![]() ![]() Service Tiers System Layers Patterns for Resilience & Performance.Local High Availability (Operational Recovery/Component Resilience) and Remote High Availability (Disaster Recovery/Site Resilience) requirements & Guideline for Technical RTO & RPO for each Tier.A Guideline for assigning Risk Tolerance & Acceptance parameters for each Service Tier.Service Tiers corresponding Service Assurance SLAs parameters & Availability Requirements.Service Tiers detailing Criticality, Description, Characteristics and Outage Impacts.This Standard and Architecture will detail: The goal is to eliminate ambiguity and confusion around "what" and "why" a "service tier" is (the definition, description, outage impact & classification), as opposed to "how" it is treated by "who" (the treatment & parameters of each stakeholder). Industry Best Practice values are given to these parameters. The Terms RTO, RPO, HA, DR, and OR are defined and seeded - along with the "SLA" - within the attribute and treatment" parameters" at the appropriate Levels. ![]() The Standard’s Model is based on abstracted definitions of “service” and "service tier" (with their associated "systems") then the model addresses the more concrete corresponding attribute/treatment "parameters" of the "Service (and associated systems) Tier" at each level (view) of the organization based on the viewpoint of the stakeholder at each of these levels. The purpose is to provide a Service Tiering Standard based on the Service’s description, characteristics and outage impact as well as a standard for determining the corresponding treatment parameters of Performance, Availability & Recoverability the corresponding Service Assurance Level or Service Level Agreement (SLA) and the corresponding Risk Tolerance & Acceptance parameters.
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