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Cisco Bug: CSCup64117 - SystemMgmtBus test not restarted after fan/PSU hot swap

Last Modified

Feb 15, 2018

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases


Description (partial)

Symptom:The diagnostic test is not restarted after a replacement fan or power supply unit is hot swapped for a failed unit. The SystemMgmtBus diagnostic test shows the new unit as untested.

The following is a sample of a message that indicates the SystemMgmtBus failed for a power supply:

%DEVICE_TEST-2-POWER_SUPPLY_FAIL: Module 6 has failed test SystemMgmtBus 20 times on System Mgmt Bus for chassis Power Supply instance 2 due to error Power supply is found to be bad error number 0x00000002

If the diagmgr logging level is 5(notifications) or lower (numerically) the following message will be seen:

%DIAGMGR-5-HM_STOP: Disabling health monitoring test <SystemMgmtBus> for Module <5>

  switch# show diagnostic result module 6 test 10 detail
        10) SystemMgmtBus .
        Chassis Fan       1  2  3
                          .  .  .
        PS                1  2  3  4  5  6  7  8
                          .  .  .  U  .  .  .  .

Conditions:This issue only applies to Nexus 7000 with Supervisor2, Nexus 7700 with Supervisor3 and MDS 9700 director series switches. It does not occur when the system is booted.
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