[c-nsp] power requirement for sup720 migration
Church, Chuck
cchurch at multimax.com
Wed Nov 15 16:09:43 EST 2006
This is from a lab 6509 (non-E chassis):
test-U00-OR-01#sh power
system power redundancy mode = redundant
system power redundancy operationally = non-redundant
system power total = 2331.00 Watts (55.50 Amps @ 42V)
system power used = 807.66 Watts (19.23 Amps @ 42V)
system power available = 1523.34 Watts (36.27 Amps @ 42V)
Power-Capacity PS-Fan Output Oper
PS Type Watts A @42V Status Status State
---- ------------------ ------- ------ ------ ------ -----
1 WS-CAC-2500W 2331.00 55.50 OK OK on
2 WS-CAC-2500W 1153.32 27.46 - - off
Pwr-Requested Pwr-Allocated Admin Oper
Slot Card-Type Watts A @42V Watts A @42V State State
---- ------------------ ------- ------ ------- ------ ----- -----
2 WS-X6516-GBIC 142.80 3.40 142.80 3.40 on on
3 WS-X6348-RJ-45 100.38 2.39 100.38 2.39 on on
5 WS-SUP720-3B 282.24 6.72 282.24 6.72 on on
6 (Redundant Sup) - - 282.24 6.72 - -
I'm not sure why the fan tray isn't listed like in your output below.
This is from a production 6503 (also non-E):
xxxx1#show power
system power redundancy mode = redundant
system power total = 919.38 Watts (21.89 Amps @ 42V)
system power used = 897.96 Watts (21.38 Amps @ 42V)
system power available = 21.42 Watts ( 0.51 Amps @ 42V)
Power-Capacity PS-Fan Output Oper
PS Type Watts A @42V Status Status State
---- ------------------ ------- ------ ------ ------ -----
1 PWR-950-AC 919.38 21.89 OK OK on
2 PWR-950-AC 919.38 21.89 OK OK on
Pwr-Allocated Oper
Fan Type Watts A @42V State
---- ------------------ ------- ------ -----
1 FAN-MOD-3HS 125.16 2.98 OK
Pwr-Requested Pwr-Allocated Admin Oper
Slot Card-Type Watts A @42V Watts A @42V State State
---- ------------------ ------- ------ ------- ------ ----- -----
1 WS-SUP720-BASE 315.00 7.50 315.00 7.50 on on
2 WS-X6516-GBIC 315.00 7.50 315.00 7.50 on on
3 WS-X6516-GBIC 142.80 3.40 142.80 3.40 on on
Yes, I realize that it's extremely borderline :) Not sure why my
6516-GBIC blades are using different amounts of power either. Might
need to check some logs. I hope half the blade isn't powered off...
Chuck Church
Network Engineer
CCIE #8776, MCNE, MCSE
Multimax, Inc.
Enterprise Network Engineering
Home Office - 864-335-9473
Cell - 864-266-3978
cchurch at multimax.com
-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jay Ford
Sent: Wednesday, November 15, 2006 3:09 PM
To: Gert Doering
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] power requirement for sup720 migration
On Wed, 15 Nov 2006, Gert Doering wrote:
> On Wed, Nov 15, 2006 at 12:02:16PM -0600, Jay Ford wrote:
> > No, that will not work. The sup720 needs a high-speed fan. The
high-speed
> > fan needs at least a 2500 W power supply. Therefore, you can't run
a 6500
> > containing a sup720 on 1300 W power supplies, even in combined
> > (non-redundant) power mode.
>
> Please don't tell that to our 7600s...
>
> Cisco>sh power
> system power redundancy mode = redundant
> system power total = 1370.04 Watts (32.62 Amps @ 42V)
> system power used = 773.64 Watts (18.42 Amps @ 42V)
> system power available = 596.40 Watts (14.20 Amps @ 42V)
> Power-Capacity PS-Fan Output Oper
> PS Type Watts A @42V Status Status State
> ---- ------------------ ------- ------ ------ ------ -----
> 1 PWR-1400-AC 1370.04 32.62 OK OK on
> 2 PWR-1400-AC 1370.04 32.62 OK OK on
> Pwr-Allocated Oper
> Fan Type Watts A @42V State
> ---- ------------------ ------- ------ -----
> 1 FAN-MOD-3HS 125.16 2.98 OK
> Pwr-Requested Pwr-Allocated Admin Oper
> Slot Card-Type Watts A @42V Watts A @42V State State
> ---- ------------------ ------- ------ ------- ------ ----- -----
> 1 WS-SUP720-3B 282.24 6.72 282.24 6.72 on on
> 2 WS-X6408A-GBIC 282.24 6.72 282.24 6.72 on on
> 3 WS-X6408A-GBIC 84.00 2.00 84.00 2.00 on on
>
> (This is a 7603, but e.g. for the 7604, the power requirements for the
> highspeed fan module is even lower, 54 Watts)
>
> Originally, this box came with 900W PSUs. Which is plenty, given that
> the Sup720-3B only needs 300W.
I guess that's a reason to go 7600 instead of 6500. ;^)
> So this whole thread is confusing me. What are you doing to your
modules
> that a 6748 + Sup720 will need 3000W? (PoE maybe?)
I don't need the 2500 or 3000 W for line cards. My hands-on experience
is
that if I put a high-speed fan try in a 6506 or 6509 with a 1300 W
supply the
switch will declare the 1300 W supply as incompatible with the fan try &
the
switch shuts down. The power math never comes into play because the
2500 W
supply seems to be a basic hard requirement of the high-speed fan.
Thus,
I've put at least 2500 W supplies in all our 650[69] chassis which have
sup720 & thus high-speed fans. This is a damn nuisance, but seemed
necessary.
The 760x is apparently different. For all I know the 6509-E might be
different, too. The Cisco power calculator is the right way to answer
these
questions:
http://tools.cisco.com/cpc/launch.jsp
________________________________________________________________________
Jay Ford, Network Engineering Group, Information Technology Services
University of Iowa, Iowa City, IA 52242
email: jay-ford at uiowa.edu, phone: 319-335-5555, fax: 319-335-2951
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