# Configure auto-scaling for Amazon RDS using Snapshots

Use this procedure to enable auto-scaling for Amazon RDS snapshot access nodes so capacity adjusts automatically based on backup and restore demand. Auto-scaling is controlled by a scale configuration client that you associate with a server group, which provisions access nodes as needed in the selected AWS region.

Multi-tenant environments

In multi-tenant environments:

- Service providers can offer auto-scaling by using shared scale profiles.

- Tenants can use a service provider's scale configuration or create their own.

## Prerequisites

- Verify that your AWS Region is supported.

- Subscribe to the required access node AMIs on AWS Marketplace.

For information about supported AWS Regions and AMIs, see Setup for AWS scale configuration.

## Procedure

1. Create a scale configuration client and associate it to a server group.

   The server group must include at least one permanent access node in addition to the scale profile client that is used for replication.

2. Assign the server group as the access node to Amazon RDS snapshot instance.

   To configure a Amazon RDS snapshot instance, see configuring backups for Amazon RDS snapshot.

   Important

   For Amazon RDS snapshot instances using hosted infrastructure, you must update the trust relationship of the CommvaultTenantRole to include the ARN of the CommvaultComputeRole created during AWS scale configuration configuration. This allows the auto-scaled compute resources to assume the required role and perform backup and restore operations in your AWS account.

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