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Power-saving solutions on servers


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#1 DnDer

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Posted 28 October 2008 - 10:35 AM

Learning about corporate server technology, and came across this article. Most of the solutions made sense to me, at least a little. I got lost when he started talking about booting from snapshots and copying RAM. Can someone break down and explain the excerpt? I'll bold the parts that specifically went over my head.

You can also select systems that cold-boot rapidly. Model to model and brand to brand, servers exhibit wide variances in power-up delay. This metric isn't usually measured, but it becomes relevant when you control power consumption by switching off system power. It needn't take long. Servers or blades that boot from a snapshot, a copy of RAM loaded from disk or a SAN can go from power-down mode to work-ready in less than a minute. The most efficient members of a reserve/disaster farm can quiesce in a suspend-to-RAM state rather than be powered down fully so that wake-up does not require BIOS self-test or device querying and cataloging, two major sources of boot delay.



Suspend-to-RAM I get. That's like a hibernation mode where everything's powered down except the RAM, which is carrying enough power to hold activation instructions? But how do you copy RAM, and from a disk, no less? I can't quite wrap my head around that yet.

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#2 garmanma

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Posted 28 October 2008 - 11:10 AM

http://dlc.sun.com/osol/docs/content/IPS/gggyv.html

I've read where they say the next generation BIOS chips will actually have a version of Linux installed for instant boot configurations
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