Switch Fabric Management via Midplane Interconnect

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Solution Overview

Problem

Existing server systems face challenges in reducing wiring complexity and minimizing the impact of switch failures, which can lead to single points of failure and increased repair complexity.

Innovation Solution

A server system design that includes a midplane with a fabric interconnect for managing switch modules, reducing the need for additional interconnects and allowing for hot-swappable interposer cards and server cards, thereby minimizing wiring and enabling redundant pathing to eliminate single points of failure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If additional interconnects are used to manage switch modules, then management capability is improved, but wiring complexity increases

Engineering Contradiction:

Improveswitch module management capabilityVSAvoidwiring complexity

Core Design Contradiction:

Extent of automationVSDevice complexity

Solution Approach 1:

The patent combines the management interconnect functions with the existing fabric interconnect by implementing a management controller on the midplane that utilizes the fabric interconnect's wiring to manage switch modules. This merging eliminates the need for separate management interconnects, reducing wiring complexity while maintaining full management capability.

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If switch modules are integrated into the system, then network traffic switching capability is improved, but single points of failure increase

Engineering Contradiction:

Improvenetwork traffic switching capabilityVSAvoidsystem availability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the switch fabric into multiple independent switch modules that can be individually managed and replaced. Each switch module operates independently, allowing faulty modules to be identified and replaced without affecting the entire switch fabric, thereby eliminating single points of failure while maintaining high switching capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements hot-swappable switch modules that can be dynamically added or removed from the system without shutting down the entire server system. This dynamic capability allows for seamless replacement of faulty modules, maintaining system availability and eliminating single points of failure.

Inventive Principle:

Principle #15Dynamics

3Reliability

If hot-swappable cards are implemented, then system availability is improved, but device complexity increases

Engineering Contradiction:

Improvesystem availabilityVSAvoidhot-swap mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements universal hot-swappable interposer cards and server cards that can be replaced without system shutdown. The standardized card designs with integrated connectors and power management allow for simple hot-swap operations, reducing the actual complexity of the hot-swap mechanism while significantly improving system availability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8948000B2Switch fabric management

Publication Date: 2015.02.03 LENOVO GLOBAL TECHNOLOGIES SWITZERLAND INTERNATIONAL GMBH

AI summary

Techniques are disclosed for managing a switch fabric. In one embodiment, a server system is provided that includes a midplane, one or more server cards, switch modules and a management controller. The midplane may include a fabric interconnect for a switch fabric. The one or more server cards and the switch modules may be operatively connected to the midplane. The switch modules may be configured to switch network traffic for the one or more server cards. The management controller may be configured to manage the switch modules via the fabric interconnect.