Power Consumption in UCS

Hi,
We are running 4 Chassis in our enviroment with firmware 1.4 (3q) and recently we had an issue with one of the PSU (PSU2) in chassis 2 and we got it replaced and after that we are observing that 1 of the PSU in each chassis is showing as "Power Save" (PSU-Details_All_Chassis.JPG) state.
I want to understand that how Power consumptions works in UCS, I have also attached "Power Groups" (Power-Group_Details.jpg) snap shot for the reference.
Want to understand what is "unbounded" & "cap-ok". When will "power save" state PSU will be ON state and does it will go again in "power save" state.
Thanks,
Amit Vyas

Amit,
Again Jeremy is correct. given your illustration grid is the way to go.
The best way to figure out your power requirements however is to use the following tool:
http://www.cisco.com/assets/cdc_content_elements/flash/dataCenter/cisco_ucs_power_calculator/
To answer your question however about the N+1 I have included an explanation below.
Also instituting power capping at the chassis level requires the following:
IOM, CIMC, and BIOS version 1.4 or higher
2 PSUs
A minimum of 3788 AC watts should be set for each chassis. This converts to 3400 watts of DC power, which is the minimum amount of power required to power a fully-populated chassis.
This means that after 1.4 release the minimum with power capping is 2 PSUs. For example previous to 1.4 release a system that was set for N+1 (1+1 for example) would need to have 3 PSUs N+1 (2+1) in releas 1.4 and greater. This is because of the power groups minimum requirement.
If the power is required the +1 should be made available to meet the redundancy requirements. If it is not needed it is turned off / power save.
Please let me know if this helps.

