AWS, Cloud Computing

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Amazon S3 Express One Zone Storage Class


Amazon S3 Express One Zone is a high-performance storage class delivering consistent single-digit millisecond data access for your most critical needs. Perfect for AI/ML training, financial modeling, media processing, and more, it offers up to 10x faster performance, scales to millions of requests per minute, and costs 50% less compared to S3 Standard. However, it’s designed for single-Availability Zone deployments and stored in specialized S3 directory buckets.

S3 Express One Zone is stored in a different type of bucket called an S3 directory bucket. This bucket type is optimized for high performance and does not support features like S3 Lifecycle policies.

Key differences between S3 Express One Zone and other S3 storage classes


  • Express One Zone: Up to 10x faster and provides consistent single-digit millisecond latency for frequently accessed data.
  • S3 Standard: Offers good performance but with higher latency and variability.
  • Other S3 storage classes: Lower performance and higher latency suitable for less frequently accessed data.


  • Express One Zone: 50% lower request costs compared to S3 Standard.
  • S3 Standard: Moderate request costs.
  • Other S3 storage classes: Lower request costs than S3 Standard but higher latency.

Durability and Redundancy:

  • Express One Zone: Data is redundantly stored on multiple devices within a single Availability Zone.
  • S3 Standard: Data is replicated across at least three Availability Zones within a Region.
  • Other S3 storage classes: Different levels of redundancy depending on the storage class.


  • Express One Zone: Can handle millions of requests per minute.
  • S3 Standard: Highly scalable.
  • Other S3 storage classes: Scalability varies depending on the storage class.


  • Express One Zone: Designed for single-Availability Zone deployments.
  • S3 Standard: Available across multiple Availability Zones within a Region.
  • Other S3 storage classes: Availability varies depending on the storage class.

Bucket type:

  • Express One Zone: Requires S3 Directory buckets optimized for high performance but lack features like S3 Lifecycle policies.
  • S3 Standard: Supports all S3 bucket types.
  • Other S3 storage classes: Support all S3 bucket types.

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This solution leverages Amazon CloudWatch to monitor Amazon RDS database storage and triggers Amazon SNS notifications when space falls below a defined threshold. Amazon SNS invokes a Lambda function, which dynamically adjusts the database storage by adding a user-specified percentage. This approach prevents repeated storage shortages during the 6-hour optimization period, providing a flexible and responsive scaling solution.

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Use cases:

  • Express One Zone: Ideal for latency-sensitive applications like AI/ML training, financial modeling, media processing, real-time ad placement, and high performance computing.
  • S3 Standard: Good for general purpose storage and applications not requiring single-digit millisecond latency.
  • Other S3 storage classes: Suitable for archiving, backups, and less frequently accessed data.

Key features of S3 Express One Zone:

  • Up to 10x better performance than Amazon S3 Standard storage class.
  • Consistent single-digit millisecond latency for fast data access.
  • Scalability to handle millions of requests per minute.
  • 50% lower request costs compared to S3 Standard.
  • Designed for single-Availability Zone deployments.

Benefits of using S3 Express One Zone:

  • Reduce runtime for data-intensive applications.
  • Improve user experience with faster data access.
  • Optimize costs by storing less frequently accessed data in other storage classes.
  • Simplify infrastructure management with single-Availability Zone deployments.


Amazon S3 Express One Zone is a high-performance storage class for frequently accessed data and latency-sensitive applications. It provides consistent single-digit millisecond data access, making it ideal for workloads like AI/ML training, financial modeling, media processing, and real-time ad placement.

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1. What is the difference between S3 Express One Zone and other S3 storage classes?

ANS: – S3 Express One Zone is designed for high performance and low latency, offering significantly faster data access compared to other storage classes. However, it is only available in a single Availability Zone and requires S3 Directory buckets. Other S3 storage classes offer different performance, durability, and cost trade-offs.

2. What are the use cases for S3 Express One Zone?

ANS: – S3 Express One Zone is ideal for applications that require fast data access and low latency, such as:

  • AI/ML training: Process large datasets quickly with parallel compute resources.
  • Financial modeling: Get real-time data updates for accurate analysis.
  • Media processing: Deliver high-quality content with low latency.
  • Real-time ad placement: Target users with personalized ads in milliseconds.
  • High performance computing: Run complex simulations and analyses efficiently.


Deepika N works as a Research Associate - DevOps and holds a Master's in Computer Applications. She is interested in DevOps and technologies. She helps clients to deploy highly available and secured application in AWS. Her hobbies are singing and painting.



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