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Amazon Web Services (AWS)

Atlas supports deploying clusters onto Amazon Web Services (AWS). Atlas supports all AWS regions other than those in China and US GovCloud.

Depending on your cluster tier, Atlas supports the following AWS regions. While all of the following regions support M10+ clusters, some regions don't support Free or Shared-Tier clusters. A check mark indicates support for Free or Shared-Tier clusters. The Atlas Region is the corresponding region name used by the Atlas API.

AWS Region
Location
Atlas Region
M0 Free Tier Support
M2/M5 Shared Tier Support
us-east-1
Northern Virginia, USA
US_EAST_1
us-west-2
Oregon, USA
US_WEST_2
ca-central-1
Montreal, QC, Canada
CA_CENTRAL_1
us-east-2
Ohio, USA
US_EAST_2
us-west-1
Northern California, USA
US_WEST_1
sa-east-1
Sao Paulo, Brazil
SA_EAST_1

This page provides reference material related to Atlas cluster deployments on AWS.

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
Default Storage
Default RAM
M2
2 GB
Shared
M5
5 GB
Shared
M10
10 GB
2 GB
M20
20 GB
4 GB
M30
40 GB
8 GB
M40
80 GB
16 GB
R40
80 GB
16 GB
M40_NVME
380 GB
15.25 GB
M50
160 GB
32 GB
R50
160 GB
32 GB
M50_NVME
760 GB
30.5 GB
M60
320 GB
64 GB
R60
320 GB
64 GB
M60_NVME
1.6 TB
61 GB
M80
760 GB
131 GB
R80
750 GB
122 GB
M80_NVME
1.6 TB
122 GB
M100
1 TB
160 GB
M140
1 TB
192 GB
M200
1.5 TB
256 GB
R200
1.5 TB
256 GB
M200_NVME
3.1 TB
244 GB
M300
2 TB
384 GB
R300
2 TB
384 GB
R400
3 TB
488 GB
M400_NVME
4 TB
512 GB
R700
4 TB
768 GB

Can use this tier for a multi-cloud cluster.

Unavailable in the AP_SOUTHEAST_2 region.

Availability limited to the following regions:

  • US_EAST_1
  • US_EAST_2
  • US_WEST_2
  • EU_WEST_1
  • EU_CENTRAL_1
  • AP_NORTHEAST_1
Note
Cluster Tier & API Naming Conventions

For purposes of management with the Atlas 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.

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

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.

A 3-node replica set deployed across a 3-availability zone AWS region.

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

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.

A 3-node replica set deployed across a 2-availability zone AWS region.

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

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