Amazon S3 Express One Zone is a high-performance storage class from AWS, designed for single-digit millisecond latency and high-throughput workloads. It stores data in a single Availability Zone, making it ideal for applications where speed and low latency are critical, such as real-time analytics, machine learning, and AI inferencing.
Amazon S3 Express One Zone is built for speed and single-AZ, high-performance use cases. Unlike S3 Standard or Intelligent-Tiering, which focus on geographic redundancy and tiered storage, Express One Zone prioritizes low latency and high throughput by colocating data and compute in a single Availability Zone. It delivers up to 10x faster data access and can cut request costs by up to 80% compared to S3 Standard.
Directory buckets are a new bucket type exclusive to Amazon S3 Express One Zone. They provide a hierarchical, folder-like structure for organizing data, making it easier to manage large datasets with millions of objects. Directory buckets support up to 2 million requests per second and are optimized for high-performance workloads.
Amazon S3 Express One Zone is architected to store and replicate data within a single high-performance Availability Zone using specialized hardware. This minimizes network hops, reduces latency, and enables ultra-fast data access. It uses directory buckets for hierarchical data management and a session-based access model for lower request latency.
Amazon S3 Express One Zone supports most key S3 features, including versioning and lifecycle policies. However, it does not provide cross-AZ redundancy, as it is designed to operate within a single Availability Zone for maximum performance.
To set up a directory bucket, open the S3 console and select the Directory Bucket option (available in select regions). Choose your region and Availability Zone, and use a naming pattern like <bucket-base-name>--<region-az-code>--x-s3. You can also create it using the AWS CLI with the appropriate configuration file and region parameters.
You can migrate data from a standard S3 bucket to a directory bucket in Express One Zone using the Import function in the S3 console. Define your source bucket prefix and assign an IAM role with the necessary permissions. AWS will handle the migration as a batch job, which you can monitor in the Batch Operations dashboard.
Amazon S3 Express One Zone is designed for 99.95% availability and comes with an official 99.9% Service Level Agreement (SLA). Redundant infrastructure within the zone ensures resilience without the need for cross-zone replication.
Amazon S3 Express One Zone operates within a single Availability Zone, so it does not provide cross-AZ redundancy. Some settings, such as Object Ownership, Block Public Access, or Encryption, are locked during initial setup but can be managed later via bucket policies. It is available only in select AWS regions.
Amazon S3 Express One Zone uses a session-based access model, granting ReadOnly or ReadWrite access via S3:CreateSession. This approach lowers request latency and provides seamless, automated authentication through the AWS SDK.
Key features include single-digit millisecond request latency, up to 10x faster data access than S3 Standard, directory buckets for hierarchical data management, automatic scaling to millions of requests per second, and seamless integration with AWS services like SageMaker, Redshift, and EMR.
Amazon S3 Express One Zone is natively elastic, handling millions of requests per minute without the need for pre-provisioning or custom tuning. It automatically scales with workload spikes, using the same familiar S3 APIs for easy adoption.
Amazon S3 Express One Zone offers up to 50% lower API request costs compared to S3 Standard and reduces total cost of ownership by minimizing processing overhead and compute time. Its single-AZ design eliminates cross-zone replication costs, making it cost-effective for high-volume workloads.
Amazon S3 Express One Zone integrates with AWS services such as SageMaker, Redshift, EMR, EC2, EKS, and ECS. This allows you to co-locate storage and compute resources for reduced latency and improved performance in AI/ML, analytics, and high-performance computing workloads.
Sedai autonomously manages storage class selection and transitions across your S3 buckets, including Express One Zone. By analyzing data access patterns, Sedai ensures that only hot data remains in Express One Zone, while cold data is moved to more cost-effective tiers. This can cut S3 storage costs by up to 30% and boost productivity by 3X, all without manual intervention. Learn more.
Sedai for S3 is a solution that optimizes Amazon S3 costs by managing Intelligent-Tiering and Archive Access Tier selection. It automates the movement of data between S3 storage classes, achieving up to 30% cost efficiency gain and 3X productivity gain by reducing manual effort in S3 management. Read more.
Sedai offers three modes of operation: Datapilot (provides observability into cloud environments), Copilot (enables one-click optimizations for cloud resources), and Autopilot (fully autonomous execution of optimizations). This flexibility allows users to choose the level of automation that fits their needs.
