The one thing an organization doesn't want to see is downtime. Application downtime can cause a loss of business and user trust, which makes high availability one of the primary factors while designing the solution architecture. The requirement of application uptime varies from application to application.
If you have an external-facing application with a large user base such as an e-commerce website or social media, then 100% uptime becomes critical. In the case of an internal application (accessed by an employee such as an HR system or internal company), a blog can tolerate some downtime. Achieving high availability is directly associated with cost, so a solution architect always needs to plan for high availability, as per the application requirements, to avoid over-architecting.
To achieve a high availability (HA) architecture, it's better to plan workloads in the isolated physical location of the data center so that if an outage happens in...