cms_config

Cluster Management System (CMS) is a YDB component that enables safe cluster maintenance, for example, updating its version or replacing failed disks without loss of availability. CMS behavior is configured in the cms_config section of the YDB configuration.

Syntax

cms_config:
  tenant_limits:
    disabled_nodes_limit: 2
    disabled_nodes_ratio_limit: 5
  cluster_limits:
    disabled_nodes_limit: 3
    disabled_nodes_ratio_limit: 5
  disable_maintenance: true

Parameters

Parameter	Default value	Description
`tenant_limits.disabled_nodes_limit`	—	Maximum number of database nodes that can be simultaneously unavailable or blocked.
`tenant_limits.disabled_nodes_ratio_limit`	`13`	Maximum percentage of database nodes that can be simultaneously unavailable or blocked.
`cluster_limits.disabled_nodes_limit`	—	Maximum number of cluster nodes that can be simultaneously unavailable or blocked.
`cluster_limits.disabled_nodes_ratio_limit`	`13`	Maximum percentage of cluster nodes that can be simultaneously unavailable.
`disable_maintenance`	`false`	Flag that suspends new cluster maintenance operations.

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