PostgreSQL host classes

The host class determines the computing power allocated for each host in a cluster. When you change the host class for a cluster, all existing hosts change accordingly.

The host class determines the available disk types:

• s1, s2, s3, m2, m3, c3: network-ssd, network-hdd, local-ssd, network-ssd-nonreplicated, network-ssd-io-m3.
• b1, b2: network-ssd, network-hdd.

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 PostgreSQL clusters are deployed on Yandex Compute Cloud VMs. You can create these VMs on any platforms Compute Cloud supports. To learn more about the platforms, see Platforms.

The full list of possible host 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 Intel Broadwell and local SSD storage if Intel Cascade Lake is used.

Configuration types:

• s1, s2, s3: Standard configurations with a 4:1 RAM GB to vCPU ratio.

• m2, m3: Configurations with an increased RAM GB to vCPU ratio (8:1). These configurations may be useful for clusters with higher cache requirements.

• c3: Configurations with a reduced RAM GB to vCPU ratio (2:1). These configurations may be useful for clusters with higher processor performance requirements.

• b1, b2: Configurations with a guaranteed vCPU share under 100%. This host class is intended for test load, while the minimum recommended host configuration for production solutions is two vCPUs with a guaranteed share of 100%.

  Note

  Hosts with a guaranteed vCPU share under 50% cannot be used in multi-host clusters.

Useful linksUseful links

• Learn how to change host class.
• Learn which settings depend on host class and storage size.