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Synopsis
Instance Configuration Options
GCP Zones

Synopsis¶

Atlas supports deploying clusters onto Google Cloud Platform (GCP). This page provides reference material related to Atlas cluster deployments on GCP.

Atlas supports the following GCP regions:

GCP Region	Location
`us-central1`	Iowa (Central US)
`us-east1`	South Carolina (Eastern US)
`europe-west1`	Belgium (Western Europe)
`asia-east1`	Taiwan (Eastern Asia-Pacific)

Instance Configuration Options¶

Each Atlas instance size 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 GCP use SSD persistent storage [1].

The minimum custom storage size for all instances is 10GB.

For M10 instances, the maximum custom storage size is 3TB.

For M20+ instances, the maximum custom storage size is 4TB.

Workloads typically require less than 2TB.

Atlas configures the following resources automatically and does not allow user modification:

Storage Speed: The input/output operations per second (IOPS) [1] the system can perform. This value is fixed at 30 IOPS per GB for reads and 30 IOPS per GB for writes.

Example

The M30 instance size has a default storage size of 40GB per instance and a max storage speed of 1200 max IOPS. Increasing the storage size to 100GB per instance increases the max storage speed to ( 30 IOPS / GB * 100 GB) or 3000 IOPS.
Encrypted Storage Volumes: GCP storage volumes are always encrypted.

GCP Zones¶

Each GCP region includes a set number of independent zones. Each zone has power, cooling, networking, and control planes that are isolated from other zones. For regions that have at least three zones (3Z), Atlas deploys clusters across three zones. For regions that only have two zones (2Z), Atlas deploys clusters across two zones.

The Atlas Add New Cluster form marks regions that support 3Z clusters as Recommended, as they provide higher availability.

The number of zones in a region has no affect 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 general information on GCP regions and zones, see the Google documentation on regions and zones

Regions with at Least Three Zones¶

If the selected GCP region has at least three zones, Atlas clusters are split across three zones. For example, a three node replica set cluster would have one node deployed onto each zone.

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

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

[1]	(1, 2) For detailed documentation on Google storage options, see Storage Options.

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