User's Manual

Filter Has Excluded All Events 383
No Graph Available for an Event 383
9 PERFORMANCE REPORTING
Overview 385
Key Concepts 385
Automated logging 385
Data resolutions 386
Reporting 386
Components 386
Historical report 386
Link monitors 389
Logging options 390
Database 391
Examples 392
Determining the cause of high errors on a link 392
Predicting demand for bandwidth requirements 392
Web server analysis 393
Useful Information and References 395
RRDTool 395
Mapping file format 395
Devices 395
Links between switches/hubs 395
Links between a switch/hub and an end station/cloud 395
Database file format 396
Database management 398
Key Considerations 399
Troubleshooting 399
Mapping file not updating 399
Changing the logging data directory 399
Missing data within RRD database files 400
Empty historical report states 3Com Network Director cannot monitor
device/link 400
10 RMON
Introduction 403
Key Concepts 404