07-16-2013 12:35 AM - edited 03-07-2019 02:25 PM
Hello everyone!
I have a question about the possible outcome or behaviour of the power managmet during a power supply failure on a 6500 VSS.
Our costumer core switches consisting of two 6509-E in a VSS.
Here is the output of Show Enviroment and Show power switch all commands from the VSS:
------------------ show environment ------------------
environmental alarms:
no alarms
switch 1 backplane:
operating clock count: 2
operating VTT count: 3
operating fan count: 1
switch 2 backplane:
operating clock count: 2
operating VTT count: 3
operating fan count: 1
switch 1 fan-tray 1:
switch 1 fan-tray 1 type: WS-C6509-E-FAN
switch 1 fan-tray 1 mode: High-power
switch 1 fan-tray 1 fan-fail: OK
switch 2 fan-tray 1:
switch 2 fan-tray 1 type: WS-C6509-E-FAN
switch 2 fan-tray 1 mode: High-power
switch 2 fan-tray 1 fan-fail: OK
switch 1 VTT 1:
switch 1 VTT 1 OK: OK
switch 1 VTT 1 outlet temperature: 30C
switch 1 VTT 2:
switch 1 VTT 2 OK: OK
switch 1 VTT 2 outlet temperature: 28C
switch 1 VTT 3:
switch 1 VTT 3 OK: OK
switch 1 VTT 3 outlet temperature: 26C
switch 2 VTT 1:
switch 2 VTT 1 OK: OK
switch 2 VTT 1 outlet temperature: 28C
switch 2 VTT 2:
switch 2 VTT 2 OK: OK
switch 2 VTT 2 outlet temperature: 28C
switch 2 VTT 3:
switch 2 VTT 3 OK: OK
switch 2 VTT 3 outlet temperature: 37C
VTT 10:
VTT 10: not available
VTT 11:
VTT 11: not available
VTT 12:
VTT 12: not available
switch 1 clock 1:
switch 1 clock 1 OK: OK, switch 1 clock 1 clock-inuse: in-use
switch 1 clock 2:
switch 1 clock 2 OK: OK, switch 1 clock 2 clock-inuse: not-in-use
switch 2 clock 1:
switch 2 clock 1 OK: OK, switch 2 clock 1 clock-inuse: in-use
switch 2 clock 2:
switch 2 clock 2 OK: OK, switch 2 clock 2 clock-inuse: not-in-use
switch 1 power-supply 1:
switch 1 power-supply 1 fan-fail: OK
switch 1 power-supply 1 power-input: AC low
switch 1 power-supply 1 power-output-mode: low
switch 1 power-supply 1 power-output-fail: OK
switch 1 power-supply 2:
switch 1 power-supply 2 fan-fail: OK
switch 1 power-supply 2 power-input: AC low
switch 1 power-supply 2 power-output-mode: low
switch 1 power-supply 2 power-output-fail: OK
switch 2 power-supply 1:
switch 2 power-supply 1 fan-fail: OK
switch 2 power-supply 1 power-input: AC high
switch 2 power-supply 1 power-output-mode: high
switch 2 power-supply 1 power-output-fail: OK
switch 2 power-supply 2:
switch 2 power-supply 2 fan-fail: OK
switch 2 power-supply 2 power-input: AC high
switch 2 power-supply 2 power-output-mode: high
switch 2 power-supply 2 power-output-fail: OK
switch 1 module 1:
switch 1 module 1 power-output-fail: OK
switch 1 module 1 outlet temperature: 45C
switch 1 module 1 inlet temperature: 24C
switch 1 module 1 device-1 temperature: 25C
switch 1 module 1 device-2 temperature: 41C
switch 1 module 2:
switch 1 module 2 power-output-fail: OK
switch 1 module 2 outlet temperature: 40C
switch 1 module 2 inlet temperature: 25C
switch 1 module 3:
switch 1 module 3 power-output-fail: OK
switch 1 module 3 outlet temperature: 40C
switch 1 module 3 inlet temperature: 25C
switch 1 module 3 device-1 temperature: 26C
switch 1 module 3 device-2 temperature: 37C
switch 1 module 4:
switch 1 module 4 power-output-fail: OK
switch 1 module 4 outlet temperature: 46C
switch 1 module 4 inlet temperature: 33C
switch 1 module 4 asic-13 temperature: 66C
switch 1 module 4 asic-14 temperature: 68C
switch 1 module 4 EARL outlet temperature: 37C
switch 1 module 4 EARL inlet temperature: 29C
switch 1 module 4 EARL device-2 temperature: 48C
switch 1 module 5:
switch 1 module 5 power-output-fail: OK
switch 1 module 5 outlet temperature: 40C
switch 1 module 5 inlet temperature: 25C
switch 1 module 5 device-1 temperature: 33C
switch 1 module 5 device-2 temperature: 36C
switch 1 module 5 asic-1 temperature: 62C
switch 1 module 5 asic-2 temperature: 42C
