Re: Rasberry pi - high density

[Randy Carpenter <rcarpen () network1 net>]

----- On May 11, 2015, at 5:36 PM, Peter Baldridge petebaldridge () gmail com wrote:

> > > > Pi dimensions:
> > > >
> > > > 3.37 l (5 front to back)
> > > > 2.21 w (6 wide)
> > > > 0.83 h
> > > > 25 per U (rounding down for Ethernet cable space etc) = 825 pi
>
> You butt up against major power/heat issues here in a single rack, not
> that it's impossible.  From what I could find the rPi2 requires .5A
> min.  The few SSD specs that I could find required something like .8 -
> 1.6A.  Assuming that part of .5A is for driving a SSD, 1A/pi would be
> an optimistic requirement.  So 825-1600 amp in a single rack.  It's
> not crazy to throw 120AMP in a rack for higher density but you would
> need room to put a PDU ever 2 u or so if you were running a 30amp
> circus.

That is .8-1.6A at 5v DC. A far cry from 120V AC. We're talking ~5W versus ~120W each.

Granted there is some conversion overhead, but worst case you are probably talking about 1/20th the power you describe.

-Randy