yahoo email contact offlist please
Client seeing repeated yahoo DNS resolve failures against multiple domains for email, despite all other recursive resolvers having no issue. Please contact me off list. /kc -- Ken Chase - k...@heavycomputing.ca Toronto Canada Heavy Computing - Clued bandwidth, colocation and managed linux VPS @151 Front St. W.
Re: Rasberry pi - high density
Interesting! Knowing a pi costs approximately $35, then you need approximately $350 to get near an i5.. The smallest and cheapest desktop you can get that would have similar power is the Intel NUC with an i5 that goes for approximately $350. Power consumption of a NUC is about 5x that of the raspberry pi, but the number of ethernet ports required is 10x less. Usually in a datacenter you care much more about power than switch ports, so in this case if the overhead of controlling 10x the number of nodes is worth it, I'd still consider the raspberry pi. Did I miss anything? Just a quick comparison. On Mon, May 11, 2015 at 4:40 PM, Michael Thomas m...@mtcc.com wrote: As it turns out, I've been playing around benchmarking things lately using the tried and true UnixBench suite and here are a few numbers that might put this in some perspective: 1) My new Rapsberry pi (4 cores, arm): 406 2) My home i5-like thing (asus 4 cores, 16gb's from last year): 3857 3) AWS c4.xlarge (4 cores, ~8gb's): 3666 So you'd need to, uh, wedge about 10 pi's to get one half way modern x86. Mike On 5/11/15 1:37 PM, Clay Fiske wrote: On May 8, 2015, at 10:24 PM, char...@thefnf.org 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 Cable management and heat would probably kill this before it ever reached completion, but lol… This feels like it should be a Friday thread. :) If you’re really going for density: - At 0.83 inches high you could go 2x per U (depends on your mounting system and how much space it burns) - I’d expect you could get at least 7 wide if not 8 with the right micro-USB power connector - In most datacenter racks I’ve seen you could get at least 8 deep even with cable breathing room So somewhere between 7x8x2 = 112 and 8x8x2 = 128 per U. And if you get truly creative about how you stack them you could probably beat that without too much effort. This doesn’t solve for cooling, but I think even at these numbers you could probably make it work with nice, tight cabling. -c
Re: Rasberry pi - high density
As it turns out, I've been playing around benchmarking things lately using the tried and true UnixBench suite and here are a few numbers that might put this in some perspective: 1) My new Rapsberry pi (4 cores, arm): 406 2) My home i5-like thing (asus 4 cores, 16gb's from last year): 3857 3) AWS c4.xlarge (4 cores, ~8gb's): 3666 So you'd need to, uh, wedge about 10 pi's to get one half way modern x86. Mike On 5/11/15 1:37 PM, Clay Fiske wrote: On May 8, 2015, at 10:24 PM, char...@thefnf.org 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 Cable management and heat would probably kill this before it ever reached completion, but lol… This feels like it should be a Friday thread. :) If you’re really going for density: - At 0.83 inches high you could go 2x per U (depends on your mounting system and how much space it burns) - I’d expect you could get at least 7 wide if not 8 with the right micro-USB power connector - In most datacenter racks I’ve seen you could get at least 8 deep even with cable breathing room So somewhere between 7x8x2 = 112 and 8x8x2 = 128 per U. And if you get truly creative about how you stack them you could probably beat that without too much effort. This doesn’t solve for cooling, but I think even at these numbers you could probably make it work with nice, tight cabling. -c
Re: BGP offloading (fixing legacy router BGP scalability issues)
Freddy, did you get your test up ? I too am facing the same BGP scalability constraints as you are, and the only real viable solution seems to be filtering. snip I'll probably will setup a small test environment to see if this actually works as expected. Best Regards, Freddy
Re: Rasberry pi - high density
On May 8, 2015, at 10:24 PM, char...@thefnf.org 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 Cable management and heat would probably kill this before it ever reached completion, but lol… This feels like it should be a Friday thread. :) If you’re really going for density: - At 0.83 inches high you could go 2x per U (depends on your mounting system and how much space it burns) - I’d expect you could get at least 7 wide if not 8 with the right micro-USB power connector - In most datacenter racks I’ve seen you could get at least 8 deep even with cable breathing room So somewhere between 7x8x2 = 112 and 8x8x2 = 128 per U. And if you get truly creative about how you stack them you could probably beat that without too much effort. This doesn’t solve for cooling, but I think even at these numbers you could probably make it work with nice, tight cabling. -c
Re: Rasberry pi - high density
