This image shows how the different reliability tiers and underlying business requirements influence the target architecture for a conceptual reference implementation, particularly concerning the number of regional deployments and utilized global technologies. Reliability Tier (Availability SLO)Īvailability SLO is considered by this design methodology to be more than simple uptime, but rather a consistent level of application service relative to a known healthy application state.Īs an initial exercise, readers are advised to select a target reliability tier by determining how much downtime is acceptable? The pursuit of a particular reliability tier will ultimately have a significant bearing on the design path and encompassed design decisions, which will result in a different target architecture. The table below captures permitted error budgets associated with common reliability tiers. This design methodology applies the concept of reliability tiers expressed as availability SLOs to inform required reliability characteristics. For example, a mission-critical workload with a 99.999% availability Service Level Objective (SLO) requires a much higher level of reliability than another less critical workload with an SLO of 99.9%. Reliability is a relative concept and for any workload to be appropriately reliable it should reflect the business requirements surrounding it. Expect that the review considerations and design recommendations provided by this design methodology will yield different design decisions and trade-offs for different application scenarios. Not all mission-critical workloads have the same requirements. This design methodology strives to provide an easy to follow design path to help navigate this complexity and inform design decisions required to produce an optimal target architecture. Constantly aligning with the latest best practices and service roadmaps.Operationalizing utilized services, and.
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