Manage Storage on an Atlas Infinite Cluster

Storage Capacity and Cluster Tiers

An Atlas Infinite cluster provides storage for up to 128 TB of logical data. During public preview, Atlas Infinite supports the M10 through M60 cluster tiers in the General cluster class, and the M40 Low-CPU through M60 Low-CPU tiers in the Low-CPU class.

The cluster tier sets the compute available to your Atlas Infinite cluster, not its storage capacity. Every supported cluster tier has access to the same storage capacity, and you can change the tier without changing how much data your Atlas Infinite cluster can hold. To change the cluster tier, see Modify the Cluster Tier.

How Storage Scales

Storage on an Atlas Infinite cluster is shared and independent of the compute nodes, so it behaves differently than storage on an Atlas Core cluster. On an Atlas Infinite cluster, Atlas handles storage as follows:

• Atlas expands storage as your data grows, up to the max storage limit that caps the logical data size of the Atlas Infinite cluster. You don't select a disk size or enable storage auto-scaling.

• Atlas keeps how much data you can store independent of your cluster tier. Adding data within the max storage limit doesn't require you to scale the tier, and scaling the tier doesn't change how much data your Atlas Infinite cluster can hold.

• Atlas scales throughput with the cluster tier. A higher tier gives your Atlas Infinite cluster more throughput and, as a result, more IOPS. No node owns a volume, so you don't select a storage class, set provisioned IOPS, or enable IOPS auto-scaling. For the Atlas Core cluster storage options that these settings apply to, see Customize Atlas Core Cluster Storage.

• Atlas maintains multiple copies of your data in the storage layer for high availability. If you scale the cluster tier or a compute node fails and triggers a failover, Atlas keeps your data in the storage layer instead of copying it to the new compute nodes.

• Atlas meters storage as its own billing dimension, separate from compute and backup. To learn more, see MongoDB Atlas Infinite Cluster Costs.

To learn how the compute and storage layers fit together, see MongoDB Atlas Infinite: Architecture.

Logical Data Size

Atlas Infinite measures the data that an Atlas Infinite cluster holds as logical data size. Logical data size is the uncompressed size of the collections and indexes on your Atlas Infinite cluster. This represents the size of your data, not the physical storage that Atlas provisions to hold it.

Max Storage Limit

To cap your Atlas Infinite cluster below 128 TB of logical data, you can set a max storage limit on the cluster. The max storage limit sets the maximum logical data size of the entire Atlas Infinite cluster. The max storage limit accepts a value from 1 GB to 128 TB. When the logical data size of an Atlas Infinite cluster approaches the max storage limit, Atlas blocks writes on the cluster but continues to serve reads.

To warn you before writes are blocked, Atlas raises an alert by default when the logical data size of an Atlas Infinite cluster exceeds 90% of its max storage limit. To configure this alert, see Atlas Infinite: Storage Space Used % is.

If you don't set a max storage limit on your Atlas Infinite cluster, the cluster can store up to 128 TB of logical data.

To set or view the max storage limit for your Atlas Infinite cluster, select your preferred interface and follow the instructions in the sections below:

 {
   "clusterType": "REPLICASET",
   "databaseEdition": "INFINITE",
   "name": "myCluster",
   "replicationSpecs": [
     {
       "regionConfigs": [
         {
           "autoScaling": {
             "storageConfig": {
               "shardSizeLimitGB": 98304
             }
           },
           "electableSpecs": {
             "instanceSize": "M50",
             "nodeCount": 2
           },
           "priority": 7,
           "providerName": "AWS",
           "regionName": "US_EAST_1"
         }
       ]
     }
   ]
 }