Connectrix: PowerSupply Shows OK in Show Environment but Fails in Show Module

Summary: PowerSupply shows ok in show environment but fails in show module.

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Symptoms

The power supply shows failed in the show module command: 
Mod Online Diag Status
--- ------------------
1 Pass
2 Pass
3 Pass
4 Pass
5 Fail
6 Pass
7 Pass
8 Pass
9 Pass
10 Pass
But power supply shows ok in show environment: 
Power                              Actual        Total
Supply    Model                    Output     Capacity    Status
                                 (Watts )     (Watts )
-------  -------------------  -----------  -----------  --------------
1        DS-CAC97-3KW               357 W       3000 W     Ok
2        DS-CAC97-3KW               370 W       3000 W     Ok
3        DS-CAC97-3KW               377 W       3000 W     Ok
4        DS-CAC97-3KW               375 W       3000 W     Ok
5        DS-CAC97-3KW               374 W       3000 W     Ok
6        ------------                 0 W          0 W     Absent
7        DS-CAC97-3KW               364 W       3000 W     Ok
8        ------------                 0 W          0 W     Absent
%DEVICE_TEST-2-POWER_SUPPLY_FAIL: Module 5 has failed test SystemMgmtBus 20 times on System Mgmt Bus for chassis Power Supply instance 7 due to error Power supply is found to be bad error number 0x00000002

Cause

This is a hardware issue.

Resolution

This only effects the MDS 9700 switches

The logic inside the power supply that interfaces the system bus is bad. That is why the issue occurs no matter which supplies are active. After 20 failures, the sup disables the tests.

Workaround:
  1. Replace the power supply x    <-- PS showing failed
  2. Restart the diagnostics:
diagnostic start module x test 10    <-- x being active supervisor
The issue is related to Cisco issue CSCup64117 however in the issue, this happens after a replacement.

Affected Products

Connectrix MDS-9710

Products

Connectrix MDS-9710
Article Properties
Article Number: 000064463
Article Type: Solution
Last Modified: 23 Oct 2025
Version:  5
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