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Amazon OpenSearch Service now offers a new multi-tier storage

Published
December 17, 2025
https://aws.amazon.com/about-aws/whats-new/2025/12/writeable-warm-tier-opensearch-optimized-instances/

Amazon OpenSearch Service Updates

Amazon OpenSearch Service now offers a new multi-tier storage option powered by OpenSearch Optimized Instances. This new architecture combines Amazon S3 cloud technology with local instance storage to deliver improved durability and performance.

New Features

  • New multi-tier architecture with hot and warm tiers.
  • Hot tier handles frequently accessed data.
  • Warm tier leverages Amazon S3 for cost-effective storage of less frequently accessed data.
  • Warm tier supports write operations, providing greater flexibility for data management.
  • Automate data rotation from hot to warm using Index State Management feature.
  • Use OpenSearch Optimized (OI2) instances (size ‘large’ to ‘8xlarge’) for warm tier deployments.
  • Addressable warm storage up to five times the local cache size.
  • Standard Managed Storage charges apply for warm data.
  • Available on OpenSearch 3.3 and above.

Regional Availability

The new Multi-tier experience on OI2 instance family is now available in the following regions:

  • US East (N. Virginia, Ohio)
  • US West (Oregon)
  • Canada (Central)
  • Asia Pacific (Mumbai, Singapore, Sydney, Tokyo)
  • Europe (Frankfurt, Ireland, London, Spain)

Source: AWS release notes




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