[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"lesson-software-architecture-availability-and-resilience-availability-fundamentals-en":3,"cheat-sheet---en":3,"domain-info---en":3,"prev-software-architecture-availability-and-resilience-availability-fundamentals-en":3,"next-software-architecture-availability-and-resilience-availability-fundamentals-en":3,"topic-info-software-architecture-availability-and-resilience-availability-fundamentals-en":4,"course-lesson-metadata-software-architecture-en":19},null,{"meta":5,"body":8},{"title":6,"description":7},"Availability Fundamentals","The nines, SLOs, redundancy, and disaster recovery: availability as arithmetic, not hope.",{"type":9,"value":10,"toc":15},"minimark",[11],[12,13,14],"p",{},"Availability is a number you engineer, not a promise you make. This topic teaches the math of the nines and why chained dependencies multiply downtime, the SLO and error-budget model that turns reliability into a budget, and the redundancy, failover, and disaster recovery designs that buy each extra nine.",{"title":16,"searchDepth":17,"depth":17,"links":18},"",3,[],{"lessons":20,"cheatSheets":21,"mockTestsAvailable":22},[],[],false]