By Eric Bauer
How Geographic Redundancy Can enhance provider Availability and Reliability of Computer-Based SystemsEnterprises make major investments in geographically redundant structures to mitigate the impossible hazard of a ordinary or man-made catastrophe rendering their fundamental website inaccessible or destroying it thoroughly. whereas geographic redundancy has seen merits for catastrophe restoration, it truly is a ways much less noticeable what gain georedundancy bargains for extra universal undefined, software program, and human mess ups. past Redundancy presents either a theoretical and functional therapy of the possible and sure advantages from geographic redundancy for either provider availability and repair reliability.The e-book is prepared into 3 sections:Basics presents the required historical past on georedundancy and repair availabilityModeling and research of Redundancy provides the technical and mathematical information of provider availability modeling of georedundant configurationsRecommendations bargains particular tips on structure, requisites, layout, checking out, and research of georedundant configurationsA entire georedundant case learn is integrated to demonstrate the thoughts. The e-book considers either georedundant platforms and georedundant strategies. The textual content additionally presents a common dialogue in regards to the capital expense/operating rate tradeoff that frames procedure redundancy and georedundancy. those additional positive factors make past Redundancy a useful source for network/system planners, IS/IT body of workers, method architects, method engineers, builders, testers, and catastrophe recovery/business continuity specialists and planners.
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Extra resources for Beyond Redundancy: How Geographic Redundancy Can Improve Service Availability and Reliability of Computer-Based Systems
Since enterprises are generally incapable of influencing the frequency, timing, nature, or magnitude of catastrophic events, enterprises must focus on mitigating the risk of external attributable events, including events that render physical sites temporarily or permanently inaccessible. 3 CATASTROPHIC FAILURES AND GEOGRAPHIC REDUNDANCY Failures are inevitable in the real world, and fault tolerant designs anticipate singlefailure events and include mechanisms, policies, and procedures to mitigate single failure events with minimal service disruption.
Normalizing on the number of provisioned users can understate the apparent user impact, because although only a fraction of provisioned users may be online at any point an outage is significant to them. Normalizing on the number of active users can overstate the customer impact of events that occur in off hours when traffic is very light. Thus, it is common for sophisticated enterprises to explicitly track minutes (or seconds) of severely impacted service as absolute availability impact, and normalize it in reports to permit sensible month-by-month, quarter-by-quarter, and year-by-year comparisons.
3 Outage Attributability It is useful to establish outage attributability rules so that suppliers and enterprises will agree on who is accountable for each outage. TL 9000 formally partitions outage attributability into three categories: product attributable, enterprise1 attributable, and external attributable. These categories are defined as: 1. â•‡ Some outages are primarily attributable to the design or failure of the system’s software or hardware itself. , d) procedural error caused by the [system supplier], e) the system failing to provide the necessary information to conduct a conclusive root cause determination, or f) one or more of the above.
Beyond Redundancy: How Geographic Redundancy Can Improve Service Availability and Reliability of Computer-Based Systems by Eric Bauer