ServerNet Cluster 6780 Operations Guide (G06.24+, H06.03+)

Troubleshooting and Replacement Procedures
ServerNet Cluster 6780 Operations Guide—525606-002
3-35
Diagnosing Performance Problems
1. Remove the power supply.
2. Wait at least five seconds and then install a replacement power supply in the same
slot. Be sure it is fully seated.
3. Wait for power LED to light. Be sure the fault LED does not light.
Diagnosing Performance Problems
Diagnosis of performance problems in any environment involves multiple steps and
requires extensive knowledge of performance fundamentals and methodologies. If
there are ServerNet Cluster performance issues, you might want to explore these
areas:
•
Throughput: How much traffic is flowing through nodes and between individual
processors?
•
Latency: How well does traffic flow?
•
Problem isolation: What is responsible for the problem?
The Measure performance tool can assist you in collecting data for throughput and
latency analysis. Measure has a SERVERNET entity that tracks all the interprocessor
communication for remote nodes (remote IPC type). This information allows you to
isolate and examine the flow of ServerNet cluster traffic. Another area to investigate, if
you suspect performance degradation, is the health of your Expand lines. For more
information on the SERVERNET, NETLINE, and PROCESS entities and the counters
added specifically for ServerNet cluster support, consult the Measure Reference
Manual.