Determine Which Links Are Experiencing Significant Errors

You can use the ibdiagnet command to determine which links are experiencing symbol errors and recovery errors by injecting packets.

1. On the management controller, type.

   # ibdiagnet -c 100 -P all=1

   In this instance of the ibdiagnet command, 100 test packets are injected into each link and the -P all=1 option returns all counters that increment during the test.

2. In the output of the ibdiagnet command, search for the symbol_error_counter string.

   That line contains the symbol error count in hexadecimal. The preceding lines identify the node and port with the errors. Symbol errors are minor errors, and if there are relatively few during the diagnostic, they can be monitored.

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   Note - According to the InfiniBand specification 10E-12 BER, the maximum allowable symbol error rate is 120 errors per hour.

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3. Also in the output of the ibdiagnet command, search for the link_error_recovery_counter string.

   That line contains the recovery error count in hexadecimal. The preceding lines identify the node and port with the errors. Recovery errors are major errors and the respective links must be investigated for the cause of the rapid symbol error propagation.

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   Note - Additionally, the ibdiagnet.log file contains the log of the testing.

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Related Information

• Switch Reference, ibdiagnet command

• Find 1x or SDR or DDR Links in the Fabric

• Display Counters for a Node