HP StorageWorks MSA 2.8 SAN Switch - Manual (Page 236)

Troubleshooting
236 Fabric OS Procedures Version 3.1.x/4.1.x User Guide
6. Check the results of the loopback test and proceed as follows:
— If the loopback test failed, the port is bad. Replace the port card.
— If the loopback test did not fail, the SFP was bad.
Ruling Out Cabling Issues
7. Begin by performing the steps in “ Isolating the Areas ” on page 235.
By now an SFP problem is ruled out.
8. Insert a new cable into the suspected marginal port.
9. 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, move on to “ Nx_Port (Host or Storage) Issues ” on page 236.
Nx_Port (Host or Storage) Issues
10. Begin performing the steps in “ Isolating the Areas ” on page 235 and “ Ruling
Out Cabling Issues ” on page 236.
By now an SFP problem and a cable problem have been ruled out.
11. Follow the troubleshooting procedures for the host or storage device.