Scale the OpenSearch cluster

In an OpenSearch cloud database cluster, you can add a new node group and scale an existing node group:

increase the number of nodes in the group — in a group of nodes with the Data role, you can increase the number of nodes up to ten;
change the configuration of the node group — increase vCPU, RAM or disk size. You can select a configuration from another configuration line, but the type of disk used must match and the disk size must be larger.The time to change the configuration depends on the amount of data in the cluster.

Add a node group⁠

You can add a group of nodes with the Dashboard role and a second group of nodes with the Data role.

In the Dashboard, on the top menu, click Products and select Cloud Databases.
Open the Active tab.
Open the Database Cluster page → Settings tab.
From the menu of the node group, select Scale.
In the Cluster block, click Add Node Group.
Optional: change the name of the node group.
Select a node group role — see the OpenSearch Node Groups instructions for more information on roles.
Select a line of configurations.
If you selected a lineup with arbitrary configurations, specify the number of vCPUs, RAM size, and disk size.
If you have selected a lineup with fixed configurations, select a configuration.
Specify the number of nodes in the group.
Optional: to make the nodes of the group accessible from the Internet, connect a public IP address for them:
- If you selected an existing private subnet, enable the Public toggle switch. The private subnet must meet the requirements;
- if you are creating a new private subnet, connect the public IP address after adding the node group.
IP addresses are automatically assigned to all nodes in the group.
Click Save.

Scale the node group when users are least active.

In the Dashboard, on the top menu, click Products and select Cloud Databases.
Open the Active tab.
Open the Database Cluster page → Settings tab.
From the menu of the node group, select Change Configuration.
Scale a group of nodes. You can:
- select the configuration with the larger disk size only;
- increase the number of vCPUs and RAM;
- select a configuration from another line of configurations, but the type of disk used must match and the disk size must be larger;
- to increase the number of nodes.
Click Save.