> ## Documentation Index
> The index for all IBM Cloud docs is at: https://cloud.ibm.com/docs/llms.txt
> Use these files to discover more information as needed.

# Web app cross-region resiliency

The web app cross-region resiliency pattern deploys a 3-tier web application on VPC Virtual Servers that use compute, storage, and network cloud resources as well as other Cloud Services provisioned in multiple availability zones across two regions to protect from region-wide natural disasters or outages.

## Reference

- [References](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-references&format=markdown)

## Reference architectures

- [Web app cross-region resiliency](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-web-app-cross-region&format=markdown)

## Deploying

- [Deploying a VPC VSI cross region architecture](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-vpc-vsi-cross-da&format=markdown)

## Overview

- [Overview](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-overview&format=markdown)

## Planning

- Design considerations
   - [Compute](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-compute-design&format=markdown)
   - [Storage](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-storage-design&format=markdown)
   - [Networking](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-networking-design&format=markdown)
   - [Security](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-security-design&format=markdown)
   - [Resiliency](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-resiliency-design&format=markdown)
   - [Service management](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-service-management-design&format=markdown)
- Architecture decisions
   - [Compute](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-compute-architecture&format=markdown)
   - [Storage](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-storage-architecture&format=markdown)
   - [Networking](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-networking-architecture&format=markdown)
   - [Security](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-security-architecture&format=markdown)
   - [Resiliency](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-resiliency-architecture&format=markdown)
   - [Service management](https://cloud.ibm.com/docs/pattern-vpc-vsi-cross-region-resiliency?topic=pattern-vpc-vsi-cross-region-resiliency-service&format=markdown)