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POST runs differently depending on the startup method. A power cycle
(disconnecting from power and reconnecting to power) is considered a cold start. All
other starts from a powered-on state (such as restart or panic) are considered warm
starts.
From a cold start condition, executing a POST runs the long version of ramTest.
From a warm start condition, executing a POST runs a shorter version of ramTest.
The start time with POST varies depending on the startup method.
A hub that is restarted with POST disabled generates the DIAG-POST_SKIPPED
error log message.
Diagnostic commands
All commands are case sensitive and must be entered exactly as shown.
These tests are available from the Telnet session or from the service terminal
connected to the local serial port. In the following list, the test name is followed by
the command used to run the test. “Diagnostic command descriptions” on page 160
provides brief descriptions of the commands.
Hub offline (switchDisable)
Memory test (ramTest)
Port register test (portRegTest)
Central memory test (centralMemoryTest)
CMI conn test (cmiTest)
CAM test (camTest)
Port loopback test (portLoopbackTest)
Cross port test (crossPortTest)
Spin silk test (spinSilk)
SRAM data retention test (sramRetentionTest)
CMem data retention test (cmemRetentionTest)
Hub online (switchEnable)
Simultaneously press Ctrl+C and Enter to quit, continue, view stats, or log test
results. When you press Ctrl+C and Enter , you receive the message:
Diags: (Q)uit, (C)ontinue, (S)tats, (L)og
v
Enter Q to quit the diagnostic test
v
Enter C to continue testing
v
Enter S to view statistics
v
Enter L to save results
See Table 20 on page 113 for a list of the available offline and online tests. See
“Error messages” on page 165 for error message descriptions and the appropriate
service actions.
Attention: All offline diagnostics are disruptive to hub operations. Before
attempting these diagnostic tests or procedures, make sure that the entire hub is
available.
Appendix E. Setup procedures and diagnostics for the Fibre Channel Hub
159