Amazon Web Services (AWS)

Cluster Configuration Options

Each Atlas cluster tier comes with a default set of resources. Atlas provides the following resource configuration options:

Custom Storage Size

The size of the server root volume. Atlas clusters deployed onto AWS use general purpose SSDs [1].

Note

RAM Availability

The actual amount of RAM available to each cluster tier might be slightly less than the stated amount, due to memory that the kernel reserves.

The following cluster tiers are available:

Instance Size	Storage Range	Default Storage	Default RAM
M0	.5 GB	.5 GB	Shared
M2	2 GB	2 GB	Shared
M5	5 GB	5 GB	Shared
M10	10 GB to 128 GB	10 GB	2 GB
M20	10 GB to 255 GB	20 GB	4 GB
M30	10 GB to 512 GB	40 GB	8 GB
M40	10 GB to 1 TB	80 GB	16 GB
R40	10 GB to 1 TB	80 GB	16 GB
M40_NVME	380 GB	380 GB	15.25 GB
M50	10 GB to 4 TB	160 GB	32 GB
R50	10 GB to 4 TB	160 GB	32 GB
M50_NVME	760 GB	760 GB	30.5 GB
M60	10 GB to 4 TB	320 GB	64 GB
R60	10 GB to 4 TB	320 GB	64 GB
M60_NVME	1.6 TB	1.6 TB	61 GB
M80	10 GB to 4 TB	750 GB	131 GB
R80	10 GB to 4 TB	750 GB	122 GB
M80_NVME	1.6 TB	1.6 TB	122 GB
M140	10 GB to 4 TB	1 TB	192 GB
M200	10 GB to 4 TB	1.5 TB	256 GB
R200	10 GB to 4 TB	1.5 TB	256 GB
M200_NVME	3.1 TB	3.1 TB	244 GB
M300	10 GB to 4 TB	2 TB	384 GB
R300	10 GB to 4 TB	2 TB	384 GB
R400	10 GB to 4 TB	3 TB	488 GB
M400_NVME	4 TB	4 TB	512 GB
R700	10 GB to 4 TB	4 TB	768 GB

Can use this tier for a multi-cloud cluster.

Unavailable in the AP_SOUTHEAST_2 region.

Note

Cluster Tier & API Naming Conventions

For purposes of management with the Atlas Administration API, cluster tier names that are prepended with R instead of an M (R40 for example) run a low-CPU version of the cluster. When creating or modifying a cluster with the API, be sure to specify your desired cluster class by name with the providerSettings.instanceSizeName attribute.

Important

Multi-Cloud Low-CPU clusters

Low-CPU cluster tiers (R40, R50, R60, etc) are available in multi-cloud cluster configurations as long as the cluster tier is available for all the regions that the cluster uses.

Workloads typically require less than 2TB.

Custom Storage Speed

The input/output operations per second (IOPS) the system can perform.

Each cluster has a default IOPS rate. You can also choose to provision your tier's IOPS rate to meet your particular needs.

The selected cluster tier and custom storage size dictate the maximum IOPS for each storage speed.

Encrypted Storage Volumes

Encrypts the root volume for data at rest inside the volume and all data moving between the volume and the cluster. Atlas uses Amazon EBS encryption.

Amazon Availability Zones

Each AWS region includes a set number of independent availability zones. Availability Zones consist of one or more discrete data centers, each with redundant power, networking and connectivity, housed in separate facilities. For regions that have at least three availability zones (3AZ), Atlas deploys clusters across three availability zones. For regions that only have two availability zones (2AZ), Atlas deploys clusters across two availability zones.

The Atlas Add New Cluster form marks regions that support at least three availability zones as Recommended, as they provide higher availability.

The number of availability zones in a region has no effect on the number of MongoDB nodes Atlas can deploy. MongoDB Atlas clusters are always made of replica sets with a minimum of three MongoDB nodes.

For more information on the number of availability zones in a given region, see the Amazon documentation on global infrastructure.

For more information on AWS regions and availability zones, see the Amazon documentation on using regions and availability zones

Regions with at Least Three Availability Zones

Atlas clusters deployed in regions with at least three availability zones are split across three availability zones. For example, a three node replica set cluster would have one node deployed onto each availability zone.

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3AZ clusters have higher availability compared to 2AZ clusters. However, not all regions support 3AZ clusters.

Regions with Only Two Availability Zones

Atlas clusters deployed in regions with two availability zones are split across the two availability zones. For example, a three node replica set cluster would have two nodes deployed to one availability zone and the remaining node deployed to the other availability zone.

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2AZ clusters have a higher chance of loss of availability in the event of the loss of an availability zone than 3AZ clusters. However, where latency or location are a priority, a region that supports 2AZ clusters may be preferred.

[1]	For detailed documentation on Amazon storage options, see Amazon EBS Volume Types

Dedicated Search Nodes

Stream Processing Instances

Atlas supports deploying Stream Processing Instances in the follow AWS regions:

Integrations

Along with global region support, the following product integrations enable applications running on AWS, such as Amazon EC2, AWS Lambda, and Amazon Elastic Container Service (ECS), to use Atlas instances easily and securely.

More Information

For more information on how to use AWS with Atlas most effectively, review the following best practices, guides, and case studies:

• AWS App Runner: Build Applications and APIs Faster with MongoDB Atlas and AWS App Runner

• AWS Lambda: Best Practices Connecting from AWS Lambda