Thermal Surrogate for Server Airflow Measurement

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Solution Overview

Problem

The increasing density and varying form factors of data storage devices within servers make it difficult to accurately understand and verify airflow across these devices, leading to inefficiencies in cooling and potential overheating, as traditional airflow sensors are insufficient for determining airflow at individual devices.

Innovation Solution

The use of thermal surrogates with a housing matching the form factor of data storage devices, equipped with airflow sensors, allows for the measurement and monitoring of airflow within the server chassis, providing detailed airflow data to optimize cooling efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional airflow sensors are used in the chassis system, then the overall airflow can be monitored, but the airflow at individual data storage devices cannot be accurately determined

Engineering Contradiction:

Improveairflow measurement precisionVSAvoidsensor placement complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

A thermal surrogate device is introduced as an intermediary between the airflow and the measurement system. This surrogate includes a heat generating element and a temperature sensor, allowing indirect measurement of airflow through thermal interaction. The surrogate acts as a mediator that converts airflow information into measurable temperature changes without requiring direct airflow sensing at each device location.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical airflow sensing with a thermal-based measurement approach. Instead of using airflow sensors that directly measure air movement, the system uses temperature sensors that detect thermal changes caused by airflow over heated surfaces. This substitution enables precise airflow measurement at individual device locations without the complexity of placing airflow sensors throughout the chassis.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Quantity of substance

If data storage device density is increased within the server, then storage capacity improves, but airflow verification and cooling effectiveness deteriorate

Engineering Contradiction:

Improvedata storage device densityVSAvoidcooling effectiveness

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The measurement system is segmented to provide individual airflow monitoring for each data storage device or chassis location. Multiple thermal surrogates are distributed throughout the chassis, each independently measuring airflow at its specific location. This segmentation allows verification of cooling effectiveness at each device level despite increased density, ensuring that no individual device is starved of airflow.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system implements feedback by continuously monitoring temperature changes at each thermal surrogate location and using this information to verify airflow sufficiency. The temperature data provides real-time feedback on cooling effectiveness, allowing system operators to identify and address airflow distribution issues that arise from increased device density.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If varying form factors of data storage devices are accommodated, then device versatility improves, but airflow understanding and verification become more difficult

Engineering Contradiction:

Improveform factor compatibilityVSAvoidairflow verification difficulty

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The thermal surrogate device is designed as a universal measurement tool that can be deployed in various chassis configurations and device arrangements. The surrogate itself has a standardized form factor that fits in designated measurement locations, while the array of surrogates collectively accommodates various data storage device form factors. This universality maintains airflow verification capability despite diversity in stored device formats.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach enables a thorough understanding of airflow across data storage devices, allowing for improved cooling characteristics and extended device lifespan by optimizing airflow distribution and thermal management within the server system.

Implementation Method 1

an airflow sensor attached to the sensor fixture and configured to measure an airflow through the housing

Methodology Applied

Scientific EffectAirflow sensing:

Data Source

PatentUS11828770B2Thermal surrogate for a data storage device

Publication Date: 2023.11.28 SANDISK TECHNOLOGIES LLC

AI summary

A thermal surrogate device is configured to replace a data storage device within a server or other multiple data storage device system. The thermal surrogate device has a housing that has a form factor identical to the data storage device. The housing has a cavity along a length, and a sensor fixture is positioned within the housing. An airflow sensor is attached to the sensor fixture and configured to measure an airflow through the housing. The housing is configured to be installed within a slot for a data storage device in a multiple memory system.