Host classes in Managed Service for ClickHouse®

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 also determines which disk types are available:

• s1, s2, s3, m2, m3, and c3: network-ssd, network-hdd, local-ssd, and network-ssd-nonreplicated.
• b1, b2, b3: network-ssd, network-hdd.

For storage size limitations, see Quotas and limits.

The host class affects the Max server memory usage DBMS setting that limits the amount of RAM available for ClickHouse® to run. For more information, see Memory management.

Available host classesAvailable host classes

Hosts in Managed Service for ClickHouse® clusters are deployed on Yandex Compute Cloud VMs. You can create these VMs on any platforms Compute Cloud supports. See Platforms for a detailed description.

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

Configuration types:

• s1, s2, s3: Standard configurations with 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, b3: 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 50%.

  Note

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

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