Power Distribution for SETI servers
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Power Distribution for SETI servers
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jstonge123 Send message Joined: 27 Sep 99 Posts: 8 Credit: 908,512 RAC: 3 
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Just for my curiosity, do the servers at SETI have UPS/generator sources? ID: 959492 ·  |
 Pappa  Send message Joined: 9 Jan 00 Posts: 2562 Credit: 12,301,681 RAC: 0
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Seti has UPS, there is a generator for the building but Seti is not considered a critical item. Other projects in the building are considered Critical. Those type of items would end up on seperate grids within the building. Regards Please consider a Donation to the Seti Project. ID: 959494 · |
Pooh Bear 27  Send message Joined: 14 Jul 03 Posts: 3224 Credit: 4,603,826 RAC: 0
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The power grid was off for 24 hours, even with UPS systems most of the time you only get a few hours. SETI does not own a diesel generator, nor does it have the funds to buy and keep one up. ID: 959532 · |
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1mp0£173 Send message Joined: 3 Apr 99 Posts: 8423 Credit: 356,897 RAC: 0
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The power grid was off for 24 hours, even with UPS systems most of the time you only get a few hours. SETI does not own a diesel generator, nor does it have the funds to buy and keep one up. More to the point, BOINC has a number of features that are designed to deal with unreliable connectivity, unreliable power, and all measures of service interruption. Going to great lengths to insure that SETI@Home is never ever shut down or unreachable is not only an expense, it demonstrates that BOINC is not as fault tolerant as it is meant to be. Anyone who thinks otherwise should really read this white paper. ID: 959569 · |
HAL9000  Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57
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The power grid was off for 24 hours, even with UPS systems most of the time you only get a few hours. SETI does not own a diesel generator, nor does it have the funds to buy and keep one up. You mean we can't have a Tier 1 data center with the budget of...naught. I'm cornfused and bewildered! SETI@home classic workunits: 93,865 CPU time: 863,447 hours  Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[
ID: 959587 · |
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1mp0£173 Send message Joined: 3 Apr 99 Posts: 8423 Credit: 356,897 RAC: 0
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The power grid was off for 24 hours, even with UPS systems most of the time you only get a few hours. SETI does not own a diesel generator, nor does it have the funds to buy and keep one up. I was thinking more along the lines of "a bold experiment to do great stuff without a tier 1 data center." The basic idea of BOINC: These are interesting and important computational projects, but completely unlikely to ever generate the kind of money that will pay for the amount of computing needed. So, a method is developed where volunteers can donate unused machine cycles, and those idle cycles can be utilized at a very low cost. If SETI@Home does the things that most of the whining users demand, then BOINC is clearly a failure, and big science is not possible without a big budget. ID: 959595 · |
Reuben Gathright  Send message Joined: 8 Mar 01 Posts: 213 Credit: 14,594,579 RAC: 0
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As a DBA myself, I assume that the UPS systems on the SETI servers are there to help maintain power while they shut down. In fact, in the event of a power outage, you could expect the SETI staff to wait several hours after power is restored before turning on the equipment again. The practice allows the UPS systems to recharge their batteries and ensure that power is truly reliable again. Shutting servers on and off with legacy RAID systems is not a good idea. Overclock with the MSI G31M3-L and Intel E8600 3.33Ghz Intel D865GLC Socket 478 Motherboard ~How To Overclock The Eee ASUS 1005HA Netbook To 1.9Ghz~ ID: 959792 · |
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1mp0£173 Send message Joined: 3 Apr 99 Posts: 8423 Credit: 356,897 RAC: 0
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As a DBA myself, I assume that the UPS systems on the SETI servers are there to help maintain power while they shut down. They're tight on rack space, so you can pretty much assume standard UPSes without extended batteries. Most of those are only good for about 15 to 20 minutes even with a half-load. In other words, enough time for the servers to gracefully shut down and then signal the UPS so it can cycle power if needed. They also horribly abuse the batteries. ID: 959845 · |
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Ianab Send message Joined: 11 Jun 08 Posts: 732 Credit: 20,635,586 RAC: 5 
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They're tight on rack space, so you can pretty much assume standard UPSes without extended batteries. http://setiathome.berkeley.edu/sah_photos.php?album=closet_12_22_2008 These are the latest pics of the cabinets (from a couple of years back) and show a couple of rackmount UPS sitting in the bottom of the cabinet. But I would say you are right, they wont run that load for very long. Protection for brief power interuptions or brownouts, and enough time to do a controlled shutdown if you are lucky. Ian ID: 959862 · |
zoom3+1=4  Send message Joined: 30 Nov 03 Posts: 65736 Credit: 55,293,173 RAC: 49
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They're tight on rack space, so you can pretty much assume standard UPSes without extended batteries. We used to have power outages out here until high winds forced SCE to replace a good number of older wooden power poles with new wooden power poles, 2009 was the 1st year without a power failure in the summer that I've seen since I moved out here in July 2004. :D The T1 Trust, PRR T1 Class 4-4-4-4 #5550, 1 of America's First HST's 
ID: 959875 · |
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