IBM SAN32M1, Installation And Service Manual

Page: 471 / 626

439 Appendix B: Event code tables
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Event Code: 142
Message: Low BB Credit has been detected on an ISL
Severity: Informational
Explanation: Open Trunking firmware has detected a transmit ISL that has no credits for data transmission for a portion of time
greater than the low transmit BB Credit threshold. This is an indication of congestion in the fabric downstream
from the exit port.
Action: Review the fabric topology using IBM’s switch topology guidelines - This condition may be corrected by adding
parallel ISLs, increasing the link speed of he ISL, or by moving devices to different locations in the fabric. If this
condition is brief and rare, or if the reporting ISL has nearly 100% throughput, this condition can be ignored.
Event Data: Byte 0: Number of the port on which the low BB credit condition was detected.
Byte 1 - 3: Reserved
Distribution: Switch EFC Server Host
Nonvolatile
System
Event Log
System
Error
Indicator
Event Log E-Mail Call-Home Sense Info Link Incident
✔ ✔
Event Code: 143
Message: End of a low BB Credit condition has been detected on an ISL
Severity: Informational
Explanation: Open Trunking firmware has detected that the low BB credit condition on an ISL has been relieved. Credits
allowing data transmission are now available for a greater portion of the time.
Action: A rare, brief episode of low BB credit can sometimes be ignored, but if a low BB credit condition is common or
long-lasting without a very high loading on the reporting ISL, the condition should be handled as described in
Event Code 142.
Event Data: Byte 0: Number of the port that no longer has a low BB credit condition.
Byte 1 - 3: Reserved