# HA for SAP BusinessObjects BI Platform on AWS
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In this guide, we’ll provide an example HA architecture that closely resembles a typical on-premises installation, and we’ll also show how AWS features in combination with SAP BusinessObjects BI Platform installation options support an HA solution that extends beyond a single data center. For the AWS Cloud, this means that the application is highly available within an AWS Region and can survive the failure of a single Availability Zone. The HA solution discussed in this guide includes these design features:
+ SAP BusinessObjects BI Platform nodes are distributed across multiple EC2 instances within a virtual private cloud (VPC). Although Availability Zone failure is a rare occurrence, to protect your application against such scenarios, install each tier of SAP BusinessObjects BI Platform in multiple Availability Zones.
+ Applications are deployed on a web server, following best practices from the [Web Application Deployment Guide for Unix](https://help.sap.com/viewer/product/SAP_BUSINESSOBJECTS_BUSINESS_INTELLIGENCE_PLATFORM/4.2.6/en-US) on the SAP Help Portal.
+ The CMS database is deployed with a failover node that is in a different Availability Zone from the primary node. This guide uses Amazon RDS for MySQL as an example of the SAP BusinessObjects BI Platform CMS database. Amazon RDS is a web service that makes it easier to set up, operate, and scale a relational database in the cloud. It provides cost-efficient, resizable capacity for an industry-standard relational database and manages common database administration tasks. In this guide, we use an Amazon RDS MySQL 5.6 Multi-AZ deployment for the CMS database. See the [AWS documentation](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.MultiAZ.html) for details on how you can configure HA for an Amazon RDS MySQL database in a few steps.
+ Input and output filestores are deployed on a shared file system such as an Amazon EFS file system. Amazon EFS provides simple, scalable, elastic [file storage](https://aws.amazon.com/what-is-cloud-file-storage/) for use with AWS Cloud services and on-premises resources.

**Note**  
Amazon EFS isn’t available yet in all AWS Regions; see a [list of available regions](https://docs.aws.amazon.com/general/latest/gr/rande.html#elasticfilesystem-region). If you’re planning to use a region that doesn’t support Amazon EFS, you can choose a partner network file system (NFS) solution from AWS Marketplace (such as Cloud Volumes ONTAP or SoftNAS) or you can deploy your own solution.