Redundant networking is a good idea, but using two interfaces with unique IP addresses doesn't really make much sense as an automated failover system. Linux supports channel bonding, which is preferable if your switches support it. Manageable HP ProCurve switches with such features are pretty cheap these days.
On Feb 10, 2010, at 1:12 PM, Jeff Silverman wrote:
Ski,I recommend that you get two switches, so that you don't have a single point of failure. Each server should have two ethernet ports, one for each switch, and two IP addresses. That way, if one of your switches goes down, your cluster will still run.Pick a safety margin on your power strips. At Real Networks, we used 50%. That's probably too conservative, but that's what we picked. So you have 5 nodes, figure 5 Amps/node, that's 25 Amps. With a safety factor of 50% that means you have to have 50 Amps of power. That is 3 phases, 20 A/phase, a nice round number. I would try to spread the load over different phases so that if you lose a phase, at least some of your machines will keep going. Naturally, you have to scale this number up to accommodate growth.You should provide 2500 Watts * 3.4 BTUs/hr/watt = 8500 BTUs/hr of cooling. You have to scale this number for growth as well.Silicon Mechanics is in this business. I am working with Shane Huntress on a similar project.Jeff -- Jeff Silverman, linux sysadmin nine two four twentieth avenue east Seattle, WA, nine eight one one two -3507 (2O6) 329-1O94 [email protected] (note the zero!) http://www.commercialventvac.com/~jeffs/Read my book, "Failure is Not an Option: How to build reliable computer systems from unreliable parts using Open Source software" http://www.commercialventvac.com/~jeffs/finao "_______________________________________________ Members mailing list [email protected] http://lists.sasag.org/mailman/listinfo/members
Benjamin Krueger [email protected]
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