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Introduction:

This green savings calculator is based upon using VMware virtualisation software for server consolidation purposes. It has been designed to show the likely savings that can be achieved by the virtualisation of your environment.

The calculator makes a number of assumptions, all of which are detailed in the notes at the bottom of this page.

The calculator will display the Cost Savings and Energy Savings, whilst also proving the number of trees planted and cars taken off the road for off setting.

Supporting Information

1. 90% of 2,000+ servers surveyed in the last year are running at less than 7% of their capacity. This provides the opportunity for consolidation of 90%. This does not include re-utilisation of existing hardware for other purposes.

2. Deverill have assumed that 4 years is the depreciated lifetime of a server.

3. HP Pro-liant ML350 G5 quad core dual Xeon processors) settles to approx 400w. Cost is £350.40 per server per year running 24hrs a day, 365. Cost of Electricity is 10p per KWH (Source: ukpower.co.uk).

4. Industry standard Annual Maintenance costs for a server range from £595pa.

5. HP ProLiant ML350 (G5) SAS Array Tower Server (Base Model) Xeon Quad-Core (E5310) 1.6GHz 1GB (2x512MB) no HDD SAS DVD. Costing £2300+vat from HP Sales assuming 4 yr straight line depreciation with no residual value.

6. HP Pro-liant ML350 G5 quad core dual Xeon processors) settles to approx 400W.

7. Does not include:

out-of-hours system maintenance
reduced administration and re-utilisation of office space
a reduction in cooling requirements.

8. Source DEFRA: A conversion factor of 0.523 KG of CO2 per KWH – This represents the average carbon dioxide emission from the UK national grid per kWh of electricity used at the point of final consumption. It only includes carbon emissions at UK power stations and does not include emissions resulting from production and delivery of fuel to these power stations (i.e. from gas rigs, refineries and collieries, etc.). The figure is based on a rolling average of emission factors for the last 5 years for which data is available (2001-2005). The rolling 5 year average factor is deemed by DEFRA as a suitable metric for calculating the carbon emissions of a company's electricity use.

9. Based on a Ford Focus 1.6TDCi which emits 115g/KM (Source: Ford Motor Company). Assuming an average mileage of 12,000miles per year; a single vehicle would emit 2,300 KG of CO2 per year. Lifetime benefit is calculated as the number of cars taken off the road per year, multiplied by 4 (ie, 4 years).

10. Source: carbonfootprint.com – Native broadleaf trees provide sustainable habitat for wildlife and enhance the natural landscape. These are therefore commonly used for Carbon offsetting projects. Over the course of its lifetime a broadleaf tree absorbs on average 730KG of CO2.