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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.
Depending on your instance size, Atlas supports the following Azure regions:
| Azure Region | Location | M0 Free Tier Support |
M2/M5 Shared Tier Support |
|---|---|---|---|
centralus |
Iowa (Central US) | ||
eastus |
Virginia (East US) | ||
eastus2 |
Virginia (East US) | check square icon | check square icon |
northcentralus |
Illinois (North Central US) | ||
westus |
California (West US) | ||
southcentralus |
Texas (South Central US) | ||
northeurope |
Ireland (North Europe) | check square icon | |
westeurope |
Netherlands (West Europe) | check square icon | |
francecentral |
Paris (France) | ||
westus2 |
California (West US 2) | ||
canadaeast |
Quebec City (Canada East) | ||
canadacentral |
Toronto (Canada Central) | ||
brazilsouth |
Sao Paulo (Brazil South) | ||
australiaeast |
New South Wales (Australia East) | ||
australiasoutheast |
Victoria (Australia Southeast) | ||
uksouth |
London (UK South) | ||
ukwest |
Cardiff (UK West) | ||
centralindia |
Pune (Central India) | ||
westindia |
Mumbai (West India) | ||
southindia |
Chennai (South India) | ||
eastasia |
Hong Kong (East Asia) | check square icon | |
japaneast |
Tokyo (Japan East) | ||
japanwest |
Osaka (Japan West) | ||
southeastasia |
Singapore (Southeast Asia) | ||
koreacentral |
Seoul (Korea Central) | ||
koreasouth |
Busan (Korea South) |
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]
The following instance sizes are available:
Instance size Maximum disk storage M0512MB M22GB M55GB M20128GB M30256GB M40512GB M502TB M604TB M904TB 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.
Regions with Only Two Fault Domains¶
If the selected Azure region has two fault domains, Atlas clusters are split across the two fault domains. For example, a three node replica set cluster would have two nodes deployed to one zone and the remaining node deployed to the other zone.
2FD clusters have a higher chance of loss of availability in the event of the loss of an zone than 3FD clusters. However, where latency or location are a priority, a region that supports 2FD clusters may be preferred.
| [1] | (1, 2) For detailed documentation on Azure storage options, see High-performance Premium Storage and managed disks for VMs |