Technical data

Fabric OS Administrator’s Guide 10-23
Publication Number: 53-0000518-09
Inaccurate Information in the System Message Log
10
5. You will need an adapter to run the loopback test for the SFP. Otherwise, run the portLoopBack
test on the marginal port using the loopback mode lb=5. Refer to the Fabric OS Command
Reference Manual for additional information.
6. Check the results of the loopback test and proceed as follows:
• If the loopback test failed, the port is bad. Replace the port blade.
• If the loopback test did not fail, the SFP was bad.
7. Optionally, to rule out cabling issues:
a. Insert a new cable in to the suspected marginal port.
b. Enter the portErrShow command to determine if a problem still exists.
• If the portErrShow output displays a normal number of generated errors, the issue is
solved.
• If the portErrShow output still displays a high number of generated errors, follow the
troubleshooting procedures for the Host or Storage device.
Inaccurate Information in the System Message Log
In rare instances, events gathered by the track change feature can report inaccurate information to the
system message log.
For example, a user enters a correct user name and password, but the login was rejected because the
maximum number of users had been reached. However, when looking at the system message log, the
login was reported as successful.
If the maximum number of switch users has been reached, the switch will still perform correctly in that
it will reject the login of additional users (even if they enter correct user name and password
information).
However, in this limited example, the Track Change feature will report this event inaccurately to the
system message log; it will appear that the login was successful. This scenario only occurs when the
maximum number of users has been reached; otherwise, the login information displayed in the system
message log should reflect reality.
For information regarding enabling and disabling track changes (TC), refer to “Tracking and
Controlling Switch Changes”.
Table 10-7 Loopback Modes
Loopback Mode Description
1 Port Loopback (loopback plugs)
2 External (SERDES) loopback
5 Internal (parallel) loopback (indicates no external equipment)
7 Backend bypass & port loopback
8 Backend bypass & SERDES loopback
9 Backend bypass & internal loopback