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 switchesThe 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: Replace the power supply x <-- PS showing failedRestart 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.

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