Power reservation for redundant Sup despite VSS

Unanswered Question
Jan 27th, 2009

Just converted a pair of 6509's to VSS at the weekend, one of which doesn't quite have enough power for redundant mode - due to the power reservation for the Redundant Supervisor. But redundant supervisors aren't supported under VSS and won't be for a long time I expect.

Is there any way to remove the reservation?

I have this problem too.
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Roberto Salazar Tue, 01/27/2009 - 11:53

Are you seeing the redundancy mode operationally = non-redundant? You will need to have 2 x PS to have this operationally redundant.

For example on switch with a single PS configured for redundant power mode:

#show power switch 1

Switch Number: 1

system power redundancy mode = redundant

system power redundancy operationally = non-redundant

system power total = 2331.00 Watts (55.50 Amps @ 42V)

system power used = 1021.86 Watts (24.33 Amps @ 42V)

system power available = 1309.14 Watts (31.17 Amps @ 42V)

Power-Capacity PS-Fan Output Oper

PS Type Watts A @42V Status Status State

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

1 WS-CAC-2500W 2331.00 55.50 - - off

2 WS-CAC-2500W 2331.00 55.50 OK OK on

This is because it only have one power supply plugged in. Your switch is probably in the same power supply configurations. There is no to remove the reservation.

shamilton-wilkes Tue, 01/27/2009 - 12:04

No I have two PSU's currently operating combined, and without the Sup power reservation I would have enough power to run redundant mode:

sh power

system power redundancy mode = combined

system power total = 4618.32 Watts (109.96 Amps @ 42V)

system power used = 2904.72 Watts (69.16 Amps @ 42V)

system power available = 1713.60 Watts (40.80 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-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 (Redundant Sup) - - 338.10 8.05 - -

7 WS-X6748-GE-TX 325.50 7.75 325.50 7.75 on on

8 WS-X6748-GE-TX 325.50 7.75 325.50 7.75 on on

9 WS-X6724-SFP 125.16 2.98 125.16 2.98 on on

Roberto Salazar Tue, 01/27/2009 - 12:08

The output looks like you have the power redundancy mode in combined.

Try this:

VSS(config)#power red red switch x >> x being the switch you're configuring it on.

VSS(config)#power red combined switch 1

VSS(config)#do show power

VSS(config)#do show power

system power redundancy mode = combined

system power redundancy operationally = non-redundant

system power total = 2331.00 Watts (55.50 Amps @ 42V)

system power used = 1021.86 Watts (24.33 Amps @ 42V)

system power available = 1309.14 Watts (31.17 Amps @ 42V)

Power-Capacity PS-Fan Output Oper

PS Type Watts A @42V Status Status State

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

1 WS-CAC-2500W 2331.00 55.50 - - off

2 WS-CAC-2500W 2331.00 55.50 OK OK on

Pwr-Requested Pwr-Allocated Admin Oper

Slot Card-Type Watts A @42V Watts A @42V State State

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

3 WS-X6704-10GE 295.26 7.03 295.26 7.03 on on

5 VS-S720-10G 363.30 8.65 363.30 8.65 on on

6 (Redundant Sup) - - 363.30 8.65 - -

VSS(config)#power red red switch 1

VSS(config)#do show power

*Jan 27 20:00:53.956: %C6KPWR-SW1_SP-4-PSREDUNDANTMODE: power supplies set to redundant mode.

system power redundancy mode = redundant

system power redundancy operationally = non-redundant

Let me know how it goes.

shamilton-wilkes Tue, 01/27/2009 - 12:10

Yes I do, it won't go into redundant mode because of insufficient power - the only thing that's putting me over the total available from each PSU is the reservation for the Redundant Sup - which can't be added to a VSS configuration anyhow.

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