Release 10.1A: OpenEdge Getting Started:
Database Essentials

Monitoring system resources (disks, memory, and CPU)

The system resources that require daily monitoring can vary from system to system, but disk fill rate, memory consumption, and CPU utilization are generally resources that must be watched daily. Memory and CPU are less important because if over used, these resources will generally only cause a performance issue. Overusing disk resources can cause an outage.