Overview

The web app multi-zone resiliency pattern provides a solution design for a 3-tier web architecture deployment that meets high availability requirements for enterprise workloads. It uses cloud platform capabilities to deploy resilient applications on Virtual Servers for VPC. It is not intended for applications that are deployed on Power Virtual Servers (PowerVS) and does not cover application or database high availability design.

This pattern is recommended for applications with 99.9% availability requirements.

• It can support up to 99.99% application availability designs when the application is spread across 3 availability zones.
• It can be used to support business continuity policies or regulatory requirements with country boundaries or geo-data residence constraints.
• It does not support out-of-region disaster recovery. To address disaster recovery policies or business continuity policies with geo or distance compliance requirements, see the Web app cross-region resiliency pattern.

The web app multi-zone resiliency pattern is intended to:

• Accelerate and simplify solution design by providing a standard IBM Cloud deployment architecture reference following the IBM Architecture Framework.

• Provide a prescriptive, end-to-end enterprise-class solution design, with diagrams, component architecture decisions along with rationale for cloud component selection to meet enterprise requirements.

• Ensure that requirements can be met from a performance, system availability, and security perspective.