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Cisco Bug: CSCvv58480 - FXOS: Voltage on DC PSU displayed with wrong values from the 'show stats'

Last Modified

Sep 28, 2020

Products (1)

  • Cisco Firepower 9300 Series

Known Affected Releases

2.6(1.157)

Description (partial)

Symptom:
FXOS is suddenly displaying wrong voltage values for the DC PSU from the 'show stats' output:

FPR9K# show fault
Severity  Code     Last Transition Time     ID       Description
--------- -------- ------------------------ -------- -----------
Major     F0389    2020-08-12T04:05:48.646    135410 Power supply 1 in chassis 1 voltage: lower-critical
Major     F0389    2020-08-12T04:04:48.560    135411 Power supply 2 in chassis 1 voltage: lower-critical

Ø  For PS1 :
FPR9K /chassis/psu # show stats

Psu Stats:
    Time Collected: 2020-08-12T10:24:48.059
    Monitored Object: sys/chassis-1/psu-1/stats
    Suspect: No
    Output Power (W): 345.941010
    Ambient Temp (C): 28.000000
    Output Current (A): 29.000000
    Output12v (V): 11.929000
    Output3v3 (V): 3.504000
    Input Voltage (V): 152.000000
    Psu Temp1 (C): N/A
    Psu Temp2 (C): N/A
    Thresholded: 0


Ø  For PSU2:
FPR9K /chassis/psu # show stats

Psu Stats:
    Time Collected: 2020-08-12T10:25:48.144
    Monitored Object: sys/chassis-1/psu-2/stats
    Suspect: No
    Output Power (W): 334.011993
    Ambient Temp (C): 26.000000
    Output Current (A): 28.000000
    Output12v (V): 11.929000
    Output3v3 (V): 3.504000
    Input Voltage (V): 153.000000
    Psu Temp1 (C): N/A
    Psu Temp2 (C): N/A
    Thresholded: 0

- These values aren’t the real, as we have measured 53v DC directly from the data center cables.

Conditions:
FXOS running DC PSU
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