GCF - Global Configuration File

Enhanced Definition

The Global Configuration File (GCF) in the z/OS environment primarily refers to a dataset or member used by **IBM Tivoli Monitoring (ITM)** components, most notably **OMEGAMON XE on z/OS**, to store system-wide or agent -specific configuration parameters. It centralizes the definition of monitoring thresholds, data collection intervals, and operational settings for various monitoring agents across a sysplex.

Key Characteristics

- Centralized Parameter Store: Serves as a single source for configuration parameters that govern the behavior of multiple monitoring agents or components within a z/OS sysplex, ensuring consistency.
- OMEGAMON/ITM Specific: Predominantly associated with IBM OMEGAMON XE products and the broader IBM Tivoli Monitoring framework for mainframe performance and availability monitoring.
- Persistent Storage: Configuration settings defined in the GCF are persistent across system IPLs and agent restarts, ensuring consistent operational parameters without manual re-entry.
- Parameter-Driven: Contains a wide array of parameters, often in a KEYWORD=VALUE format, controlling aspects like data sampling rates, alert thresholds, reporting options, and resource exclusions.
- Dataset Type: Typically implemented as a member within a partitioned dataset (PDS or PDSE) or, less commonly, as a VSAM dataset, accessible by the monitoring agents.
- Dynamic and Static Updates: Some parameters can be updated dynamically while agents are running, while others require an agent or component restart to take effect, necessitating careful planning.