamline lifecycle management, and protect investments with proven interoperability across the Synergy ecosystem.

• Redundant I/O paths for high availability: The D3940 provides dual interconnect paths that mirror critical traffic routes between compute modules and the Synergy fabric. In practice this means if one fabric path experiences congestion or a cable fault, traffic automatically routes through the alternate path with little or no disruption to active sessions. This capability reduces planned maintenance windows and minimizes unplanned downtime, which is crucial for mission-critical databases, ERP systems, and virtualized desktops. The design also supports deterministic failover, so administrators can predict performance and recovery times during fabric maintenance. Additionally, the adapter supports path preselection and load balancing across interconnect bays to optimize throughput while preserving traffic isolation between clients and storage networks.
• High-performance, low-latency connectivity: The D3940 is engineered to handle large data transfers between compute modules and the Synergy interconnect fabric. It reduces serialization delay and provides efficient, bidirectional traffic flow across the fabric, which is essential for latency-sensitive workloads such as real-time analytics, online transaction processing, and dense virtual desktop environments. By consolidating multiple I/O lanes into a single redundant adapter, it helps reduce cabling complexity while preserving peak throughput. The result is more predictable performance during peak usage periods and consistent user experiences across your most demanding applications.
• Seamless management and automation: The D3940 integrates with HPE OneView, Synergy Composer, and standard SNMP-based monitoring to simplify fabric provisioning and ongoing health checks. Administrators can define policy-driven I/O topologies, automate firmware updates across the adapter and interconnected fabric modules, and receive proactive alerts when thresholds are exceeded. The result is faster deployment of new compute modules, easier lifecycle upkeep, and reduced risk of misconfigured interconnects that could impact performance or security. In large-scale environments, automation reduces manual steps and accelerates time-to-value for new workloads.
• Flexible deployment and easy maintenance: With its hot-pluggable design and standardized interconnect bays, the D3940 supports flexible topology layouts across HPE Synergy frames. It can be swapped during maintenance windows without powering down the entire system (subject to frame capabilities), enabling non-disruptive upgrades and replacements. The adapter supports multiple I/O profiles and port mapping schemes, allowing you to tailor connectivity to your specific workloads—whether you need dedicated storage I/O, high-bandwidth network access, or a balanced mix. Field-proven reliability and straightforward cabling help streamline racking, reduce cable clutter, and simplify future expansions as your data center grows.
• Reliability and support for enterprise workloads: The HPE Synergy D3940 is built for enterprise reliability, featuring a robust thermal design, fault-tolerant components, and strict quality assurance. It is supported by HPE's global service network, with warranty coverage and access to firmware updates that align with your Synergy frame’s lifecycle. For organizations pursuing uptime SLAs, this adapter helps minimize maintenance impact and provides predictable performance under heavy load. Coupled with HPE's interconnect ecosystem, the D3940 is part of a broader strategy for resilient data-center operations, enabling you to scale resources while maintaining consistent service levels, security, and compliance across your virtualized and containerized workloads.

Technical Details of HPE Synergy D3940 Redundant I/O Adapter

• Product type: Redundant I/O Adapter for HPE Synergy
• Interconnect compatibility: Compatible with HPE Synergy interconnect bays within supported frames; intended for use with Synergy compute modules and fabric interconnects
• Form factor: PCIe-based adapter designed for plug-in installation in Synergy compute modules and interconnect trays
• Redundancy: Provides dual I/O paths to the fabric to enable failover and balanced load across interconnects
• Management and firmware: Configurable via HPE OneView/Synergy Composer; firmware updates coordinated with Synergy fabric to maintain compatibility
• Power and environmental: Designed for enterprise data center conditions with standard power and cooling requirements of the Synergy environment

How to install HPE Synergy D3940 Redundant I/O Adapter

Follow these steps to install the D3940 safely and correctly in a compatible HPE Synergy environment:

• Prepare the environment: verify you are running compatible Synergy frame and interconnect firmware versions; gather required cables and tools per your deployment plan.
• Power-down protocol: adhere to your data center's power-down procedures or perform a non-disruptive hot-plug installation where supported by your frame and interconnect capabilities.
• Access the interconnect area: open the appropriate Synergy enclosure panel and identify the designated interconnect bay for the D3940 according to the system documentation.
• Install the adapter: align the D3940 with the interconnect bay connectors and firmly seat it into place until it is fully seated and secured by the standard retention mechanism.
• Connect cabling to I/O ports: attach the required network and storage cables to the adapter ports as per your topology and fabric design, ensuring correct port orientation and labeling.
• Power up and configure: restore power, monitor the interconnect bay and adapter indicators, and use HPE OneView or the Synergy Composer CLI to configure the dual I/O paths and firmware levels.
• Verify operation: confirm link status, throughput, and failover behavior by testing path continuity and validating seamless recovery during simulated interruptions in a controlled scenario.
• Document and maintain: record the installation details, firmware levels, and cabling mapping for ongoing maintenance and future upgrades.

Frequently asked questions

• Q: What is the HPE Synergy D3940 Redundant I/O Adapter?

  A: It is a plug-in module that provides dual, redundant I/O pathways to the HPE Synergy fabric, enabling high availability and scalable connectivity for compute modules and interconnect bays within a Synergy environment.

• Q: Is the D3940 hot-swappable?

  A: Yes. The D3940 is designed for hot-plug operation within compatible Synergy frames, allowing non-disruptive maintenance and quick replacements.

• Q: How do I manage the D3940?

  A: Management is provided through HPE OneView and Synergy Composer, with firmware coordinated across the adapter and fabric interconnects to simplify provisioning and monitoring.

• Q: Do I need to update firmware?

  A: Yes. Ensure that the D3940 firmware matches the interconnect chassis and compute module firmware versions to maintain compatibility and performance.

• Q: What workloads is the D3940 suited for?

  A: It is designed for enterprise-class workloads in HPE Synergy environments, including virtualization, databases, virtual desktop infrastructure, and cloud-native applications requiring reliable I/O connectivity and high availability.