nanog mailing list archives
Re: Rasberry pi - high density
From: Peter Baldridge <petebaldridge () gmail com>
Date: Mon, 11 May 2015 14:36:11 -0700
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's before switching infrastructure. You'll also need airflow since that's not built into the pi. I've seen guys do this with mac minis and they end up needing to push everything back in the rack 4 inches to put 3 or 4 fans with 19in blades on the front door to make the airflow data center ready. So to start, you'd probably need to take a row out of the front of the rack for fans and a row out of the back for power. Cooling isn't really an issue since you can cool anything that you can blow air on[1]. At 825 rpi @ 1Amp each, you'd get about 3000 btu/h (double for the higher power estimate). You'd need need 3-6 tons of avalible cooling capacity without redundancy. I don't know how to do the math for the 'vat of oil scenario'. It's not something I've ever wanted to work with. In the end, I think you end up putting way too much money (power/cooling) into the redundant green board around the CPU.
This feels like it should be a Friday thread. :)
Maybe I'm having a read only may 10-17. 1. Please don't list the things that can't be cooled by blowing air. -- Pete
Current thread:
- Re: Rasberry pi - high density, (continued)
- Re: Rasberry pi - high density Tim Raphael (May 08)
- Re: Rasberry pi - high density Rafael Possamai (May 09)
- Re: Rasberry pi - high density Barry Shein (May 09)
- Re: Rasberry pi - high density Eugeniu Patrascu (May 09)
- 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 Eugeniu Patrascu (May 09)
- Re: Rasberry pi - high density Dave Taht (May 09)
- Re: Rasberry pi - high density Tim Raphael (May 08)
- 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)