FW V06.XX/HAFM SW V08.02.00 HP StorageWorks Director Element Manager User Guide (AA-RTDUC-TE, July 2004)

Monitoring and managing the Director
103Director Element Manager User Guide
Error Statistics
Port errors indicate that a port is not operating correctly. Use this data to isolate
problems with port and link operations. Error statistics include:
■ Link failures—A link failure was recorded in response to a not operational
sequence (NOS), protocol timeout, or port failure. At the Port Card View, a
yellow triangle displays to indicate a link incident, or a blinking red and
yellow diamond displays to indicate a port failure.
■ Sync losses—A loss of synchronization was detected because the attached
device was reset or disconnected from the port. At the Port Card View, a
yellow triangle displays to indicate a link incident.
■ Signal losses—A loss of signal was detected because the attached device was
reset or disconnected from the port. At the Port Card View, a yellow triangle
displays to indicate a link incident.
■ Primitive sequence errors—An incorrect primitive sequence was received
from the attached device, indicating a Fibre Channel link-level protocol
violation. At the Port Card View, a yellow triangle displays to indicate a link
incident.
■ Discarded frames—A received frame could not be routed and was discarded
because the frame timed out (insufficient buffer-to-buffer credit) or the
destination device was not logged into the director.
■ Invalid transmission words—The number of times that the director detected
invalid transmission words from the attached device. This indicates that a
frame or primitive sequence arrived at the director’s port corrupted. This
corruption can be due to the attached device performing a reset, plugging or
unplugging the link, bad optics at either end of the cable, bad cable, or a dirty
or poor connection. Moving the connection around or replacing cables can
isolate the problem.
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 5 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.