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Vixel Model 335 Installation & Configuration Guide CHAPTER 4 Technical Reference
56
Small Form-Factor Pluggable (SFP) Issues
Items to check for common SFP-related symptoms are listed below.
Fibre Channel References
The following books give useful information about Fibre Channel.
• Alan F. Benner, Fibre Channel. McGraw-Hill, 1996. ISBN 0-07-005669-2.
•Tom Clark, Designing Storage Area Networks. Addison Wesley Longman, 1999,
ISBN 0-201-61584-3.
• Jan Dedek, Fibre Channel - The Basics. ANCOT Corporation, 1997.
ISBN 0-9637439-3-7.
• Robert Kembel, Arbitrated Loop. Connectivity Solutions, 1996.
ISBN 0-931836-82-4.
• Robert Kembel, A Comprehensive Introduction. Connectivity Solutions, 1998. ISBN
0-931836-84-0.
Problem Recommended Action
SFP installed in one or
more ports but no LEDs lit
Verify power cord is firmly seated into switch and is connected
to a properly earthed receptacle (outlet).
Check the Power LED to ensure switch is turned on.
SFP installed but only
yellow LED is lit
Re-seat the SFP. If the same condition occurs, the SFP is
probably faulty and should be replaced.
SFP installed with both
green and yellow LEDs lit
The switch is not receiving a valid Fibre Channel signal from the
end node (HBA or disk array) or is receiving LIP(F8).
1) Ensure that the device is powered on and operating properly.
2) Unplug the fiber cable from the node and verify that an
optical signal is present on the cable receiver lead.
3) Examine the connectors on the HBA or disk controller for
correct and proper connection. If optical power meter is
available, verify the device is transmitting a signal.
If there is no signal present, the device may require rebooting,
device drivers may need to be reinstalled, or the HBA or disk
controller hardware may require servicing.
If a signal is present on both the cable lead and the end node, the
HBA or disk controller may require service.
SFP installed with only
green LED lit, but devices
are not communicating
The switch is receiving a valid Fibre Channel signal from the end
device (HBA or disk), but no upper level protocols are active.
1) Verify that the proper HBA device drivers are loaded for the
appropriate operating system and that the host has been
configured to recognize attached disk devices.
2) Check the Switch Op LED. If the Switch Op LED is on, the
devices have completed initialization. If the Switch Op LED is
off, the devices were not initialized. Remove all the devices and
add one device at a time to isolate the device responsible for the
failure.
3) Improper initialization could result from a defective or
inoperative adapter card or device. Run adapter diagnostics with
a loopback connector to see if the adapter is working properly.
4) Unplug the fiber cable from the end node and verify that an
optical signal is present on the cable receiver lead. If no signal is
present, the receiver lead of the cable may be bad and the device
may be streaming LIP(F8). Ensure that all cascaded ports are
correctly configured.