Sedai integrates with a wide range of tools and platforms, including monitoring and APM tools (Cloudwatch, Prometheus, Datadog, Azure Monitor), Kubernetes autoscalers (HPA/VPA, Karpenter), IaC and CI/CD tools (GitLab, GitHub, Bitbucket, Terraform), ITSM tools (ServiceNow, Jira), notification tools (Slack, Microsoft Teams), and various runbook automation platforms.
Amazon S3 Express One Zone is ideal for workloads that require ultra-low latency and high throughput, such as machine learning and AI training, interactive data analytics, high-frequency log ingestion, real-time streaming, high-performance computing (HPC), and media content processing (e.g., VFX, transcoding).
The main benefits include blazing-fast performance (single-digit millisecond latency), up to 10x faster data access, 50% lower API request costs, effortless scalability, and a smarter data structure with directory buckets. It is purpose-built for speed, simplicity, and cost savings in high-demand environments.
Sedai uses AI to ensure your data only stays in Express One Zone when it’s worth the cost. It automatically moves cold data to lower-cost tiers, keeping performance intact and reducing manual management. This can cut S3 storage costs by up to 30% and boost productivity by 3X. Talk to Sedai for more details.
Customers can expect significant cost savings (up to 30% on S3 storage), improved performance, and increased operational efficiency. Sedai automates storage class transitions, reducing manual effort and enabling engineering teams to focus on higher-value work. Productivity gains of up to 3X have been reported.
Sedai is designed for platform engineers, IT/cloud operations teams, technology leaders, site reliability engineers (SREs), and FinOps professionals in organizations with significant cloud operations. It is especially valuable for companies using AWS S3 for high-performance workloads and seeking to optimize costs and performance.
Industries such as cybersecurity, information technology, financial services, security awareness training, travel and hospitality, healthcare, car rental services, retail and e-commerce, SaaS, and digital commerce have benefited from Sedai's S3 optimization. Notable customers include Palo Alto Networks, HP, Experian, KnowBe4, Expedia, CapitalOne Bank, GSK, and Avis.
KnowBe4, a security awareness training company, achieved up to 50% cost savings in production and saved $1.2 million on their AWS bill using Sedai's autonomous optimization. Read the full case study here.
Sedai offers a plug-and-play implementation that takes just 5 minutes for general use cases and up to 15 minutes for specific scenarios like AWS Lambda. The platform connects securely to your cloud accounts using IAM, with no need for complex installations or agents. Comprehensive onboarding support and detailed documentation are available.
Yes, Sedai is SOC 2 certified, demonstrating adherence to stringent security and compliance standards for data protection. For more details, visit the Sedai Security page.
Comprehensive technical documentation for Sedai is available at docs.sedai.io/get-started. Additional resources, including case studies and datasheets, can be found on the Sedai resources page.
Sedai provides personalized onboarding sessions, a dedicated Customer Success Manager for enterprise customers, detailed documentation, a community Slack channel, and email/phone support. A 30-day free trial is also available for new users to experience the platform risk-free.
Sedai integrates with Infrastructure as Code (IaC), IT Service Management (ITSM), and compliance workflows to ensure all changes are safe, validated, and auditable. Every optimization is constrained, validated, and reversible, supporting enterprise-grade governance and compliance requirements.
Sedai offers 100% autonomous optimization, proactive issue resolution, and application-aware intelligence, setting it apart from competitors that rely on static rules or manual adjustments. Sedai also provides full-stack cloud coverage, release intelligence, and a plug-and-play setup, making it a comprehensive and user-friendly solution for cloud management.
Sedai provides autonomous storage class selection, proactive cost management, and productivity gains by automating routine S3 management tasks. Its AI-driven approach ensures optimal data placement and cost efficiency, which is not commonly found in other solutions.
Benjamin Thomas
CTO
November 20, 2025
Featured
Amazon S3 Express One Zone is Amazon’s newest high-performance storage class, built for single-digit millisecond latency. Learn how it works, key features, benefits, use cases, and how Sedai helps you run it at peak efficiency while keeping costs under control.
You’re under pressure to deliver faster systems and tighter cost control without sacrificing availability or compliance. But traditional storage classes often force you to choose between price, speed, or durability.
Amazon S3 Express One Zone changes the equation. It offers high-throughput, low-latency object storage within a single Availability Zone, designed for fast, frequent access at a lower price.
Let’s break down how it works and where it fits best.
Amazon S3 Express One Zone is a high-performance storage class built for speed, period. It stores data in a single Availability Zone and delivers consistent single-digit millisecond access for your most latency-sensitive and frequently accessed workloads.
