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| Energy Impact of Increased Server Inlet Temperature |
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| by APC |
| The quest for efficiency improvement raises questions regarding the optimal air temperature for data centers. The ASHRAE TC-9.9 committee has recently adopted an extension of the recommended thermal envelope for server inlet temperature and humidity. A popular hypothesis suggests that total energy demands should diminish as the server inlet temperatures increase. This paper tests that hypothesis through the development of a composite power consumption baseline for a mixture of servers as a function of inlet temperature and applying this data to a variety of cooling architectures. |
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| Energy Efficient Cooling for Data Centers: A Close-Coupled Row Solution |
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| by APC |
| The trend of increasing heat densities in data centers has held consistent with advances in computing technology for many years. As power density increased, it became evident that the degree of difficulty in cooling these higher power demand loads was also increasing. In recent years, traditional cooling system design has proven inadequate to remove concentrated heat loads (up to and greater than 20 kW per rack). This has driven an architectural shift in data center cooling. The advent of a newer cooling architecture that was designed for the higher densities has brought with it increased efficiencies for the data center. This article discusses the efficiency benefits of row-based cooling compared to two other common cooling architectures. |
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| Monitoring Physical Threats in the Data Center |
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| by APC |
| Traditional methodologies for monitoring the data center environment are no longer sufficient. With technologies such as blade servers driving up cooling demands and regulations such as Sarbanes-Oxley driving up data security requirements, the physical environment in the data center must be watched more closely. While well understood protocols exist for monitoring physical devices such as UPS systems, computer room air conditioners, and fire suppression systems, there is a class of distributed monitoring points that is often ignored. This paper describes this class of threats, suggests approaches to deploying monitoring devices, and provides best practices in leveraging the collected data to reduce downtime. |
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| Ten Cooling Solutions to Support High-Density Server Deployment |
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| by APC |
| High-density servers offer a significant performance per watt benefit. However, depending on the deployment, they can present a significant cooling challenge. Vendors are now designing servers that can demand over 40 kW of cooling per rack. With most data centers designed to cool an average of no more than 2 kW per rack, innovative strategies must be used for proper cooling of high-density equipment. This paper provides ten approaches for increasing cooling efficiency, cooling capacity, and power density in existing data centers. |
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| Preventing Data Corruption in the Event of an Extended Power Outage |
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| by APC |
| Despite advances in computer technology, power outages continue to be a major cause of PC and server downtime. Protecting computer systems with Uninterruptible Power Supply (UPS) hardware is part of a total solution, but power management software is also necessary to prevent data corruption after extended power outages. Various software configurations are discussed, and best practices aimed at ensuring uptime are presented. |
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| Effective Management of Static Analysis Vulnerabilities and Defects |
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| by Coverity |
| Whether your organization utilizes an agile or waterfall development methodology, the addition of static analysis will bring about a change in the way your development team thinks about their code. This is because an accurate static analysis tool is a source of information that demands the attention of developers, QA testers, and managers alike. Read this white paper to learn best practices for managing statically detected defects, as well as how to set the right static analysis defect reduction goals for you and your team. |
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| The Seven Deadly Myths of Software Security |
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| by Coverity |
Hugh Thompson, Chief Security Strategist at People Security and a world-renowned expert in application security, debunks several important software security myths.
In this paper, we outline some of the most prevalent myths about security that you should consider when looking to improve the security of your software. Falling prey to these deadly myths could at best cause you to waste valuable cycles on useless "security" activities or at worst, cause your applications to be less secure. |
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| Electrical Efficiency Measurement for Data Centers |
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| by APC |
| Data center electrical efficiency is rarely planned or managed. The unfortunate result is that most data centers waste substantial amounts of electricity. Today it is both possible and prudent to plan, measure, and improve data center efficiency. In addition to reducing electrical consumption, efficiency improvements can gain users higher IT power densities and the ability to install more IT equipment in a given installation. This paper explains how data center efficiency can be measured, evaluated, and modeled, including a comparison of the benefits of periodic assessment vs. continuous monitoring. |
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| The Different Types of UPS systems |
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| by APC |
| There is much confusion in the marketplace about the different types of UPS systems and their characteristics. Each of these UPS types is defined, practical applications of each are discussed, and advantages and disadvantages are listed. With this information, an educated decision can be made as to the appropriate UPS topology for a given need. |
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| Power and Cooling for VoIP and IP Telephony Applications |
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| by APC |
| Voice Over IP (VoIP) deployments can cause unexpected or unplanned power and cooling requirements in wiring closets and wiring rooms. Most wiring closets do not have uninterruptible power available, and they do not provide the ventilation or cooling required to prevent equipment overheating. Understanding the unique cooling and powering needs of VoIP equipment allows planning for a successful and cost effective VoIP deployment. This paper explains how to plan for VoIP power and cooling needs, and describes simple, fast, reliable, and cost effective strategies for upgrading old facilities and building new facilities. |
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| Making Large UPS Systems More Efficient |
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| by APC |
| As energy resources become scarcer and more expensive, electrical efficiency is becoming a more important performance factor in the specification and selection of large UPS systems. There are three subtle but significant factors that can materially affect a company’s cost of operating a UPS system and particularly the electrical bill. Unfortunately, the people who specify systems often fail to recognize these factors, which leads to increased costs to the owner because operational efficiencies are not correctly considered. This paper discusses the common errors and misunderstandings in evaluating UPS efficiency. UPS efficiency curves are explained, compared, and their cost implications quantified. |
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| Data Center Projects: Project Management |
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| by APC |
| In data center design/build projects, flaws in project management and coordination are a common – but unnecessary – cause of delays, expense, and frustration. The ideal is for project management activities to be structured and standardized like interlocking building blocks, so all parties can communicate with a common language, avoid responsibility gaps and duplication of effort, and achieve an efficient process with a predictable outcome. This paper presents a framework for project management roles and relationships that is understandable, comprehensive, and adaptable to any size project. |
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| Ten Errors to Avoid When Commissioning a Data Center |
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| by APC |
| Data center commissioning can deliver an unbiased evaluation of whether a newly constructed data center will be an operational success or a failure. Proper execution of the commissioning process is a critical step in determining how the data center operates as an integrated system. The documentation produced as a result of commissioning is also the single, most enduring value added deliverable in a data center′s operational life. This paper outlines the ten most common errors that prevent successful execution of the commissioning process. |
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| Meeting DO-178B Software Verification Guidelines with Coverity Integrity Center |
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| by Coverity |
The Federal Aviation Administration (FAA) recognizes DO-178B, one of the most stringent standards in use in the software development industry, as an acceptable means of compliance for securing the FAA approval of software in airborne systems and equipment.
This document will discuss how the Coverity Integrity Center can help with specific software verification guidelines as outlined in DO-178B. |
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| Hot Aisle vs Cold Aisle Containment |
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| by APC |
| Both hot and cold air containment can significantly improve the predictability and efficiency of data center cooling systems. While both approaches eliminate the mixing of hot and cold air, there are practical differences in implementation that have significant consequences. This paper examines both methodologies and highlights the reasons why hot aisle containment emerges as the preferred best practice. |
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