By Eric Bauer

How Geographic Redundancy Can increase provider Availability and Reliability of Computer-Based SystemsEnterprises make major investments in geographically redundant structures to mitigate the impossible threat of a average or man-made catastrophe rendering their basic web site inaccessible or destroying it thoroughly. whereas geographic redundancy has visible merits for catastrophe restoration, it truly is some distance much less seen what profit georedundancy deals for extra universal undefined, software program, and human mess ups. past Redundancy offers either a theoretical and sensible remedy of the possible and sure merits from geographic redundancy for either carrier availability and repair reliability.The ebook is geared up into 3 sections:Basics offers the mandatory heritage on georedundancy and repair availabilityModeling and research of Redundancy offers the technical and mathematical information of provider availability modeling of georedundant configurationsRecommendations bargains particular tips on structure, standards, layout, trying out, and research of georedundant configurationsA entire georedundant case research is integrated to demonstrate the concepts. The booklet considers either georedundant platforms and georedundant recommendations. The textual content additionally presents a common dialogue in regards to the capital expense/operating fee tradeoff that frames approach redundancy and georedundancy. those extra good points make past Redundancy a useful source for network/system planners, IS/IT team of workers, procedure architects, method engineers, builders, testers, and catastrophe recovery/business continuity specialists and planners.

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8 HUMAN FACTORS Disaster recovery and geographical redundancy—particularly manually controlled— have a distinct human aspect. A group of humans is usually following a documented procedure and plan (including a detailing of roles and responsibilities) to perform the recovery. The success of that operation is dependent on many aspects: • How well trained the staff are on the procedures. • How well documented and tested the procedures are. , number of manual steps versus automation). , number of components).

Unfortunately, catastrophic failures occasionally occur, which simultaneously damage multiple components, modules, or even systems, and thus overwhelm the fault tolerant system design and supporting policies. These catastrophic events range from equipment and building fires to water damage from roof leaks, plumbing mishaps, and floods to physical equipment or building damage from roof collapse, earthquake, 8 Service, Risk, and Business Continuity tornado, or hurricane, to terrorism, sabotage, and acts of war.

Each tier successively will support increasingly better recovery point or recovery time objectives but at an additional cost for the business. This must be taken into account during business continuity planning. 2 SERVICE AVAILABILITY AND SERVICE RELIABILITY Enterprises spend money to deploy systems that provide valuable services to end users, enterprise staff, suppliers, or other systems. Two key operational characteristics of such a system are the service availability and service reliability delivered by the system.

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