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Microsoft Azure¶
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Synopsis¶
Atlas supports deploying clusters onto Microsoft Azure. This page provides reference material related to Atlas cluster deployments on Azure.
Atlas supports the following Azure regions:
| Azure Region | Location |
|---|---|
eastus |
Virginia (East US) |
eastus2 |
Virginia (East US) |
centralus |
Iowa (Central US) |
northcentralus |
Illinois (North Central US) |
southcentralus |
Texas (South Central US) |
westus |
California (West US) |
northeurope |
Ireland (North Europe) |
westeurope |
Netherlands (West Europe) |
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 Azure use premium storage disks. [1] Atlas supports the following storage sizes:
128GB512GB1024GB(1TB)
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 based on the specified custom storage size.
- Encrypted Storage Volumes
- Azure storage volumes are always encrypted.
Azure Fault Domains¶
Each Azure region includes a set number of fault domains. Fault domains consist of a group of virtual machines that share a common power source and network switch. For regions that have at least three fault domains (3FD), Atlas deploys clusters across three fault domains. For regions that only have two fault domains (2FD), Atlas deploys clusters across two fault domains.
The Atlas Add New Cluster form marks regions that support 3FD clusters as Recommended, as they provide higher availability.
The number of fault domains 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 Azure regions and fault domains, see Manage the availability of Windows virtual machines in Azure
Regions with at Least Three Fault Domains¶
If the selected Azure region has at least three fault domains, Atlas clusters are split across three fault domains. For example, a three node replica set cluster would have one node deployed onto each zone.
3FD clusters have higher availability compared to 2FD clusters. However, not all regions support 3FD clusters.
| [1] | (1, 2) For detailed documentation on Azure storage options, see High-performance Premium Storage and managed disks for VMs |