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| Desktop computers are often left on all the time. The main reasons for this practice are: | The following is a list of common reasons why computers are left on all the time: |
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| As a result computers are often on, consuming electricity without doing any useful work. Unfortunately moving computers into low power states is more difficult than switching off a light bulb - something that most people are accustomed to. This section of the low carbon ICT wiki aims to provide information about tools that can be deployed to support organisations in reducing the costs and carbon footprint of their desktop computing infrastructure.[[TableOfContents([2])]] | * A computer is used to keep another computer on * A computer is used to filter emails all the time * Spare computing capacity is 'donated' to science experiments Tools can be used to minimise the amount of time computers are left on without doing any useful work. Organisation will also have to decide if any practices need to change because they are too costly. |
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== Automatic power management == Most desktop computers can be configured to move into low power states after a defined period of inactivity. Most operating systems can move a computer in S3 (often called "sleep" or "standby" ) or S4 ("hibernate"). Unfortunately computers may move into low power state when a process is running 1. Once in a low power state computers may not respond to being turned on remotely * Automatically putting a computer into S3, S4 or S5 power states * Issues * when in standby computers cannot easily be switched off automatically * computers don't wake from S3 or S4 reliably * don't want to interrupt services that may be running in background * Enable end-users to configure power management * Distribute power management setting centrally == Remote power management == === Switching computers on remotely === ==== Wake-on-LAN ==== * Introductory text * ["lcict:wol"] ==== VPro ==== * http://www.intel.com/technology/vpro/index.htm === Switching computers off remotely === 1. How to turn computer off remotely = Support = = More efficient working practices = create matrix of: (1) practice/ activity description (2) measure of how much energy will be saved (3) who the practice is relevant to * switching monitor off will prevent it turning on when accessing computer remotely * implement power management * |
== Wake on LAN == ["lcict:wol"] |
The following is a list of common reasons why computers are left on all the time:
- An external service needs access the computer e.g. backup
- An individual needs to access their computer e.g. to retrieve a file while at a conference
- An individual wants to avoid waiting for a computer to start up
- A computer is used to keep another computer on
- A computer is used to filter emails all the time
- Spare computing capacity is 'donated' to science experiments
Tools can be used to minimise the amount of time computers are left on without doing any useful work. Organisation will also have to decide if any practices need to change because they are too costly.
Tools and techniques
Wake on LAN
["lcict:wol"]