On Mon, May 11, 2015 at 1:37 PM, Clay Fiske c...@bloomcounty.org wrote: On May 8, 2015, at 10:24 PM, char...@thefnf.org 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 The parallella board is about the same size and has interesting properties all by itself. In addition to ethernet it also brings out a lot of pins. http://www.adapteva.com/parallella-board/ there are also various and sundry quad core arm boards in the same form factor. Cable management and heat would probably kill this before it ever reached completion, but lol… This feels like it should be a Friday thread. :) If you’re really going for density: - At 0.83 inches high you could go 2x per U (depends on your mounting system and how much space it burns) - I’d expect you could get at least 7 wide if not 8 with the right micro-USB power connector - In most datacenter racks I’ve seen you could get at least 8 deep even with cable breathing room So somewhere between 7x8x2 = 112 and 8x8x2 = 128 per U. And if you get truly creative about how you stack them you could probably beat that without too much effort. This doesn’t solve for cooling, but I think even at these numbers you could probably make it work with nice, tight cabling. Dip them all in a vat of oil. -- Dave Täht Open Networking needs **Open Hardware** https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67
Re: Rasberry pi - high density
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
Re: Rasberry pi - high density
Rather then guessing on power consumption, I measured it. I took a Pi (Model B - but I suspect B+ and the new version is relatively similar in power draw with the same peripherials), hooked it up to a lab power supply, and took a current measurement. My pi has a Sandisk SD card and a Sandisk USB stick plugged into it, so, if anything, it will be a bit high in power draw. I then fired off a tight code loop and a ping -f from another host towards it, to busy up the processor and the network/USB on the Pi. I don't have a way of making the video do anything, so if you were using that, your draw would be up. I also measured idle usage (sitting at a command prompt). Power draw was 2.3W under load, 2.0W at idle. If it was my project, I'd build a backplane board with USB-to-ethernet and ethernet switch chips, along with sockets for Pi compute modules (or something similar). I'd want one power cable and one network cable per backplane board if my requirements allowed it. Stick it all in a nice card cage and you're done. As for performance per watt, I'd be surprised if this beat a modern video processor for the right workload. On Mon, May 11, 2015 at 5:16 PM, Rafael Possamai raf...@gav.ufsc.br wrote: Maybe I messed up the math in my head, my line of thought was one pi is estimated to use 1.2 watts, whereas the nuc is at around 65 watts. 10 pi's = 12 watts. My comparison was 65watts/12watts = 5.4 times more power than 10 pi's put together. This is really a rough estimate because I got the NUC's power consumption from the AC/DC converter that comes with it, which has a maximum output of 65 watts. I could be wrong (up to 5 times) and still the pi would use less power. Now that I think about it, the best way to simplify this is to calculate benchmark points per watt, so rasp pi is at around 406/1.2 which equals 338. The NUC, roughly estimated to be at 3857/65 which equals 60. Let's be very skeptical and say that at maximum consumption the pi is using 5 watts, then 406/5 is around 81. At this point the rasp pi still scores better. Only problem we are comparing ARM to x86 which isn't necessarily fair (i am not an expert in computer architectures) On Mon, May 11, 2015 at 5:24 PM, Hugo Slabbert h...@slabnet.com wrote: Did I miss anything? Just a quick comparison. If those numbers are accurate, then it leans towards the NUC rather than the Pi, no? Perf: 1x i5 NUC = 10x Pi $$: 1x i5 NUC = 10x Pi Power: 1x i5 NUC = 5x Pi So...if a single NUC gives you the performance of 10x Pis at the capital cost of 10x Pis but uses half the power of 10x Pis and only a single Ethernet port, how does the Pi win? -- Hugo On Mon 2015-May-11 17:08:43 -0500, Rafael Possamai raf...@gav.ufsc.br wrote: Interesting! Knowing a pi costs approximately $35, then you need approximately $350 to get near an i5.. The smallest and cheapest desktop you can get that would have similar power is the Intel NUC with an i5 that goes for approximately $350. Power consumption of a NUC is about 5x that of the raspberry pi, but the number of ethernet ports required is 10x less. Usually in a datacenter you care much more about power than switch ports, so in this case if the overhead of controlling 10x the number of nodes is worth it, I'd still consider the raspberry pi. Did I miss anything? Just a quick comparison. On Mon, May 11, 2015 at 4:40 PM, Michael Thomas m...@mtcc.com wrote: As it turns out, I've been playing around benchmarking things lately using the tried and true UnixBench suite and here are a few numbers that might put this in some perspective: 1) My new Rapsberry pi (4 cores, arm): 406 2) My home i5-like thing (asus 4 cores, 16gb's from last year): 3857 3) AWS c4.xlarge (4 cores, ~8gb's): 3666 So you'd need to, uh, wedge about 10 pi's to get one half way modern x86. Mike On 5/11/15 1:37 PM, Clay Fiske wrote: On May 8, 2015, at 10:24 PM, char...@thefnf.org 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 Cable management and heat would probably kill this before it ever reached completion, but lol… This feels like it should be a Friday thread. :) If you’re really going for density: - At 0.83 inches high you could go 2x per U (depends on your mounting system and how much space it burns) - I’d expect you could get at least 7 wide if not 8 with the right micro-USB power connector - In most datacenter racks I’ve seen you could get at least 8 deep even with cable breathing room So somewhere between 7x8x2 = 112 and 8x8x2 = 128 per U. And if you get truly creative about how you stack them you could probably beat that without too much effort. This doesn’t solve for cooling, but I think even at these numbers you could probably make it work with nice, tight cabling.
