6513 power supply disabled

Unanswered Question
Dec 17th, 2008
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I have a problem with PS2 being disabled in a 6513. The system reports that PS2 has a different capacity from PS1. But I know the two power supplies are the same model, and replacing PS2 does not solve the problem. Has anyone come across anything like this before?


From show system:

PS1-Type PS2-Type

-------------------- --------------------

WS-CAC-4000W-INT WS-CAC-4000W-INT

Modem Baud Backplane-Traffic Peak Peak-Time

------- ----- ----------------- ---- -------------------------

disable 9600 1% 13% Sat Dec 13 2008, 23:17:24

PS1 Capacity: 3830.40 Watts (91.20 Amps @42V)

PS2 Capacity: 3795.12 Watts (90.36 Amps @42V

PS Configuration : PS1 and PS2 in Redundant Configuration. PS2 disabled.

From show ver:

WS-C6513 Software, Version NmpSW: 7.3(2)

Copyright (c) 1995-2002 by Cisco Systems

NMP S/W compiled on Aug 1 2002, 17:57:20


System Bootstrap Version: 7.1(1)


Hardware Version: 1.0 Model: WS-C6513 Serial #: TBM06109172


PS1 Module: WS-CAC-4000W-INT Serial #: SON05200008

PS2 Module: WS-CAC-4000W-INT Serial #: SNI1220BM54


Thanks


Harry


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satish_zanjurne Wed, 12/17/2008 - 05:28
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Hi Harry,


If possible, can you try both these power supplies in different chassis ?


See the result on different chassis.


HTH...rate if helpful..

h.cox Fri, 12/19/2008 - 02:01
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Thanks for the response. I have suggested a swap of PS2s between chassis, so we'll see what happens.


It will be interesting to know if the capacity reported for a PSU comes directly from ther PSU, or is it a massaged figure from the chassis.


Harry


aceschia Tue, 06/09/2009 - 08:00
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Harry


i'm facing the same issue in these days(below there is the output from my customer chassis).


Looking at official documentation, our chassis behave as expected.

With power redundancy enabled, if you have unequal power supplies

the lower-wattage one is disabled by software:


http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008015bfa8.shtml


What I think is happening is just a (silly) weakness in the software: in our cases there is

a very little difference in the supplied watts from the two PSs.

Anyway this difference is enough to force the OS to disable the lower-wattage PS.


I think that differences may normally arise due to different manufacturers, different hardware

revisions and so on.


A common point in our cases are the S/Ns , I have the same combination.

SONxxxxx (PS1) provides 3830.40 , SNIyyyyy (PS2) provides 3795.12

To me, It looks like we're pointing to a time frame large enough to introduce a little

technical differences between the two. (SON sounds newer than SNI)


A solution may be to turn off redundancy with both power being combined.


Anyway I think it will be well worth to open a Service Request to inform TAC that this

behaviour is causing issues to customers and a small difference should be tolerated.

From this perspective, I will update you if possible.


Kind regards

Andrea Ceschia


Exctracted from the show tech


........

........

........

........


PS1 Module: WS-CAC-4000W-INT Serial #: SON05160236

PS2 Module: WS-CAC-4000W-INT Serial #: SNI1050BM1Y


........

........

........

........


PS1-Type PS2-Type

-------------------- --------------------

WS-CAC-4000W-INT WS-CAC-4000W-INT


Modem Baud Backplane-Traffic Peak Peak-Time

------- ----- ----------------- ---- -------------------------

disable 9600 0% 6% Mon Jan 26 2009, 15:34:24


PS1 Capacity: 3830.40 Watts (91.20 Amps @42V)

PS2 Capacity: 3795.12 Watts (90.36 Amps @42V)

PS Configuration : PS1 and PS2 in Redundant Configuration. PS2 disabled.


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