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| This section pulls together information regarding power management on "PCs" and "laptops". | ## page was renamed from lcict:pcs and laptops #acl KangTang:read,write,admin All:read '''This page is under construction!''' |
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| = Overview = | A single desktop computer will consume approximately £75 of electricity per year if they are left on all the time. If they are put in a low power state when not in use this cost is likely to fall to £15 for the majority of users (insert ref.).This figure extrapolated to all the estimated 720 000 computers in UK Universities equates to an annual saving of around £40 million. This calculation assumes that all these computers can be switched off at the end of each normal working day which will not be the case. Computers are often left on for the following reasons: * So that a central backup service can make a copy of files overnight * So that a central service can install general software updates and security patches * To allow access to a computer when off site e.g. to retrieve a file while at a conference * To avoid waiting for a computer to start up from off * So that a personal computer can also act as a web server or central file store * A personal computer is used to keep another computer on ("keep alives") * A computer is used to constantly filter emails so that email folders are organised when accessing messages through the web * To allow spare computing capacity to be used by computer modelling projects e.g. SETI, climateprediction.net and GRID experiments in general * Standby (S3) and hibernate (S4) power saving modes cannot be implemented reliably Many of these reasons mean that computers are being left on 'just in case' they are needed which means inevitably that there is likely to be extensive periods of time that computers are consuming electricity without doing useful work. Tools can be provided for IT managers and end-users that support the objective of minimising this wasted energy but organisations will also have to make decisions on whether practices need to change to save CO2 emissions and money. [[TableOfContents([2])]] |
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| = Support = == Local power management == === Enable end-users to configure power management === === Distribute power management setting centrally === == Remote power management == === Switching computers on remotely === ==== Wake-on-LAN ==== ==== VPro ==== === Switching computers off remotely === ==== Through remote desktop ==== ==== Distributing desktop icon ==== |
== Enabling users to wake computers up remotely == It is possible to provide the ability for IT managers and end-users to wake computers that they own using another computer. By providing a facility to turn computers on remotely, it becomes possible to ask people to turn their computers to low power states more often. For instance, many organisations will ask their staff to leave their computers on so that the a backup service can access the hard drive and create a copy of files. If computers can be woken up by the backup service then users can switch them off without disrupting this essential activity. This same logic applies to other services that may need access to a computer more regularly e.g. services that install software updates, anti-virus checking and so on. === Case study: University of Oxford === The University of Oxford developed a wake-on-LAN infrastructure that enables IT officers, end-users and 3rd party software to wake computers remotely. ["lcict:wol"] == Configuring computers to move into low power states automatically == |
This page is under construction!
A single desktop computer will consume approximately £75 of electricity per year if they are left on all the time. If they are put in a low power state when not in use this cost is likely to fall to £15 for the majority of users (insert ref.).This figure extrapolated to all the estimated 720 000 computers in UK Universities equates to an annual saving of around £40 million. This calculation assumes that all these computers can be switched off at the end of each normal working day which will not be the case. Computers are often left on for the following reasons:
- So that a central backup service can make a copy of files overnight
- So that a central service can install general software updates and security patches
- To allow access to a computer when off site e.g. to retrieve a file while at a conference
- To avoid waiting for a computer to start up from off
- So that a personal computer can also act as a web server or central file store
- A personal computer is used to keep another computer on ("keep alives")
- A computer is used to constantly filter emails so that email folders are organised when accessing messages through the web
- To allow spare computing capacity to be used by computer modelling projects e.g. SETI, climateprediction.net and GRID experiments in general
- Standby (S3) and hibernate (S4) power saving modes cannot be implemented reliably
Many of these reasons mean that computers are being left on 'just in case' they are needed which means inevitably that there is likely to be extensive periods of time that computers are consuming electricity without doing useful work. Tools can be provided for IT managers and end-users that support the objective of minimising this wasted energy but organisations will also have to make decisions on whether practices need to change to save CO2 emissions and money.
Tools and techniques
Enabling users to wake computers up remotely
It is possible to provide the ability for IT managers and end-users to wake computers that they own using another computer. By providing a facility to turn computers on remotely, it becomes possible to ask people to turn their computers to low power states more often. For instance, many organisations will ask their staff to leave their computers on so that the a backup service can access the hard drive and create a copy of files. If computers can be woken up by the backup service then users can switch them off without disrupting this essential activity. This same logic applies to other services that may need access to a computer more regularly e.g. services that install software updates, anti-virus checking and so on.
Case study: University of Oxford
The University of Oxford developed a wake-on-LAN infrastructure that enables IT officers, end-users and 3rd party software to wake computers remotely. ["lcict:wol"]