switch 1 module 5 asic-4 temperature: 60C
switch 1 module 5 asic-5 temperature: 48C
switch 1 module 5 asic-7 temperature: 48C
switch 1 module 5 asic-8 temperature: 65C
switch 1 module 5 RP outlet temperature: 36C
switch 1 module 5 RP inlet temperature: 32C
switch 1 module 5 RP device-1 temperature: 46C
switch 1 module 5 EARL outlet temperature: 35C
switch 1 module 5 EARL inlet temperature: 27C
switch 1 module 5 EARL device-1 temperature: 45C
switch 1 module 5 EARL device-2 temperature: 46C
switch 2 module 1:
switch 2 module 1 power-output-fail: OK
switch 2 module 1 outlet temperature: 59C
switch 2 module 1 inlet temperature: 29C
switch 2 module 1 device-1 temperature: 29C
switch 2 module 1 device-2 temperature: 53C
switch 2 module 2:
switch 2 module 2 power-output-fail: OK
switch 2 module 2 outlet temperature: 46C
switch 2 module 2 inlet temperature: 27C
switch 2 module 3:
switch 2 module 3 power-output-fail: OK
switch 2 module 3 outlet temperature: 49C
switch 2 module 3 inlet temperature: 28C
switch 2 module 3 device-1 temperature: 29C
switch 2 module 3 device-2 temperature: 44C
switch 2 module 4:
switch 2 module 4 power-output-fail: OK
switch 2 module 4 outlet temperature: 52C
switch 2 module 4 inlet temperature: 35C
switch 2 module 4 asic-13 temperature: 75C
switch 2 module 4 asic-14 temperature: 77C
switch 2 module 4 EARL outlet temperature: 42C
switch 2 module 4 EARL inlet temperature: 30C
switch 2 module 4 EARL device-2 temperature: 50C
switch 2 module 5:
switch 2 module 5 power-output-fail: OK
switch 2 module 5 outlet temperature: 40C
switch 2 module 5 inlet temperature: 27C
switch 2 module 5 device-1 temperature: 33C
switch 2 module 5 device-2 temperature: 37C
switch 2 module 5 asic-1 temperature: 65C
switch 2 module 5 asic-2 temperature: 44C
switch 2 module 5 asic-4 temperature: 61C
switch 2 module 5 asic-5 temperature: 47C
switch 2 module 5 asic-7 temperature: 47C
switch 2 module 5 asic-8 temperature: 70C
switch 2 module 5 RP outlet temperature: 36C
switch 2 module 5 RP inlet temperature: 33C
switch 2 module 5 RP device-1 temperature: 48C
switch 2 module 5 EARL outlet temperature: 36C
switch 2 module 5 EARL inlet temperature: 27C
switch 2 module 5 EARL device-1 temperature: 47C
switch 2 module 5 EARL device-2 temperature: 47C
chassis connector rating: 1302.00 Watts (31.00 Amps @ 42V)
switch 2 module 1
switch 2 module 1 connector rating: 2016.00 Watts (48.00 Amps @ 42V)
switch 2 module 1 power consumption: 254.94 Watts ( 6.07 Amps @ 42V)
switch 2 module 2
switch 2 module 2 connector rating: 2016.00 Watts (48.00 Amps @ 42V)
switch 2 module 2 power consumption: 325.50 Watts ( 7.75 Amps @ 42V)
switch 2 module 3
switch 2 module 3 connector rating: 2016.00 Watts (48.00 Amps @ 42V)
switch 2 module 3 power consumption: 254.94 Watts ( 6.07 Amps @ 42V)
switch 2 module 4
switch 2 module 4 connector rating: 2016.00 Watts (48.00 Amps @ 42V)
switch 2 module 4 power consumption: 588.00 Watts (14.00 Amps @ 42V)
switch 2 module 5
switch 2 module 5 connector rating: 1260.00 Watts (30.00 Amps @ 42V)
switch 2 module 5 power consumption: 435.54 Watts (10.37 Amps @ 42V)
chassis per slot cooling capacity: 94 cfm
ambient temperature: < 55C
switch 1 module 1 cooling requirement: 70 cfm
switch 1 module 2 cooling requirement: 70 cfm
switch 1 module 3 cooling requirement: 70 cfm
switch 1 module 4 cooling requirement: 84 cfm
switch 1 module 5 cooling requirement: 84 cfm
switch 2 module 1 cooling requirement: 70 cfm
switch 2 module 2 cooling requirement: 70 cfm
switch 2 module 3 cooling requirement: 70 cfm
switch 2 module 4 cooling requirement: 84 cfm
switch 2 module 5 cooling requirement: 84 cfm
------------------ show power switch all ------------------
Switch Number: 1
system power redundancy mode = redundant
system power total = 2671.20 Watts (63.60 Amps @ 42V)
system power used = 2504.46 Watts (59.63 Amps @ 42V)
