Related: "SLA Inversion": https://screamingtiger.blogspot.com/2010/04/release-it-chapter-410-sla-inversion.html https://screamingtiger.blogspot.com/2010/04/rele

Related: "SLA Inversion": https://screamingtiger.blogspot.com/2010/04/release-it-chapter-410-sla-inversion.html https://screamingtiger.blogspot.com/2010/04/release-it-chapt... >"The best SLA you can hope to achieve -- is the worst SLA that any of your dependent services can provide -- DNS, credit card processing, etc. A chain is only as strong as the weakest link. The number of dependent services also affects the SLA calculation. SLA Inversion is when a system must provide high availability -- but depends on systems of lower availability."