[c-nsp] 6509 power supply question

[A.L.M.Buxey at lboro.ac.uk]

Hi,

> We running different power supplies on one of our 6509 for years,
> no problems with that configuration: 

yes, you just need to be very careful that your blades dont
draw too much power for the one not in use.  eg if you are currently
on a 2500W supply...and that fails , leaving you with only
a 1300W then your blades may take too much for that and thus some
will fail.

eg in the scenario posted...

> Switch#show power
> system power redundancy mode = redundant
> system power total =     2331.00 Watts (55.50 Amps @ 42V)
> system power used =       584.22 Watts (13.91 Amps @ 42V)
> system power available = 1746.78 Watts (41.59 Amps @ 42V)

so, system thinks its got 1746 available.... and 2331 supplied..
however:

> PS   Type               Watts   A @42V Status Status State
> ---- ------------------ ------- ------ ------ ------ -----
> 1    WS-CDC-1300W       1153.32 27.46  OK     OK     on 
> 2    WS-CAC-2500W       2331.00 55.50  OK     OK     on 

that 1300W wont provide enough if the power used was eg 1341.55 Watts
as the system THINKS its got 2500....

alan