This isn’t just a faster version of S3 Standard. It’s a complete rethink.Amazon S3 Express One Zone delivers up to 10x faster data access and cuts request costs by up to 80%. That’s a serious upgrade when you’re handling real-time analytics, machine learning, or AI inferencing where every millisecond counts.
Most S3 classes let you pick a region. Express One Zone lets you go deeper, you can now store data in a specific Availability Zone within that region, and co-locate it with your compute resources for even tighter performance and lower costs.
Here’s what sets it apart:
You don’t have to spin up or manage separate systems just to meet low-latency demands anymore. Express One Zone lets you scale storage up or down automatically while keeping speed and efficiency locked in.
Next, let’s break down how it actually works behind the scenes.
If your workloads are starving for speed but weighed down by traditional storage latency, this is the shift you’ve been waiting for. Amazon S3 Express One Zone rewrites the storage rulebook by delivering blazing-fast, single-AZ object storage built for performance-hungry applications.
All your data lives in one high-performance zone. No replication across multiple AZs, no cross-region wait times. By storing and replicating data locally using specialized hardware, you reduce network hops and speed up processing dramatically.
S3 Express One Zone delivers consistent millisecond-level latency for read and write operations. You can:
Managing massive data shouldn’t be messy. Express One Zone uses directory buckets, an intuitive folder-like structure that makes data easier to sort and retrieve. You get a flat namespace with a hierarchical look and feel, ideal for fast lookups and large-scale AI/ML pipelines.
You can co-locate Amazon S3 Express One Zone with EC2, EKS, ECS, or SageMaker in the same zone. That means:
You can also copy objects from existing buckets using the Import function, a managed, trackable migration option that saves time.
Also read: Cloud Optimization: The Ultimate Guide for Engineers
Coming up next: the features that make Amazon S3 Express One Zone stand out from every other storage class.
Amazon S3 Express One Zone introduces a new bucket type, Directory Buckets, designed for blazing-fast, low-latency workloads. Here's how to get set up without the guesswork.
Once inside the S3 dashboard, look for the Directory Bucket option. It's available in select regions only, so double-check your preferred location.
Pick your region and Availability Zone. You'll need to use a naming pattern that includes both, something like: <bucket-base-name>--<region-az-code>--x-s3.
Heads up: You won’t be able to edit settings like Object Ownership, Block Public Access, or Encryption up front. Those get locked in initially, but you can add a bucket policy later.
Want to create it using the AWS CLI instead? Here's your command:
aws s3api create-bucket --bucket tejas--use1-az5--x-s3 \
--create-bucket-configuration file://s3express-bucket-config.json \
--region us-east-1
If your data is stuck in a standard bucket, don’t worry. AWS makes it easier to shift.
AWS kicks off a batch job behind the scenes to handle the copy. You can watch the process from the Batch Operations dashboard to confirm progress and success.
Amazon S3 Express One Zone isn’t just another storage class. It’s engineered for speed-hungry, high-volume workloads where latency, throughput, and cost control are non-negotiable. If you're managing analytics pipelines, ML training sets, or real-time streaming data, this is built with you in mind.
Amazon S3 Express One Zone delivers single-digit millisecond request latency, not occasionally, but consistently. That means:
You’re not waiting around for data to load or queries to complete. It’s designed to feel instant, because your workloads deserve that kind of responsiveness.
Performance doesn't need to break your budget. Amazon S3 Express One Zone is tuned for cost-effective performance, with:
You get premium speeds without paying a premium price, especially when operating at massive scale.
Worried about scale? You shouldn’t be.
You get the scale you need, automatically, without complex setup or maintenance overhead.
Amazon S3 Express One Zone supports directory buckets, a powerful new bucket type that gives structure to your data:
If you've been hacking around with prefixes and naming conventions, directory buckets feel like a breath of fresh air.
Despite operating in a single Availability Zone, Amazon S3 Express One Zone doesn’t compromise on uptime:
You get dependable storage with predictable availability, and the control to keep it simple and cost-efficient.
Amazon S3 Express One Zone brings a new kind of balance: speed, scale, structure, and savings, all in one storage class. In the next section, we’ll break down the real-world benefits you can expect when adopting it.
Amazon S3 Express One Zone isn’t just another storage class, it’s designed for speed, simplicity, and serious cost savings. If your workloads demand fast, frequent data access, this storage class gives you exactly that, with zero guesswork or provisioning overhead.
