ApsaraDB for MongoDB:Add a shard

Limits

The configuration of the new shard must be greater than or equal to that of the shard with the highest configuration in the current instance.

For example, if the shard with the highest configuration in the instance has 10 GB of storage space, the new shard must have 10 GB or more of storage space.

Billing rules

For more information, see Upgrade/Downgrade fees.

Notes

• If the minor version of your database has expired or is no longer maintained, the system automatically upgrades it to the latest version. This ensures better performance and stability.

• Adding a shard does not affect connections on Mongos nodes. No transient disconnections occur.

• A shard is typically added within 5 minutes. The time required is independent of the number of shards that you add.

• After you add a shard, the balancer may immediately start to rebalance data to resolve imbalances between shards. This can increase the load and resource consumption. Monitor the instance's metrics and resource utilization. Consider setting an appropriate balancer window. For more information, see Manage the MongoDB balancer and Balancing.

Procedure

1. Go to the ApsaraDB for MongoDB sharded cluster instances page. In the upper-left corner, select a resource group and a region. Then, click the ID of the target instance.

2. In the Shard List section, click Add Shard.

3. In the Add Shard panel, select a Specification Category.

   Note

   • This parameter is required only for ApsaraDB for MongoDB sharded cluster instances that use cloud disks.

   • If a category is not available for selection, it is not supported in the current zone.

   • For more information about the categories and specifications of ApsaraDB for MongoDB sharded cluster instances, see Sharded cluster instance specifications.

4. At the bottom of the Shard List, select the number of shards to add, and then click the Add Shard button on the left.

5. Set the parameters for each new shard.

   Parameter	Description
   Specification	Select the specification for the shard.
   Storage	Select the storage space for the shard. Note The storage space of a new shard must be greater than or equal to the largest storage space among the existing shards. For example, if the largest shard in the instance has 20 GB of storage space, you must configure 20 GB or more for the new shard. To decrease the storage space, you can create a new instance. For more information, see Other upgrade and downgrade scenarios. The storage space setting also applies to read-only nodes in the shard. If you add read-only nodes when you add the new shard, all nodes in the shard will have the storage space that you set.
   Read-only	Select the number of read-only nodes to add. The value can be from 0 to 5.

6. Complete the purchase based on the billing method.

   • Pay-as-you-go: Click Pay Now. Then, the system automatically collects the amount in the next hour.

   • Subscription: Click Pay Now. Then, the system automatically collects the amount.

   While the shard is being added, the instance status is Adding Node. When the instance status changes to Running, the shard has been successfully added.

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