OT: Biggest expense
Posted Aug 4, 2009 22:09 UTC (Tue) by man_ls
In reply to: OT: Biggest expense
Parent article: Notes from the Montreal Linux Power Management Mini-Summit
It makes a lot of sense. Maybe at Google things are different, due to a couple of factors:
- Their legendary ability to automate things: admins manage thousands of servers each. After a quick search it seems that the exact figure is 20k servers per admin.
Their huge purchasing power: if they buy 20M servers at a time I guess that they get a special price. Hey, if the used their own house brand it would be a big one, if not the biggest one in the industry; after all they do that with web servers.
For the rest of us things are different. At 0.10$/kWh, one server using 1kW (a high powered beast) at all times costs ~900$/yr. For a 100k$/yr admin (fully loaded) the breaking point is at ~110 high-powered servers per admin -- kind of the industry average according to the first link. You have to manage more per admin to spend more on power than on people, so in an IT department with any development payroll should win hands down.
Similarly, if each server costs 3k$, the breaking point is with a lifecycle of just ~3 years. I would say that either machines cost more or use less juice, so servers should be above power too.
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