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9.5. Tracking Node Health

A node may be functioning adequately as far as cluster membership is concerned, and yet be "unhealthy" in some respect that makes it an undesirable location for resources. For example, a disk drive may be reporting SMART errors, or the CPU may be highly loaded.
Pacemaker offers a way to automatically move resources off unhealthy nodes.

9.5.1. Node Health Attributes

Pacemaker will treat any node attribute whose name starts with #health as an indicator of node health. Node health attributes may have one of the following values:

Table 9.4. Allowed Values for Node Health Attributes

Value Intended significance
This indicator is unhealthy
This indicator is becoming unhealthy
This indicator is healthy
A numeric score to apply to all resources on this node (0 or positive is healthy, negative is unhealthy)