OpenSearch host classes

The host class determines the computing power allocated for each host group with a specific role in the cluster. When you change the host class for a host group in the cluster, the configuration of all hosts previously created in this group changes accordingly. For more information about host groups, see Host roles.

The available storage size does not depend on the host class. For storage limitations, see Quotas and limits.

Available host classesAvailable host classes

Hosts in Managed Service for OpenSearch clusters are deployed on Yandex Compute Cloud VMs. You can create these VMs on any standard platform supported by Compute Cloud. To learn more about the platforms, see Platforms.

The full list of possible host group configurations on each platform is provided below.

The available host configurations for each of the platforms depend on the following factors:

• Database management system.
• Processor type.
• Allocated quota.
• Availability zone.

For example, ru-central1-d does not support local SSD storage if using Intel Cascade Lake.

Configuration types:

• s2, s3, s4a, s4af: Standard configurations with a GB RAM to vCPU ratio of 4:1.
• m2, m3, m4a, m4af: Configurations with an increased GB RAM to vCPU ratio (8:1). These configurations are well suited for clusters with high cache requirements.
• b3: Configuration with a guaranteed vCPU share under 100%. This host class is intended for test workloads. The minimum recommended host configuration for production solutions is two vCPUs with a guaranteed share of 50%.
• c3, c4a, c4af: Configurations with a reduced GB RAM to vCPU ratio (2:1). These configurations may be useful for clusters with higher processor performance requirements.