McDATA 316095-B21 - StorageWorks Edge Switch 2/24 User Manual page 50

Viewing Performance Information
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EFCM Basic User Manual
2-18
• Sync losses—The number of loss-of-synchronizations detected
because an attached device was reset or disconnected from the
port.
• Signal losses—The number of loss-of-signal errors detected
because the attached device was reset or disconnected from the
port.
• Primitive sequence errors—The number of primitive sequence
protocol errors received from an attached device, which indicates
a Fibre Channel link-level protocol violation.
• Discard frames—A received frame could not be routed and was
discarded because the frame timed out due to an insufficient
buffer-to-buffer credit, or the destination device was not logged
into the product.
• Invalid transmission words—The number of invalid
transmission words from an attached device. This indicates that a
frame or primitive sequence arrived at the port corrupted.
• CRC errors—A received frame failed a cyclic redundancy check
(CRC) validation, indicating the frame arrived at the port
corrupted. Frame corruption may be caused by device
disconnection, an optical transceiver failure, 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.