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Cisco Bug: CSCvt13208 - Unusually low PSU Actual Output values

Last Modified

Feb 26, 2020

Products (1)

  • Cisco MDS 9000 Series Multilayer Switches

Known Affected Releases

6.2(19) 8.4(1)

Description (partial)

Symptom:
In extremely rare cases, it is possible that the output of the command show environment displays unusually low values, for several PSUs, in the "Actual Output" column. The sum of the Actual Draw of various system components will be much higher than the sum of Actual Output of all the PSUs, e.g:

<pre>
`show environment`
Power Supply:
Voltage: 50 Volts
Power                              Actual        Total
Supply    Model                    Output     Capacity    Status
                                 (Watts )     (Watts )
-------  -------------------  -----------  -----------  --------------
1        DS-CAC97-3KW                84 W       3000 W     Ok        
2        DS-CAC97-3KW                70 W       3000 W     Ok        
3        DS-CAC97-3KW                62 W       3000 W     Ok        
4        DS-CAC97-3KW               102 W       3000 W     Ok        
5        DS-CAC97-3KW                79 W       3000 W     Ok        
6        ------------                 0 W          0 W     Absent    
7        DS-CAC97-3KW                 4 W       3000 W     Ok        
8        ------------                 0 W          0 W     Absent    


                                  Actual        Power      
Module    Model                     Draw    Allocated    Status
                                 (Watts )     (Watts )     
-------  -------------------  -----------  -----------  --------------
1        DS-X9448-768K9             392 W        650 W    Powered-Up
2        DS-X9448-768K9             404 W        650 W    Powered-Up
3        DS-X9448-768K9             404 W        650 W    Powered-Up
4        DS-X9448-768K9             404 W        650 W    Powered-Up
5        DS-X97-SF1-K9              103 W        190 W    Powered-Up
6        DS-X97-SF1-K9              124 W        190 W    Powered-Up
7        DS-X9448-768K9             431 W        650 W    Powered-Up
8        DS-X9448-768K9             404 W        650 W    Powered-Up
9        DS-X9448-768K9             418 W        650 W    Powered-Up
10       DS-X9448-768K9             395 W        650 W    Powered-Up
Xb1      DS-X9710-FAB1              125 W        150 W    Powered-Up
Xb2      xbar                       N/A          150 W    Absent
Xb3      DS-X9710-FAB1              130 W        150 W    Powered-Up
Xb4      xbar                       N/A          150 W    Absent
Xb5      DS-X9710-FAB1              127 W        150 W    Powered-Up
Xb6      xbar                       N/A          150 W    Absent
fan1     DS-C9710-FAN                30 W        600 W    Powered-Up
fan2     DS-C9710-FAN                20 W        600 W    Powered-Up
fan3     DS-C9710-FAN                30 W        600 W    Powered-Up

</pre>

Conditions:
This issue is known to affect only DS-CAC97-3KW power supply.
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