HP Surestore 64 Director Switch - Manual (Page 112)

96 Performance View
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 director’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 director 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 director’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 director’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.