Many different performance problems often affect common
areas of the system. Learn how to research and resolve problems in
common areas, for example, backup and recovery.
When performance problems occur on the system, they often affect
certain areas of the system first. Refer to the following table for
some methods available for researching performance on these system
areas.
| Area |
Description |
Available tools |
| Processor load |
Determine if there are too many jobs on the system or if some
jobs are using a large percentage of processor time. |
- Performance Data Investigator found in IBM® Navigator
for i.
- Work with Active Jobs (WRKACTJOB) command.
- Work with System Activity (WRKSYSACT) command.
- The work management function in IBM Navigator
for i.
- CPU utilization metrics within the IBM Navigator
for i monitors.
|
| Main storage |
Investigate faulting and the wait-to-ineligible transitions. |
- Performance Data Investigator found in IBM Navigator
for i.
- Disk storage metrics within the IBM Navigator
for i monitors.
- Work with System Status (WRKSYSSTS) command.
- The Memory Pools function under Work Management in IBM Navigator
for i.
|
| Disk |
Determine if there are too few arms or if the arms are too
slow. |
- Performance Data Investigator found in IBM Navigator
for i.
- Work with Disk Status (WRKDSKSTS) command.
- Disk arm utilization metrics within the IBM Navigator
for i monitors.
- IBM Performance
Tools for i System
and Component report.
|
| Communications |
Find slow lines, errors on the line, or too many users for
the line. |
- Performance Data Investigator found in IBM Navigator
for i.
- IBM Performance
Tools for i Component
Report.
- LAN utilization metrics within the IBM Navigator
for i monitors.
|
| Software |
Investigate locks and mutual exclusions (mutexes). |
- Performance Data Investigator found in IBM Navigator
for i.
- IBM Performance
Tools for i Locks
report.
- IBM Performance
Tools for i Trace
report.
- Work with Object Locks (WRKOBJLCK) command.
- View details of suspected jobs under Work Management
in IBM Navigator
for i.
- Work with System Activity (WRKSYSACT) command.
- Display Performance Data (DSPPFRDTA) command.
|
| Backup and recovery |
Investigate areas that affect backup and recovery and save
and restore operations. |
- IBM i Performance
Capabilities Reference (Save/Restore Performance chapter).
|