Troubleshooting Tips - HP 316095-B21 - StorageWorks Edge Switch 2/24 User Manual

Some number of invalid transmission words are expected and acceptable. Invalid
transmission words within a frame are used to produce the bit-error threshold link
incident. If one or more invalid transmission words are detected in 12 separate
1.5-second samples within five minutes, a bit-error threshold link incident is
generated.
• CRC errors
A received frame failed a cyclic redundancy check (CRC) validation, indicating
the frame arrived at the switch's port corrupted. Frame corruption may be caused
by device disconnection, an optical transceiver failure at the device, a bad
fiber-optic cable, or a poor cable connection.
• Delimiter errors
The number of times that the switch detected an unrecognized start-of-frame
(SOF), an unrecognized end-of-frame (EOF) delimiter, or an invalid class of
service. This indicates that the frame arrived at the switch's port corrupted. This
corruption can be due to plugging/unplugging the link, bad optics at either end of
the cable, bad cable, or dirty or poor connections. Moving the connection around
or replacing cables can isolate the problem.
• Address ID errors
A received frame had an unavailable or invalid Fibre Channel destination address,
or an invalid Fibre Channel source address. This typically indicates the destination
device is unavailable.
• Frames too short
A received frame exceeded the Fibre Channel frame maximum size or was less
than the Fibre Channel minimum size, indicating the frame arrived at the switch's
port corrupted. Frame corruption may be caused by device disconnection, an
optical transceiver failure at the device, a bad fiber-optic cable, or a poor cable
connection.

Troubleshooting Tips

As a general rule, you should clear all counts after the system is stabilized. When
looking at the Performance View, roughly keep track of the time interval when
errors accumulate to judge the presence and severity of a problem. Also, recognize
that there is a link recovery hierarchy implemented in Fibre Channel to handle
some level of "expected anomalies." In general, only be concerned with error
counts that increment very quickly.
edge switch 2/24 product manager user guide
Monitoring and Managing the Switch
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