By Eric Bauer
Approach reliability, availability and robustness are frequently no longer good understood via procedure architects, engineers and builders. they typically do not comprehend what drives customer's availability expectancies, the best way to body verifiable availability/robustness necessities, the best way to deal with and finances availability/robustness, how one can methodically architect and layout structures that meet robustness necessities, and so forth. The ebook takes a truly pragmatic method of framing reliability and robustness as a useful element of a method in order that architects, designers, builders and testers can handle it as a concrete, practical characteristic of a method, instead of an summary, non-functional notion.Content:
Chapter 1 Reliability and Availability strategies (pages 1–29):
Chapter 2 approach fundamentals (pages 31–56):
Chapter three What can get it wrong (pages 57–81):
Chapter four Failure Containment and Redundancy (pages 83–97):
Chapter five powerful layout rules (pages 99–130):
Chapter 6 errors Detection (pages 131–144):
Chapter 7 reading and Modeling Reliability and Robustness (pages 145–168):
Chapter eight Reliability specifications (pages 169–183):
Chapter nine Reliability research (pages 185–206):
Chapter 10 Reliability Budgeting and Modeling (pages 207–218):
Chapter eleven Robustness and balance checking out (pages 219–243):
Chapter 12 remaining the Loop (pages 245–261):
Chapter thirteen layout for Reliability Case research (pages 263–294):
Chapter 14 end (pages 295–300):
Chapter 15 Appendix: Assessing layout for Reliability Diligence (pages 301–314):
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Additional info for Design for Reliability: Information and Computer-Based Systems
Given the elevated risk presented by software upgrade or retrofit, careful design, clearly written procedures, and thorough testing must be performed to assure that the risk of service disruption is acceptably low. • Rollback of upgrades, updates, and retrofits. Installing and activating software upgrades, updates, retrofits, and patches is complex and there are many potential pitfalls from failures to migrate/convert a database due to unexpected data records, or countless other items. Best practice is to support a rollback mechanism to methodically revert an unsuccessful or undesirable upgrade, update, retrofit, or patch to the version of software previously used.
The application software is supported by platform software that executes on physical hardware that is organized into field-replaceable units (FRUs) that can be easily replaced; persistent storage—often arranged on FRUs—is generally included as well. Other network elements may be integral parts of the system’s robustness architecture. , database servers, or authentication, authorization, and accounting systems) may impact a system’s ability to deliver service. Interestingly, adjacent systems may also be part of the recovery architecture; for example, a domain name server or external IP switch might direct new service requests away from a failed element to a redundant element to restore service for end users.
Indd 23 8/5/2010 4:33:22 PM 24 Chapter 1 Reliability and Availability Concepts The next section defines operational profiles, describes software reliability growth theory, reviews several residual defect prediction techniques, and discusses how to evaluate prediction results. 1 Operational Profile Operational profile characterizes how a system interacts with other elements in the enterprise’s solution to deliver services to end users. A particular system can often be used in several different operational profiles, each of which may stress the system in slightly different ways, thus exposing somewhat different residual faults.
Design for Reliability: Information and Computer-Based Systems by Eric Bauer