Quick Answer
Service Level Agreement (SLA) in AWS is a commitment made by Amazon Web Services to its customers regarding the availability and reliability of its services. The SLA defines the level of service that customers can expect from AWS and outlines the responsibilities of both parties in maintaining that service level. AWS SLAs typically include guarantees related to uptime, performance, and support response times. These guarantees are important for customers who rely on AWS services to run their applications and businesses, as they provide assurance that AWS will meet certain service levels and take responsibility for any service disruptions. One of the key components of an AWS SLA is the uptime guarantee. This is a commitment by AWS to ensure that its services will be available for a certain percentage of the time, typically measured in terms of "nines" (e.g. 99.9% uptime).
Service Level Agreement (SLA) in AWS is a commitment made by Amazon Web Services to its customers regarding the availability and reliability of its services. The SLA defines the level of service that customers can expect from AWS and outlines the responsibilities of both parties in maintaining that service level.
AWS SLAs typically include guarantees related to uptime, performance, and support response times. These guarantees are important for customers who rely on AWS services to run their applications and businesses, as they provide assurance that AWS will meet certain service levels and take responsibility for any service disruptions.
One of the key components of an AWS SLA is the uptime guarantee. This is a commitment by AWS to ensure that its services will be available for a certain percentage of the time, typically measured in terms of "nines" (e.g. 99.9% uptime). If AWS fails to meet this uptime guarantee, customers may be entitled to service credits or other forms of compensation.
Performance guarantees are another important aspect of an AWS SLA. These guarantees typically relate to the speed and responsiveness of AWS services, such as the latency of network connections or the processing speed of virtual machines. By specifying performance guarantees in the SLA, AWS provides customers with assurance that their applications will perform as expected on the AWS platform.
Support response times are also commonly included in AWS SLAs. These guarantees specify the maximum amount of time that AWS will take to respond to customer support requests, such as technical issues or service outages. By setting clear expectations for support response times, AWS helps customers to plan and prepare for any potential disruptions to their services.
In addition to these specific guarantees, an AWS SLA may also include provisions related to service credits, dispute resolution, and other aspects of the customer-provider relationship. These provisions help to clarify the rights and responsibilities of both parties in the event of a service disruption or other issue.
Overall, an AWS SLA is an important tool for both customers and AWS to ensure that services are delivered reliably and consistently. By defining service levels, responsibilities, and remedies in advance, an SLA helps to prevent misunderstandings and disputes, and provides a framework for resolving any issues that may arise.
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In conclusion, an AWS SLA is a critical component of the customer-provider relationship, providing customers with assurance that AWS will meet certain service levels and take responsibility for any service disruptions. By including guarantees related to uptime, performance, and support response times, an AWS SLA helps to ensure that customers can rely on AWS services to run their applications and businesses effectively.
Understanding AWS SLAs is essential for building reliable cloud infrastructure. Opsio's managed services team monitors SLA compliance, tracks service credits, and ensures your AWS environments meet uptime targets. Learn more about our cloud consulting approach.
Frequently Asked Questions
What are the SLA tiers for AWS services?
AWS SLAs vary by service. Most compute services (EC2, ECS, EKS) target 99.99% monthly uptime when deployed across multiple Availability Zones, 99.9% for single-AZ deployments. Storage services like S3 Standard target 99.9%. Managed databases such as RDS Multi-AZ target 99.95%. Each service has its own published SLA document on aws.amazon.com that defines the exact uptime commitment, measurement methodology and service credit schedule.
Does AWS guarantee 100% uptime?
No. AWS does not offer a 100% SLA on any service. The highest commitment is typically 99.99% (about 4.32 minutes of allowed downtime per month) for multi-AZ deployments of core services. Single-AZ deployments and many managed services fall to 99.9% (about 43.8 minutes per month). Customers must architect for higher availability themselves using multi-region or multi-cloud strategies if they need above 99.99%.
How do AWS SLA service credits work?
If AWS fails to meet a published SLA in a billing month, customers can submit a claim and receive a service credit applied against future bills. Credits are typically 10% of the affected service charges for uptime in the 99.0-99.9% range, 25% for 95.0-99.0%, and 100% for below 95.0%. The customer must file the claim within a specific window (usually 30 days after the month). AWS does not automatically apply credits.
What happens if AWS does not meet its SLA?
Service credits are the sole remedy under the AWS SLA. AWS does not pay direct compensation for downstream business losses, lost revenue or customer-impact damages caused by an outage. This is why many enterprises pair AWS-native SLAs with managed-service-provider (MSP) SLAs that include credits for end-to-end application uptime, not just AWS-platform uptime.
Are all AWS services covered by an SLA?
No. AWS publishes SLAs only for production-grade services. New services in preview, alpha or beta phases typically have no SLA. Some niche services and certain regional combinations also lack formal SLA coverage. Before depending on a service for production workloads, always check the official AWS SLA page for that specific service.
Written By
Head of Innovation at Opsio
Jacob leads innovation at Opsio, specialising in digital transformation, AI, IoT, and cloud-driven solutions that turn complex technology into measurable business value. With nearly 15 years of experience, he works closely with customers to design scalable AI and IoT solutions, streamline delivery processes, and create technology strategies that drive sustainable growth and long-term business impact.
Editorial standards: This article was written by cloud practitioners and peer-reviewed by our engineering team. We update content quarterly for technical accuracy. Opsio maintains editorial independence.