Here’s why Amazon S3 Express One Zone stands out:
You get consistent single-digit millisecond request latency, up to 10x faster than S3 Standard. Perfect for apps that can't afford to wait: real-time analytics, high-frequency trading, and ML inference.
Reduced API costs and better compute utilization make it a smart choice for high-request environments. The single-AZ design strips out replication overhead, so you’re paying for performance, not redundancy.
There’s no pre-provisioning, no special setup. Just point your existing S3 apps to the Express One Zone bucket. It auto-scales to millions of requests per minute without breaking a sweat.
This isn’t a “maybe” fit, it’s purpose-built for high-speed data demands:
If you're looking for ultra-low-latency access without the operational drag, Amazon S3 Express One Zone checks all the right boxes.
Suggested read: Top Cloud Cost Optimization Tools in 2025
Let’s now take a closer look at the architecture powering this performance.
Amazon S3 Express One Zone isn’t just a faster storage class, it’s built on a completely new foundation. Its architecture unlocks low-latency performance and high throughput by doing three things very differently.
Unlike traditional S3 classes that span multiple Availability Zones, Express One Zone stays in just one. That makes a big difference.
It allows you to colocate storage and compute in the same AZ, dramatically improving data access speeds. This setup is purpose-built for workloads where every millisecond counts.
Amazon S3 Express One Zone uses directory buckets, a new bucket type built for high-performance workloads needing thousands of TPS.
These buckets support a true hierarchical structure, unlike standard S3’s flat namespace. That means faster access, better scalability, and no prefix bottlenecks.
Key details:
In short, directory buckets turn S3 into a high-speed, low-latency object store built for modern workloads.
Express One Zone also uses a new session-based access model. It grants ReadOnly or ReadWrite access via S3:CreateSession.
The result? Lower request latency with seamless, automated authentication built into the AWS SDK.
Amazon S3 Express One Zone isn’t just fast, it’s built for workloads that demand speed, consistency, and scale. Here’s where it really shines:
Model training needs one thing: fast data. With lower latency and high-throughput, Amazon S3 Express One Zone accelerates access to training datasets, so you can experiment, iterate, and deploy faster.
Cut model development cycles and keep pace with growing AI demands.
Analytics teams can’t afford to wait. Whether you’re scanning petabytes or running ad-hoc queries, Express One Zone offers the lowest-latency object storage to reduce processing times and speed up decision-making.
Insights arrive in seconds, not hours.
High-frequency log ingestion and media streaming workflows benefit from consistent single-digit millisecond performance.
Use features like object append to keep real-time pipelines flowing without bottlenecks.
When compute cycles are expensive, storage delays are costly. Express One Zone supports tightly coupled, compute-heavy jobs like genomics or simulations with high-speed, co-located storage.
You process more, wait less.
From VFX to transcoding, media production timelines are tighter than ever. Express One Zone delivers high throughput at scale, so your rendering jobs can keep up with the pace of creativity.
Perfect for on-demand bursts and parallel workloads.
Each of these workloads demands fast, reliable access to data. That’s exactly where Express One Zone steps in.
Amazon S3 Express One Zone is built for speed. It’s not trying to be everything, it’s built for when speed is everything. Whether you're crunching ML datasets, processing real-time logs, or rendering media under pressure, Express One Zone strips away latency and delivers consistently fast performance.
If you’re constantly wrestling with storage bottlenecks, this is the upgrade that makes sense. You get simplicity, speed, and scalability, without overpaying for what you don’t need.
And if you’re thinking about how to keep S3 costs in check while still maximizing performance, Sedai can help. We autonomously manage storage class selection and transitions across your S3 buckets, cutting storage costs by up to 30% and boosting productivity 3X. Ready to put Express One Zone (and the rest of S3) on autopilot? Talk to us at Sedai.
It’s a high-speed, single-AZ storage class for low-latency, high-throughput workloads. It’s ideal when milliseconds matter and performance needs to scale fast.
Express One Zone is faster and built for single-AZ, high-performance use cases. Unlike tiered options, it prioritizes speed over geographic redundancy.
It’s great for machine learning training, HPC, log analytics, and real-time streaming. These workloads demand rapid data access and minimal I/O lag.
Most key features like versioning and lifecycle policies are supported. However, cross-AZ redundancy is not included—it's single-zone by design.
Sedai ensures your data only stays in Express One Zone when it’s worth the cost. Our AI moves cold data out and keeps performance intact—automatically.
