nanog mailing list archives
Re: Rasberry pi - high density
From: Lamar Owen <lowen () pari edu>
Date: Wed, 13 May 2015 16:59:37 -0400
On 05/11/2015 06:50 PM, Brandon Martin wrote:
8kW/rack is something it seems many a typical computing oriented datacenter would be used to dealing with, no? Formfactor within the rack is just a little different which may complicate how you can deliver the cooling - might need unusually forceful forced air or a water/oil type heat exchanger for the oil immersion method being discussed elsewhere in the thread.You still need giant wires and busses to move 800A worth of current. ...
This thread brings me back to 1985, what with talk of full immersion cooling (Fluorinert, anyone?) and hundreds of amps at 5VDC.... reminds me of the Cray-2, which dropped 150-200KW in 6 rack location units of space; 2 for the CPU itself, 2 for space, and 2 for the cooling waterfall [ https://en.wikipedia.org/wiki/File:Cray2.jpeg by referencing floor tile space occupied and taking 16 sq ft (four tiles) as one RLU ]. Each 'stack' of the CPU pulled 2,200A at 5V [source: https://en.wikipedia.org/wiki/Cray-2#History ]. At those currents you use busbar, not wire. Our low-voltage (120/208V three-phase) switchgear here uses 6,000A rated busbar, so it's readily available, if expensive.
Current thread:
- Re: Rasberry pi - high density, (continued)
- Re: Rasberry pi - high density Nick B (May 09)
- Re: [eX-bulk] : Re: Rasberry pi - high density nanog (May 14)
- Re: [eX-bulk] : Re: Rasberry pi - high density charles (May 14)
- Re: Rasberry pi - high density Dave Taht (May 09)
- Re: Rasberry pi - high density Clay Fiske (May 11)
- Re: Rasberry pi - high density Dave Taht (May 11)
- Re: Rasberry pi - high density Peter Baldridge (May 11)
- Re: Rasberry pi - high density Randy Carpenter (May 11)
- Re: Rasberry pi - high density Peter Baldridge (May 11)
- Re: Rasberry pi - high density Brandon Martin (May 11)
- Re: Rasberry pi - high density Lamar Owen (May 13)
- Re: Rasberry pi - high density Dave Taht (May 11)
- Re: Rasberry pi - high density Chris Boyd (May 11)
- Re: Rasberry pi - high density Rafael Possamai (May 11)
- Re: Rasberry pi - high density Hugo Slabbert (May 11)
- Re: Rasberry pi - high density Rafael Possamai (May 11)
- Re: Rasberry pi - high density Joel Maslak (May 11)
- Re: Rasberry pi - high density Rafael Possamai (May 12)