# AOSREL02-BP01 Create Multi-AZ with Standby OpenSearch Service domains
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 Provide high availability and reliability in Amazon OpenSearch Service by creating Multi-AZ with Standby domains, minimizing downtime and simplifying domain management. 

 **Level of risk exposed if this best practice is not established:** High 

 **Desired outcome:** A highly available OpenSearch Service domain is created using Multi-AZ with Standby. 

 **Benefits of establishing this best practice:** 
+  **Improved availability:** Creating Multi-AZ with Standby OpenSearch Service domains can provide improved high availability, minimizing downtime and improving overall system reliability. 
+  **Simplified domain management:** This deployment option simplifies domain management by using multiple Availability Zones and best practices, making it easier to manage and maintain your OpenSearch Service domain. 

## Implementation guidance
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 Multi-AZ with Standby is a deployment option for Amazon OpenSearch Service that offers 99.99% availability, consistent performance for production workloads, and simplified domain management by using multiple Availability Zones and best practices. 

### Implementation steps
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+  Log in to AWS Management Console. 
+  Navigate to the Amazon OpenSearch Service console. 
+  Create a new domain or modify an existing domain: 
  +  For a new domain, choose **Create domain**. 
    +  You can use the Easy create method available under Domain creation method, which creates a new domain with Multi-AZ with Standby enabled by default. 
    +  If you want to have more control over different creation options, then you can choose **Standard create** and select **Domain with standby** in the Deployment option(s) box. 
  +  For an existing domain, select the domain name and choose **Actions**, then select **Edit cluster configuration**. 
  +  For an existing domain, choose **Domain with standby** under Deployment option(s) box. 
+  You will need to have a minimum of three data nodes to use Multi-AZ with Standby. 
+  Proceed with other options. 

## Resources
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+  [AWS announces Multi-AZ with Standby for Amazon OpenSearch Service](https://aws.amazon.com/about-aws/whats-new/2023/05/aws-multi-az-standby-amazon-opensearch-service/) 
+  [Amazon OpenSearch Service Under the Hood: Multi-AZ with Standby](https://aws.amazon.com/blogs/big-data/amazon-opensearch-service-under-the-hood-multi-az-with-standby/) 
+  [Configuring a Multi-AZ domain in Amazon OpenSearch Service](https://docs.aws.amazon.com/opensearch-service/latest/developerguide/managedomains-multiaz.html)