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The case for the /usr merge

The case for the /usr merge

Posted Jan 30, 2012 18:28 UTC (Mon) by dlang (subscriber, #313)
In reply to: The case for the /usr merge by raven667
Parent article: The case for the /usr merge

I have seen capacity growing at the rates that you are talking about, but not energy efficiency.

do you have pointers to the efficency claims for capacity/power savings growing that significantly?

the other issue is that electricity is pretty cheap, so it takes a LOT of power savings to equal the cost of a new server.

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The case for the /usr merge

Posted Jan 30, 2012 20:12 UTC (Mon) by raven667 (subscriber, #5198) [Link]

The efficiency is that you can run an 8 or 12 core machine with 64-128GB RAM using the same power as a 2 core machine with 4-8G RAM from 5 years ago. Power needs per CPU core are dropping. That trend coupled with virtualization allows you to get more out of you new hardware purchase, consolidating 20:1 on servers and 40:1 on power to run the same workload, and giving plenty of breathing room for your facilities for growth. Having a datacenter run out of power/cooling is very expensive.

The case for the /usr merge

Posted Jan 30, 2012 20:30 UTC (Mon) by dlang (subscriber, #313) [Link]

consolidating 20:1 on servers is fantastic, my company is going heavily into vitualization and is only seeing about 3:1 so far (with the target being 6:1)

also, this sort of savings from virtualization assumes that you are running your prior servers lightly loaded. If you have an application that is large enough that you need to run it on multiple machines to start with, virtualization is a net loss (although this net loss is frequently covered by by doing the consolidation at the same time as a server upgrade)

I don't know about your servers, but on the ones I am seeing 8-12 cores with 64-128G of ram takes significantly more power than the 2-core servers with 4-8G of ram that I still have in production. measurements show somewhere between 2x and 3x

The case for the /usr merge

Posted Jan 30, 2012 21:06 UTC (Mon) by sbergman27 (guest, #10767) [Link]

This reminds me of that great TV commercial IBM did several years ago. "They've stolen the servers! They've stolen the servers!"

The Heist:


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