Re: Rasberry pi - high density
- On May 11, 2015, at 5:36 PM, Peter Baldridge petebaldri...@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
Re: Rasberry pi - high density
On Mon, May 11, 2015 at 3:21 PM, Randy Carpenter rcar...@network1.net wrote: 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. Yeah, missed that. You'd still need fans probably for air flow but the power would be a non issue. -- Pete
Re: Rasberry pi - high density
On Mon, 2015-05-11 at 14:36 -0700, Peter Baldridge wrote: 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. It's pretty interesting what you can do with immersion cooling. I work with it at $DAYJOB. Similar to air cooling, but your coolant flow rates are much lower than air, and you don't need any fans in the systems--The pumps take the place of those. We save a lot of money on the cooling side, since we don't need to compress and expand gases/liquids. We can run with warmish (25-30C) water from cooling towers, and still keep the systems at a target temperature of 35C. --Chris
Re: Rasberry pi - high density
On 05/11/2015 06:21 PM, Randy Carpenter wrote: 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. His estimates seem to consider that it's only 5V, though. He has 825 Pis per rack at ~5-10W each is call it ~8kW on the high end. 8kW is 2.25 tons of refrigeration at first cut, plus any power conversion losses, losses in ducting/chilled water distribution, etc. Calling for at least 3 tons of raw cooling capacity for this rack seems reasonable. 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. It almost seems like you'd have to rig up some sort of 5VDC bus bar system along the sides of the cabinet and tap into it for each shelf or (probably the approach I'd look at first, instead) give up some space on each shelf or so for point-of-load power conversion (120 or 240VAC to 5VDC using industrial brick style supplies or similar) and conventional AC or high voltage (in this context, 48 or 380V is high) DC distribution to each shelf. Getting 800A at 5V to the rack with reasonable losses is going to need humongous wires, too. Looks like NEC calls for something on the order of 800kcmil under rosy circumstances just to move it safely (which, at only 5V, is not necessarily effectively) - yikes that's a big wire. -- Brandon Martin
Re: Rasberry pi - high density
Maybe I messed up the math in my head, my line of thought was one pi is estimated to use 1.2 watts, whereas the nuc is at around 65 watts. 10 pi's = 12 watts. My comparison was 65watts/12watts = 5.4 times more power than 10 pi's put together. This is really a rough estimate because I got the NUC's power consumption from the AC/DC converter that comes with it, which has a maximum output of 65 watts. I could be wrong (up to 5 times) and still the pi would use less power. Now that I think about it, the best way to simplify this is to calculate benchmark points per watt, so rasp pi is at around 406/1.2 which equals 338. The NUC, roughly estimated to be at 3857/65 which equals 60. Let's be very skeptical and say that at maximum consumption the pi is using 5 watts, then 406/5 is around 81. At this point the rasp pi still scores better. Only problem we are comparing ARM to x86 which isn't necessarily fair (i am not an expert in computer architectures) On Mon, May 11, 2015 at 5:24 PM, Hugo Slabbert h...@slabnet.com wrote: Did I miss anything? Just a quick comparison. If those numbers are accurate, then it leans towards the NUC rather than the Pi, no? Perf: 1x i5 NUC = 10x Pi $$: 1x i5 NUC = 10x Pi Power: 1x i5 NUC = 5x Pi So...if a single NUC gives you the performance of 10x Pis at the capital cost of 10x Pis but uses half the power of 10x Pis and only a single Ethernet port, how does the Pi win? -- Hugo On Mon 2015-May-11 17:08:43 -0500, Rafael Possamai raf...@gav.ufsc.br wrote: Interesting! Knowing a pi costs approximately $35, then you need approximately $350 to get near an i5.. The smallest and cheapest desktop you can get that would have similar power is the Intel NUC with an i5 that goes for approximately $350. Power consumption of a NUC is about 5x that of the raspberry pi, but the number of ethernet ports required is 10x less. Usually in a datacenter you care much more about power than switch ports, so in this case if the overhead of controlling 10x the number of nodes is worth it, I'd still consider the raspberry pi. Did I miss anything? Just a quick comparison. On Mon, May 11, 2015 at 4:40 PM, Michael Thomas m...