Server energy usage:
An average server consumes4 about 230 Watt per hour. Rule of thumb is that the same amount of energy is used for cooling, Uninterruptable Power Supply (UPS) etc. Based on this information this means that every distribution server uses:
0,46 Kwh * 24 hours * 365 days = 4030 Kwh per year.
By avoiding the use of distribution servers a reduction5 of 2178 Kg CO2 emission per server can be accomplished.
Server example:
An organization has 100 branch offices. The presence of a distribution server on each branch office is currently necessary to avoid WAN congestion.
DistriBrute can reduce the emission CO2 with 100 * 2178 = 218 ton
Desktop energy usage:
There are still many organizations that keep their desktops on during nightly hours. All desktops consume large amounts of energy while they are waiting for their updates. An average desktop is using 100 Watts.
Desktop example6:
You have to install Microsoft Office 2007 on 1000 desktops that now have Microsoft Office 2003 installed. This is a job that normally has to be done during evening hours. The update is 800 Mb per desktop. This means that a total of 1000 * 800 MB = 800.000 MB has to be transferred to all desktops. A distribution server with a 1 Gbit connection can handle 10 desktop connections concurrent without really slowing down. In the most ideal situation the server can offer 10 * 100 Mbit connections. The desktops need roughly 90 seconds to get Microsoft Office 2007 after which the installations start.
There are however 990 desktops left. So we need:
100 * 90 seconds = 9000 seconds to get Microsoft Office 2007 on all desktops.
If we deploy Microsoft Office 2007 via DistriBrute you can force all desktops to have their data in….. 120 seconds. All 1000 desktops start and finish the Office 2007 installation within a minute from each other.
On paper the difference is 8880 seconds. We are aware of the fact that the first desktops installed via the old situation, can also be shut down after they are finished. We therefore take half of the 8880 seconds which brings us to 4440 seconds. This is 1.23 hour per desktop.
DistriBrute saves 1000 * 100 Watts * 1,23 hours = 123 Kwh for this session alone. How many maintenance actions does your IT department have to do in a year? And how many desktops are involved?
4 Report: 'Estimating total power consumption by servers in the U.S. and the world' by Jonathan G. Koomey, Ph.D. - Staff Scientist, Lawrence Berkeley National Laboratory and Consulting Professor, Stanford University
5 A simple carbon calculator can be found on http://www.nef.org.uk/greencompany/co2calculator.htm
6 In this example we are using the most ideal situation that can be imagined. In real situations there are factors that slow down the network performance like hard disk throughput of desktops, fragmentation of hard disks and effective speed of network adaptors.
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