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I have a WS-C6509-E with two WS-CAC-6000W power supplies. I have to determine what is the real power consumption of the whole device but I noticed that there is a mismatch between measurements and show power output so I would very much appreciate if someone could explain why is that so.
I did the following test to try figure out the consumption from the power grid.
Step 1. When both supplies are active, show power gives me the following output:
C6509Test#show power
system power redundancy mode = redundant
system power total =     5771.64 Watts (137.42 Amps @ 42V)
system power used =      2253.72 Watts (53.66 Amps @ 42V)
system power available = 3517.92 Watts (83.76 Amps @ 42V)
                        Power-Capacity PS-Fan Output Oper
PS   Type               Watts   A @42V Status Status State
1    WS-CAC-6000W       5771.64 137.42 OK     OK     on
2    WS-CAC-6000W       5771.64 137.42 OK     OK     on
                        Pwr-Allocated Oper
Fan Type               Watts   A @42V State
1    WS-C6509-E-FAN      150.36 3.58 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
3    WS-X6748-GE-TX      325.50 7.75   325.50 7.75 on    on
4    WS-X6748-GE-TX      325.50 7.75   325.50 7.75 on    on
5    VS-S720-10G         338.10 8.05   338.10 8.05 on    on
6    VS-S720-10G         338.10 8.05   338.10 8.05 on    on
7    WS-X6724-SFP        125.16 2.98   125.16 2.98 on    on
system auxiliary power mode = off
system auxiliary power redundancy operationally = non-redundant
system primary connector power limit =   10920.00 Watts (260.00 Amps @ 42V)
system auxiliary connector power limit = 10500.00 Watts (250.00 Amps @ 42V)
system primary power used =              2253.72 Watts (53.66 Amps @ 42V)
system auxiliary power used =            0 Watt
Step 2. Then I switched off power supply 1:
C6509Test#
*Jan 22 09:29:21.753: %C6KPWR-SP-4-PSOUTPUTDROP: Power supply 1 output has dropp
ed
*Jan 22 09:29:21.769: %C6KPWR-SP-2-PSFAIL: power supply 1 output failed.
*Jan 22 09:29:21.769: %C6KPWR-SP-4-PSREDUNDANTONESUPPLY: in power-redundancy mod
e, system is operating on one power supply.
C6509Test#
C6509Test#show power
system power redundancy mode = redundant
system power redundancy operationally = non-redundant
system power total =     5771.64 Watts (137.42 Amps @ 42V)
system power used =      2253.72 Watts (53.66 Amps @ 42V)
system power available = 3517.92 Watts (83.76 Amps @ 42V)
                        Power-Capacity PS-Fan Output Oper
PS   Type               Watts   A @42V Status Status State
1    WS-CAC-6000W       3780.00 90.00 -      -      off
2    WS-CAC-6000W       5771.64 137.42 OK     OK     on
                        Pwr-Allocated Oper
Fan Type               Watts   A @42V State
1    WS-C6509-E-FAN      150.36 3.58 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
3    WS-X6748-GE-TX      325.50 7.75   325.50 7.75 on    on
4    WS-X6748-GE-TX      325.50 7.75   325.50 7.75 on    on
5    VS-S720-10G         338.10 8.05   338.10 8.05 on    on
6    VS-S720-10G         338.10 8.05   338.10 8.05 on    on
7    WS-X6724-SFP        125.16 2.98   125.16 2.98 on    on
system auxiliary power mode = off
system auxiliary power redundancy operationally = non-redundant
system primary connector power limit =   10920.00 Watts (260.00 Amps @ 42V)
system auxiliary connector power limit = 10500.00 Watts (250.00 Amps @ 42V)
system primary power used =              2253.72 Watts (53.66 Amps @ 42V)
system auxiliary power used =            0 Watt
Step 3. Now I disconnect the power input 1 on running power supply 2 thus leaving the device working on only one out of four power inputs:
C6509Test#
*Jan 22 09:35:50.297: %C6KPWR-SP-4-INPUTCHANGE: Power supply 2 input has changed
. Power capacity adjusted to 2671.20W
*Jan 22 09:35:50.297: %C6KPWR-SP-4-PSOUTPUTDROP: Power supply 2 output has dropp
ed
C6509Test#show power
system power redundancy mode = redundant
system power redundancy operationally = non-redundant
system power total =     2671.20 Watts (63.60 Amps @ 42V)
system power used =      2253.72 Watts (53.66 Amps @ 42V)
system power available = 417.48 Watts ( 9.94 Amps @ 42V)
                        Power-Capacity PS-Fan Output Oper
PS   Type               Watts   A @42V Status Status State
1    WS-CAC-6000W       3780.00 90.00 -      -      off
2    WS-CAC-6000W       2671.20 63.60 OK     OK     on
                        Pwr-Allocated Oper
Fan Type               Watts   A @42V State
1    WS-C6509-E-FAN      150.36 3.58 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
3    WS-X6748-GE-TX      325.50 7.75   325.50 7.75 on    on
4    WS-X6748-GE-TX      325.50 7.75   325.50 7.75 on    on
5    VS-S720-10G         338.10 8.05   338.10 8.05 on    on
6    VS-S720-10G         338.10 8.05   338.10 8.05 on    on
7    WS-X6724-SFP        125.16 2.98   125.16 2.98 on    on
system auxiliary power mode = off
system auxiliary power redundancy operationally = non-redundant
system primary connector power limit =   10920.00 Watts (260.00 Amps @ 42V)
system auxiliary connector power limit = 10500.00 Watts (250.00 Amps @ 42V)
system primary power used =              2253.72 Watts (53.66 Amps @ 42V)
system auxiliary power used =            0 Watt
C6509Test#
*Jan 22 09:37:22.317: %C6KPWR-SP-4-INPUTCHANGE: Power supply 2 input has changed
. Power capacity adjusted to 5771.64W
*Jan 22 09:38:58.523: %C6KPWR-SP-4-PSOK: power supply 1 turned on.
*Jan 22 09:38:58.535: %C6KPWR-SP-4-PSREDUNDANTBOTHSUPPLY: in power-redundancy mo
de, system is operating on both power supplies.
C6509Test#
Step 4. I used the current clamp to measure the current on the remaining power input and it reads 4.9 A.
When I multiply the current with voltage I get
P=4.9*230=1127 W.
So why does the show power output gives system power used = 2253.72 Watts, which is actually double value of measured 1127 W? What am I missing?
Thank you in advance for any help on this,
Marin

marin_otto.
Where are you located and what AC line voltage are you operating on (208 or 230v)? I ran into your post and was wondering if you were operating on 208v which is line to line (two hots) and perhaps you are only measuring current on one line, effectively half the power.
Dave

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