Building the Green Data Center
blackbearnh writes "O'Reilly News talked to Bill Coleman, former founder of BEA and current founder and CEO of Cassett Corporation, about the challenges involved in building more energy-efficient data centers. Coleman's company is trying to change the way resources in the data center are used, by more efficiently leveraging virtualization to utilize servers to a higher degree. In the interview, Coleman touches on this topic, but spends most of his time discussing how modern data centers grossly overcool and overdeploy hardware, leading to abysmal levels of efficiency."
Software has an impact, too. Messy, heavy code takes longer to run, takes more CPUs, etc. Imagine how much energy could be saved if there wasn't so much code bloat!
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He talks about turning off unused capacity like it's some future panacea, HP and VMWare have been doing it for a couple years already. He also dismisses turning servers off as not being a big deal but anyone who's run a datacenter knows that servers that have been running for years often fail when they are shut off. There are numerous physical reason for this from inrush current to bearing wear. A modern boot from SAN server is probably much less likely to fail at boot then older ones with DAS, but the chance is very much non-zero. Of course with a good dynamic provisioning system a single host failure doesn't matter because that new VM will just get spun up on a different host that's woken up.
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Switch the machines off at the the socket. You can do it using SNMP.
Monitor the average load on your machines, if too low, migrate everything off it and switch a machine off. If too high, switch one on.
Course it assumes you know how to create highly available load balanced clusters. Automatic installations, network booting and all that. Not so difficult.
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1. Get a data center
2. Paint it green
3. ???
4. Cthulhu
This is a huge topic, since so many different strategies are being brought to bear. For data center operators, energy efficiency is a business imperative since the power bills are soaring. Here are some sources offering ongoing reading about Green Data Centers:
The Green Data Center Blog
Data Center Knowledge
Groves Green IT
The Big List of Green Technology Blogs