Monitoring Fault Groups
You can monitor fault groups by querying Vertica system tables or by logging in to the Management Console (MC) interface.
Monitor Fault Groups Using System Tables
Use the following system tables to viewinformation about fault groups and cluster vulnerabilities, such as the nodes the cluster cannot lose without the database going down:
- V_CATALOG.FAULT_GROUPS—View the hierarchy of all fault groups in the cluster.
- V_CATALOG.CLUSTER_LAYOUT—Observe the arrangement of the nodes participating in the data business and the fault groups that affect them. Ephemeral nodes do not appear in the cluster layout ring because they hold no data.
Monitoring Fault Groups Using Management Console
An MC administrator can monitor and highlight fault groups of interest by following these steps:
- Click the running database you want to monitor and click Manage in the task bar.
- Open the Fault Group View menu, and select the fault groups you want to view.
- (Optional) Hide nodes that are not in the selected fault group to focus on fault groups of interest.
Nodes assigned to a fault group each have a colored bubble attached to the upper-left corner of the node icon. Each fault group has a unique color.If the number of fault groups exceeds the number of colors available, MC recycles the colors used previously.
Because Vertica supports complex, hierarchical fault groups of different shapes and sizes, MC displays multiple fault group participation as a stack of different-colored bubbles. The higher bubbles represent a lower-tiered fault group, which means that bubble is closer to the parent fault group, not the child or grandchild fault group.
For more information about fault group hierarchy, see High Availability With Fault Groups.