On Dec 23, 2010, at 5:44 PM, Tracy Reed wrote: > On Thu, Dec 23, 2010 at 04:29:40PM -0700, Andrew Hume spake thusly: >> 7) power supplies.... doug's point is well taken. one thing i would >> investigate >> hard before building more is fabricating the wiring harnass so as to connect >> to the modular >> power supplies common today (such as my fave, OCZ fata1ity). then all the >> power >> could come from one beefy supply, and improve the airflow a fair bit. > > By "modular power supplies common today" mean you models/brands and not some > new sort of modular power supply technology or form factor, right?
i mean power supplies with modular connecters for the wiring harnesses. that is, instead of the old hardwired harness terminating inside the power supply, you have a number of sockets on the outside of teh power supply and a number of supplied power cables with PS connectors on one end, and Molex/SATA/etc connectors on the other. the idea is that you connect what you need and nothing else. > > OCZ fata1ity? You would really put red LED bling in a server? absolutely ;) > >> i have found power supplies quite reliable, and therefore don't worry too >> much about them failing. > > I have found power supplies rather failure prone, second only to hard drives. > Especially if you are going to be running them at more than 80% of their rated > capacity. > >> in fact, given our application sits on top of the Ningaui cluster framework, >> i would handle possible power supply failures by replicating files across a >> pair of backblazes, instead of within each backblaze. > > Googling for Ningaui cluster framework does not bring up much other than a > small blurb written for USENIX in 2002. Is this not a publically available > project? awkward question with no good answer. having the software doesn't matter as much as the idea. the most appropriate paper is freenix 2002 by hume and daniels. > > -- > Tracy Reed > http://tracyreed.org ------------------ Andrew Hume (best -> Telework) +1 623-551-2845 [email protected] (Work) +1 none currently AT&T Labs - Research; member of USENIX and LOPSA
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