@mtcc.com wrote: As it turns out, I've been playing around benchmarking things lately using the tried and true UnixBench suite and here are a few numbers that might put this in some perspective: 1) My new Rapsberry pi (4 cores, arm): 406 2) My home i5-like thing (asus 4 cores, 16gb's from last year): 3857 3) AWS c4.xlarge (4 cores, ~8gb's): 3666 So you'd need to, uh, wedge about 10 pi's to get one half way modern x86. Mike On 5/11/15 1:37 PM, Clay Fiske wrote: On May 8, 2015, at 10:24 PM, char...@thefnf.org 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 Cable management and heat would probably kill this before it ever reached completion, but lol… This feels like it should be a Friday thread. :) If you’re really going for density: - At 0.83 inches high you could go 2x per U (depends on your mounting system and how much space it burns) - I’d expect you could get at least 7 wide if not 8 with the right micro-USB power connector - In most datacenter racks I’ve seen you could get at least 8 deep even with cable breathing room So somewhere between 7x8x2 = 112 and 8x8x2 = 128 per U. And if you get truly creative about how you stack them you could probably beat that without too much effort. This doesn’t solve for cooling, but I think even at these numbers you could probably make it work with nice, tight cabling. -c
Re: Rasberry pi - high density
Did I miss anything? Just a quick comparison. If those numbers are accurate, then it leans towards the NUC rather than the Pi, no? Perf: 1x i5 NUC = 10x Pi $$: 1x i5 NUC = 10x Pi Power: 1x i5 NUC = 5x Pi So...if a single NUC gives you the performance of 10x Pis at the capital cost of 10x Pis but uses half the power of 10x Pis and only a single Ethernet port, how does the Pi win? -- Hugo On Mon 2015-May-11 17:08:43 -0500, Rafael Possamai raf...@gav.ufsc.br wrote: Interesting! Knowing a pi costs approximately $35, then you need approximately $350 to get near an i5.. The smallest and cheapest desktop you can get that would have similar power is the Intel NUC with an i5 that goes for approximately $350. Power consumption of a NUC is about 5x that of the raspberry pi, but the number of ethernet ports required is 10x less. Usually in a datacenter you care much more about power than switch ports, so in this case if the overhead of controlling 10x the number of nodes is worth it, I'd still consider the raspberry pi. Did I miss anything? Just a quick comparison. On Mon, May 11, 2015 at 4:40 PM, Michael Thomas m...@mtcc.com wrote: As it turns out, I've been playing around benchmarking things lately using the tried and true UnixBench suite and here are a few numbers that might put this in some perspective: 1) My new Rapsberry pi (4 cores, arm): 406 2) My home i5-like thing (asus 4 cores, 16gb's from last year): 3857 3) AWS c4.xlarge (4 cores, ~8gb's): 3666 So you'd need to, uh, wedge about 10 pi's to get one half way modern x86. Mike On 5/11/15 1:37 PM, Clay Fiske wrote: On May 8, 2015, at 10:24 PM, char...@thefnf.org 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 Cable management and heat would probably kill this before it ever reached completion, but lol… This feels like it should be a Friday thread. :) If you’re really going for density: - At 0.83 inches high you could go 2x per U (depends on your mounting system and how much space it burns) - I’d expect you could get at least 7 wide if not 8 with the right micro-USB power connector - In most datacenter racks I’ve seen you could get at least 8 deep even with cable breathing room So somewhere between 7x8x2 = 112 and 8x8x2 = 128 per U. And if you get truly creative about how you stack them you could probably beat that without too much effort. This doesn’t solve for cooling, but I think even at these numbers you could probably make it work with nice, tight cabling. -c signature.asc Description: Digital signature
