Beyond Redundancy: How Geographic Redundancy Can Improve by Eric Bauer

By Eric Bauer

How Geographic Redundancy Can increase carrier Availability and Reliability of Computer-Based SystemsEnterprises make major investments in geographically redundant structures to mitigate the most unlikely possibility of a traditional or man-made catastrophe rendering their basic web site inaccessible or destroying it thoroughly. whereas geographic redundancy has noticeable merits for catastrophe restoration, it truly is a long way much less visible what profit georedundancy bargains for extra universal undefined, software program, and human disasters. past Redundancy offers either a theoretical and functional remedy of the possible and sure merits from geographic redundancy for either carrier availability and repair reliability.The publication is prepared into 3 sections:Basics presents the mandatory heritage on georedundancy and repair availabilityModeling and research of Redundancy provides the technical and mathematical information of carrier availability modeling of georedundant configurationsRecommendations deals particular tips about structure, specifications, layout, checking out, and research of georedundant configurationsA entire georedundant case learn is integrated to demonstrate the thoughts. The ebook considers either georedundant platforms and georedundant strategies. The textual content additionally offers a basic dialogue in regards to the capital expense/operating cost tradeoff that frames method redundancy and georedundancy. those further gains make past Redundancy a useful source for network/system planners, IS/IT team of workers, method architects, approach engineers, builders, testers, and catastrophe recovery/business continuity experts and planners.

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Extra resources for Beyond Redundancy: How Geographic Redundancy Can Improve Service Availability and Reliability of Computer-Based Systems

Example text

The system offering the service or application must be available to serve users. ╇ The probability that a session oriented service will correctly accept a valid session request and deliver acceptable service is dependent upon the application’s availability and reliability. ╇ Reliability, availability, and quality of service. ╇ The probability that a properly formed and authorized client request is correctly served with acceptable quality of service is primarily a function of the transactional reliability of the application.

Generally, it takes less time to prepare it to take over as the active module than a cold standby element and has been configured to be the standby mate for a particular network element. ╇ A cold standby network element generally does not have its software and data installed and as a result they must be installed and configured as part of disaster recovery before it can assume service for a failed network element. As a result, it takes the longest to become available. Sometimes, it is used as a spare for multiple network elements, and is thus installed once it is determined which element needs to be backed up.

It may be economically advantageous for an enterprise to contract for disaster recovery services, thus transferring some risk to a supplier. It may also be prudent to arrange for insurance coverage to hedge direct and indirect costs of major unavailability risks. ╇ Some risks are retained by the enterprise itself as a normal part of business operations and policy. Usually, the enterprise retains the risk for minor or typical failures, such as failure of single-user devices, like laptops or smartphones.

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