Self-Configuring Email Server Cluster Avoids Single Points of Failure

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Solution Overview

Problem

The increasing complexity and burden of administering multiple email servers, particularly due to the risk of single points of failure and the difficulty in ensuring all servers receive updates correctly, lead to inefficiencies and potential outages in email service.

Innovation Solution

A system of interconnected email servers that self-configure and self-discover, allowing any server to act as a primary for administration and propagate changes through self-addressing and announcement protocols, eliminating the need for dedicated servers and ensuring redundancy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a dedicated email administration server (DEAS) is used to manage multiple email servers, then administration complexity is reduced and updates can be propagated centrally, but the system creates a single point of failure that can cause service outages

Engineering Contradiction:

Improveadministration complexityVSAvoidsingle point of failure

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system enables email servers to self-configure and self-manage by having them automatically discover each other on the network, self-address, and propagate configuration changes without requiring a dedicated administration server. Each server maintains its own configuration and can independently receive and apply updates from any server in the cluster.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent merges the administration function into the email servers themselves rather than separating it into a dedicated DEAS. Multiple email servers collectively provide both email processing and administration functions, eliminating the need for a separate administration server and its associated single point of failure.

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If multiple email servers are added to increase capacity and redundancy, then email processing capability improves, but administration burden and system complexity increase

Engineering Contradiction:

Improveemail processing capacityVSAvoidadministration burden

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Any email server in the cluster can serve as the administration server for the group. This universal capability means that administration functions are not tied to a specific server role but are distributed across all servers, allowing the system to scale capacity while maintaining manageable complexity through shared administration responsibilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system implements automatic feedback mechanisms where servers announce their presence and configuration changes to the network. When a server is added or configured, it automatically propagates this information to other servers, which then automatically update their own configurations without manual intervention, reducing administration burden as the system scales.

Inventive Principle:

Principle #23Feedback

3Ease of operation

If a dedicated administration server is used to propagate changes to multiple email servers, then configuration updates can be managed centrally, but ensuring all servers receive updates correctly becomes difficult when the number of servers is high

Engineering Contradiction:

Improvecentralized update managementVSAvoidupdate propagation accuracy

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The system dynamically adapts its update propagation mechanism based on the number and state of servers in the cluster. Rather than relying on a fixed centralized DEAS, the system allows any server to dynamically become the update source and automatically adjusts which servers need updates based on real-time configuration changes, making update propagation more reliable as the system scales.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Servers perform preliminary actions by announcing their presence and configuration status to the network before receiving updates. This preliminary announcement mechanism ensures that all servers are aware of the update process and can independently track and apply changes, improving update propagation accuracy without requiring centralized management of every individual server.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7617305B2Email server system and method

Publication Date: 2009.11.10 WATCHGUARD

AI summary

An email system comprises a plurality of email servers connected by a data communications network. The email system avoids single points of failure by employing multiple email servers which self configure, without requiring dedicated servers, through self addressing and discovery and announcement protocols. An email server can act as a primary email server by executing an administration tool allowing an administrator to modify the configuration data set which the email servers utilize, and the primary email server will then announce the resulting change in the version level of the configuration data set to other email servers. Each email server will then determine and request any needed updates to its respective configuration data set from the primary email server or another email server. The resulting email system is: robust, avoiding single points of failure; scalable, as additional email processing capacity can be achieved by adding additional email servers; and is simple to administer as changes to the configuration data set can be made at any email server with a copy of the appropriate administration tool and such changes automatically propagate through the email system.