197 lines
3.9 KiB
HTML
197 lines
3.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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>Virtual Servers: Consolidation and Virtualization</TITLE
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Linux Ecology-HOWTO"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Reduction of Power Consumption"
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HREF="ecology-howto-power-consumption.html"><LINK
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REL="PREVIOUS"
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TITLE="Screensavers"
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><TR
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>Linux Ecology-HOWTO</TH
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>Chapter 1. Reduction of Power Consumption</TD
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NAME="ecology-howto-virtualservers"
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>1.5. Virtual Servers: Consolidation and Virtualization</H1
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><P
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> On enterprise networks, or on the Internet, security constraints may require
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that different services are run on different, isolated servers.
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The problem with this one server per service approach
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is that most spend a lot of idle time waiting for some rare activity bursts.
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</P
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><P
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> Several technologies now make it possible to run several GNU/Linux servers
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inside a real, physical GNU/Linux server. As in physical servers, each virtual server
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is isolated from the others. So, this approach retains the benefits of
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separate servers, but makes it possible to share some hardware resources
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like the CPU and network bandwidth. On the other hand, each virtual server
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enjoys a reserved amount of RAM and disk space.
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</P
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><P
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> The benefits of virtual servers are obvious in terms of cost, power consumption,
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optimum use of hardware resources, and consumption of computer materials.
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There is another key advantage for hardware maintenance: virtuals servers
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can very easily and transparently be migrated from one physical server to another.
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</P
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><P
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> Virtualization solutions:
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</P
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><P
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></P
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><UL
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><LI
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><P
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> <A
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HREF="http://user-mode-linux.sourceforge.net/"
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TARGET="_top"
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>User Mode Linux</A
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>
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- The original solution. Allows to run one or several Linux kernel executables
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on a Linux machine (with a standard kernel) as regular programs.
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</P
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></LI
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><LI
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><P
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> <A
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HREF="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/"
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TARGET="_top"
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>Xen</A
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>
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- An increasingly popular alternative, with very little performance overhead.
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Also allows live server migration to other hardware. Requires a patched Linux kernel.
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</P
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></LI
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></UL
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><P
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> Virtuals servers all already very popular solutions for website hosting,
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but virtualization still has a very strong potential in corporate networks.
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</P
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>Prev</A
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>Screensavers</TD
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>Energy Star Label</TD
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> |