Blueprints for high availability by Evan Marcus

By Evan Marcus

"Rely in this publication for info at the applied sciences and techniques you will have to layout and enforce high-availability systems...It can assist you rework the imaginative and prescient of always-on networks right into a reality."-Dr. Eric Schmidt, Chairman and CEO, Novell Corporation
Your approach will crash! the explanation can be anything as complicated as community congestion or whatever as mundane as an working method fault. the excellent news is that there are steps you could take to maximise your procedure availability and forestall severe downtime. This authoritative ebook gives you the instruments to install a method with self belief. The authors advisor you thru the development of a community that runs with excessive availability, resiliency, and predictability. They basically assist you determine the weather of a procedure that could fail, choose the ideal point of reliability, and supply steps for designing, imposing, and trying out your technique to lessen downtime to a minimal. the entire whereas, they assist you identify how a lot you could have enough money to spend by means of balancing bills and advantages. This booklet of sensible, hands-on blueprints:
* Examines what can get it wrong with a few of the elements of your system
* offers twenty key procedure layout ideas for achieving resilience and excessive availability
* Discusses easy methods to organize disks and disk arrays for defense opposed to failures
* appears to be like at failovers, the software program that manages them, and varieties throughout the myriad of other failover configurations
* presents suggestions for bettering community reliability and redundancy
* reports thoughts for replicating facts and purposes to different platforms throughout a network
* bargains information on software recovery
* Examines catastrophe restoration

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The heart of a database system is the server process, or database engine, the main and primary database component that does the reading and writing to the disk, manages the placement of data, and responds to queries with (we hope) the correct answers. If this process stops working, all users accessing the database stop working. The database engine may be assisted by reader-writer or block manager processes that handle disk I/O operations for the engine, allowing it to execute database requests while other processes coordinate I/O and manage the disk block cache.

Chapter 2, “What to Measure,” takes a look at the numbers and statistics that go into measuring availability, as well as what can go wrong with the various components of your system. This chapter also looks at measurement trends, such as six sigma and “nines,” that are becoming more common metrics for system quality. Chapter 3 introduces the Availability Index in some detail and looks at the business case for availability. Chapter 4, “The Politics of Availability,” is a primer on how to introduce the concept of availability into your organization and how to deal with some of the politics and other potential organizational roadblocks.

Acceptable outages in a telephone network are in the subsecond range; anything longer gets counted as a User Impacted Minute (UIM) that typically gets reported to the FCC. ■■ On a trading floor, outages in the subminute range can be tolerated (usually not well, though) before impact is felt. Regulatory issues concerning on-time trade reporting kick in within two minutes. The market moves every few seconds, possibly making a profitable trade less interesting only a few seconds later. ■■ If a decision support system is driving a mass mailing that has a deadline 48 hours away, and it takes 4 hours to finish a single query, your uptime requirements are stronger than if the mailing deadline is in the next month.

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