[c-nsp] C6k power reserved for redundant sup?

[Peter Rathlev]

So there I was, just having OIR-inserted an extra WS-X6708-10GE in one
of our existing core switches. But it didn't boot up because we don't
have enough juice. :-( We should of course just install large PSUs
(replacing WS-CAC-3000W) but it'll take some time to order these.

Looking at the output from "show power" I can see that the box reserves
328.44 W for a redundant supervisor. We have no intention of ever
placing an extra supervisor in this box, but I can't see how to avoid
this reservation. Would anybody here know of a way to do that?

It runs SXI1 AIS and the log message when inserting the module was:

005641: Jul  2 16:54:45.578 CEST: %C6KPWR-SP-4-POWERDENIED: insufficient power, module in slot 8 power denied.

The output from "show power":

system power redundancy mode = redundant
system power total =     2771.16 Watts (65.98 Amps @ 42V)
system power used =      2381.40 Watts (56.70 Amps @ 42V)
system power available =  389.76 Watts ( 9.28 Amps @ 42V)
                        Power-Capacity PS-Fan Output Oper
PS   Type               Watts   A @42V Status Status State
---- ------------------ ------- ------ ------ ------ -----
1    WS-CAC-3000W       2771.16 65.98  OK     OK     on 
2    WS-CAC-3000W       2771.16 65.98  OK     OK     on 
                        Pwr-Allocated  Oper
Fan  Type               Watts   A @42V State
---- ------------------ ------- ------ -----
1    WS-C6509-V-E-FAN    252.00  6.00  OK
2    WS-C6509-V-E-FAN    252.00  6.00  OK
                        Pwr-Requested  Pwr-Allocated  Admin Oper
Slot Card-Type          Watts   A @42V Watts   A @42V State State
---- ------------------ ------- ------ ------- ------ ----- -----
1    WS-X6748-GE-TX      325.50  7.75   325.50  7.75  on    on
2    WS-X6748-GE-TX      325.50  7.75   325.50  7.75  on    on
4    WS-X6724-SFP        125.16  2.98   125.16  2.98  on    on
5    WS-SUP720-3BXL      328.44  7.82   328.44  7.82  on    on
6    (Redundant Sup)       -     -      328.44  7.82  -     -
8    WS-X6708-10GE       444.36 10.58     -     -     on    off (FRU-power denied)
9    WS-X6708-10GE       444.36 10.58   444.36 10.58  on    on

Trying to power down module 6 fails:

SomeSwitch(config)#no power enable module 6 
%Error: nonexistent FRU
SomeSwitch(config)#

Thanks a bunch for any pointers. The box is too critical to use combined
powering by the way. 

-- 
Peter