Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Dedicated Instances

By default, EC2 instances run on shared tenancy hardware. Dedicated Instances are EC2 instances that run on hardware that's dedicated to a single customer. Dedicated Instances that belong to different Amazon Web Services accounts are physically isolated at a hardware level, even if those accounts are linked to a single payer account. However, Dedicated Instances might share hardware with other instances from the same Amazon Web Services account that are not Dedicated Instances.

A Dedicated Host is also a physical server that's dedicated for your use. With a Dedicated Host, you have visibility and control over how instances are placed on the server. For more information, see Dedicated Hosts.

Dedicated Instance basics

A VPC can have a tenancy of either default or dedicated. By default, your VPCs have default tenancy and instances launched into a default tenancy VPC have default tenancy. To launch Dedicated Instances, do the following:

Supported features

Dedicated Instances support the following features and Amazon service integrations:

Reserved Instances

To guarantee that sufficient capacity is available to launch Dedicated Instances, you can purchase Dedicated Reserved Instances or Capacity Reservations. For more information, see Reserved Instances and On-Demand Capacity Reservations.

When you purchase a Dedicated Reserved Instance, you are purchasing the capacity to launch a Dedicated Instance into a VPC at a much reduced usage fee; the price break in the usage charge applies only if you launch an instance with dedicated tenancy. When you purchase a Reserved Instance with default tenancy, it applies only to a running instance with default tenancy; it does not apply to a running instance with dedicated tenancy.

You can't use the modification process to change the tenancy of a Reserved Instance after you've purchased it. However, you can exchange a Convertible Reserved Instance for a new Convertible Reserved Instance with a different tenancy.

Automatic scaling

You can use Amazon EC2 Auto Scaling to launch Dedicated Instances. For more information, see Launching Auto Scaling Instances in a VPC in the Amazon EC2 Auto Scaling User Guide.

Automatic recovery

You can configure automatic recovery for a Dedicated Instance if it becomes impaired due to an underlying hardware failure or a problem that requires Amazon involvement to repair. For more information, see Recover your instance.

Dedicated Spot Instances

You can run a Dedicated Spot Instance by specifying a tenancy of dedicated when you create a Spot Instance request. For more information, see Specify a tenancy for your Spot Instances.

Burstable performance instances

You can leverage the benefits of running on dedicated tenancy hardware with Burstable performance instances. T3 Dedicated Instances launch in unlimited mode by default, and they provide a baseline level of CPU performance with the ability to burst to a higher CPU level when required by your workload. The T3 baseline performance and ability to burst are governed by CPU credits. Because of the burstable nature of the T3 instance types, we recommend that you monitor how your T3 instances use the CPU resources of the dedicated hardware for the best performance. T3 Dedicated Instances are intended for customers with diverse workloads that display random CPU behavior, but that ideally have average CPU usage at or below the baseline usages. For more information, see Key concepts and definitions for burstable performance instances.

Amazon EC2 has systems in place to identify and correct variability in performance. However, it is still possible to experience short-term variability if you launch multiple T3 Dedicated Instances that have correlated CPU usage patterns. For these more demanding or correlated workloads, we recommend using M5 or M5a Dedicated Instances rather than T3 Dedicated Instances.

Differences between Dedicated Instances and Dedicated Hosts

Dedicated Instances and Dedicated Hosts can both be used to launch Amazon EC2 instances onto physical servers that are dedicated for your use.

There are no performance, security, or physical differences between Dedicated Instances and instances on Dedicated Hosts. However, there are some differences between the two. The following table highlights some of the key differences between Dedicated Instances and Dedicated Hosts:

* Microsoft SQL Server with License Mobility through Software Assurance, and Windows Virtual Desktop Access (VDA) licenses can be used with Dedicated Instance.

For more information about Dedicated Hosts, see Dedicated Hosts.

Dedicated Instances limitations

Keep the following in mind when using Dedicated Instances:

Pricing for Dedicated Instances

Pricing for Dedicated Instances is different from pricing for On-Demand Instances. For more information, see the Amazon EC2 Dedicated Instances product page.