system power available = 166.74 Watts ( 3.97 Amps @ 42V)
Power-Capacity PS-Fan Output Oper
PS Type Watts A @42V Status Status State
---- ------------------ ------- ------ ------ ------ -----
1 WS-CAC-6000W 2671.20 63.60 OK OK on
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 210.00 5.00 OK
Pwr-Requested Pwr-Allocated Admin Oper
Slot Card-Type Watts A @42V Watts A @42V State State
---- ------------------ ------- ------ ------- ------ ----- -----
1 WS-X6748-SFP 254.94 6.07 254.94 6.07 on on
2 WS-X6748-GE-TX 325.50 7.75 325.50 7.75 on on
3 WS-X6748-SFP 254.94 6.07 254.94 6.07 on on
4 WS-X6908-10G 588.00 14.00 588.00 14.00 on on
5 VS-SUP2T-10G 435.54 10.37 435.54 10.37 on on
6 (Redundant Sup) - - 435.54 10.37 - -
Switch Number: 2
system power redundancy mode = redundant
system power total = 2771.16 Watts (65.98 Amps @ 42V)
system power used = 2504.46 Watts (59.63 Amps @ 42V)
system power available = 266.70 Watts ( 6.35 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 210.00 5.00 OK
Pwr-Requested Pwr-Allocated Admin Oper
Slot Card-Type Watts A @42V Watts A @42V State State
---- ------------------ ------- ------ ------- ------ ----- -----
1 WS-X6748-SFP 254.94 6.07 254.94 6.07 on on
2 WS-X6748-GE-TX 325.50 7.75 325.50 7.75 on on
3 WS-X6748-SFP 254.94 6.07 254.94 6.07 on on
4 WS-X6908-10G 588.00 14.00 588.00 14.00 on on
5 VS-SUP2T-10G 435.54 10.37 435.54 10.37 on on
6 (Redundant Sup) - - 435.54 10.37 - -
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 = 2504.46 Watts (59.63 Amps @ 42V)
system auxiliary power used = 0 Watt
Our question is, what is expected to happen if for example, PS1 on SWITCH 1 (WS-CAC-6000W) fails. Is it a possible scenario that under the current configuration, that the other redundant PS2 on SWITCH1 will fail to deliver enough power to the modules on the the switch, causing a failover?
Thanks in advance,
Daniel
07-16-2013 01:04 AM
Daniel,
I have not tested this but yes it should fail to bring most of the modules.
Redundant Mode:
When running in Redundant Mode, each power supply provides approximately 50% of its capacity to the chassis. In the event of a failure, the unaffected power supply will then provide 100% of its capacity and an alert will be generated. As there was enough to power the chassis ahead of time, there is no interruption to service in this configuration. This is also the default and recommended way to configure power supplies
HTH
Regards
Inayath
07-16-2013 01:38 AM
Hello Inayath, thank you for the quick response.
So if I understand correctly, if we look at the power supply on Switch 1:
Switch Number: 1
system power redundancy mode = redundant
system power total = 2671.20 Watts (63.60 Amps @ 42V)
system power used = 2504.46 Watts (59.63 Amps @ 42V)
system power available = 166.74 Watts ( 3.97 Amps @ 42V)
Power-Capacity PS-Fan Output Oper
PS Type Watts A @42V Status Status State
---- ------------------ ------- ------ ------ ------ -----
1 WS-CAC-6000W 2671.20 63.60 OK OK on
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 210.00 5.00 OK
Pwr-Requested Pwr-Allocated Admin Oper
Slot Card-Type Watts A @42V Watts A @42V State State
---- ------------------ ------- ------ ------- ------ ----- -----
1 WS-X6748-SFP 254.94 6.07 254.94 6.07 on on
2 WS-X6748-GE-TX 325.50 7.75 325.50 7.75 on on
3 WS-X6748-SFP 254.94 6.07 254.94 6.07 on on
4 WS-X6908-10G 588.00 14.00 588.00 14.00 on on
5 VS-SUP2T-10G 435.54 10.37 435.54 10.37 on on
6 (Redundant Sup) - - 435.54 10.37 - -
Switch 1 is using 2504.46W from both 6000W supplies, and if one of the them fails, it will still use 2504.46W from on 6000W power supply. Is this correct?
Switch 2 is also consuming the same amount of power like Switch 1 due to the same modules, but using two 3000W PS's. What are the chances for failure in this case?
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