Sustainability metrics are collected for virtual machine, host system, cluster compute resource, and vSphere World object types.

## Metric Names

Metric Name | Object Type | Description |
---|---|---|

Power|Total Energy (Wh) | Virtual Machine | Total energy used. Formula: Total Energy (Wh) = Sum(Power|Energy (Joule))/3600 |

Power|Total Energy (Wh) | Host System | Total energy used. Formula: Total Energy (Wh) = Sum(Power|Energy (Joule))/3600 |

Sustainability|CO2 Emission (Kg) | Cluster Compute Resource | Carbon dioxide emissions. Calculated as power consumption* CO2 Emission rate Formula: CO2 Emission (Kg) = Sum(Host System(Power|Total Energy(Wh)))/1000 * 0.709 |

Sustainability|CO2 Emission before Virtualization (Kg) | Cluster Compute Resource | Carbon dioxide emissions before virtualization, assuming that power consumption per physical server is 100W, reflecting a low end hardware specification. Formula: CO2 Emission before Virtualization (Kg) = Summary|Number of Running VMs * 0.1 * 0.709 |

Sustainability|CO2 Emission by Idle VMs (Kg) | Cluster Compute Resource | Total carbon dioxide emission from all idle VMs. Calculated as CO2 emission rate * Power consumed by Idle VMs, where the rate is set at cluster property / 1000. Formula: CO2 Emission by Idle VMs (Kg) = Sum(VM(Power|Total Energy (Wh)), If VM(Summary|Reclaimable Idle = 1) * 0.709 OR CO2 Emission by Idle VMs (Kg) = Power Wasted by Idle VMs (Wh) * 0.709 |

Sustainability|Electricity Cost Savings | Cluster Compute Resource | Estimated cost savings by virtualizing workloads. Calculated from the difference between power consumption before virtualization and after virtualization. The electricity cost is defined at the cluster custom property. Formula: Electricity Cost Savings = (Summary|Number of Running VMs * 0.1 - Sum(Host System(Power|Total Energy(Wh)))/1000) * 0.108 OR Daily Electricity Cost Savings = (Summary|Number of Running VMs * 0.1 - Power usage (KWh)) * 0.108 |

Sustainability|Power usage (KWh) | Cluster Compute Resource | Power usage calculated from all hosts in KWh. Formula: Power usage (KWh) = Sum(Host System(Power|Total Energy(Wh))/1000 |

Sustainability|Power usage per GHz (Wh) | Cluster Compute Resource | Power usage efficiency. Calculated as power consumption over total GHz. Formula: Power usage per GHz (Wh) = Sum(Host System(Power|Total Energy(Wh))/CPU|Usage (MHz)/1000 |

Sustainability|Power Wasted by Idle VMs (Wh) | Cluster Compute Resource | Sum of electricity power used by all VMs classified as idle by the system. Formula: Power Wasted by Idle VMs (Wh) = Sum(VM(Power|Total Energy (Wh)), If VM(Summary|Reclaimable Idle = 1) |

Sustainability|Trees to Offset Idle VMs CO2 Emission | Cluster Compute Resource | Number of standard trees required to compensate CO2 emission of all Idle VMs. Based on 36.4 pound of carbon per tree. Formula: Trees to Offset Idle VMs CO2 Emission = Sum(VM(Power|Total Energy (Wh)), If VM(Summary|Reclaimable Idle = 1)/1000 * 0.709 / 16.511 OR Trees to Offset Idle VMs CO2 Emission = Power Wasted by Idle VMs (Wh)/1000 * 0.709 / 16.511 |

Sustainability|CO2 Emission (Kg) | vSphere World | Total carbon dioxide emissions. Calculated as sum of carbon emission from all clusters. Formula: CO2 Emission (Kg) = Sum(Cluster(Sustainability|CO2 Emission (Kg)) |

Sustainability|CO2 Emission before Virtualization (Kg) | vSphere World | Total carbon dioxide emissions before virtualization. Calculated as the sum of CO2 emission from all clusters. Formula: CO2 Emission before Virtualization (Kg) = Sum(Cluster(Sustainability|CO2 Emission before Virtualization (Kg))) |

Sustainability|CO2 Emission Avoided (T) | vSphere World | Carbon emissions avoided with virtualization. Calculated by difference in values of carbon emissions before and after virtualization and converting value in Kg to Tonnes. Formula: CO2 Emission Avoided (T) = (CO2 Emission before Virtualization (Kg) - CO2 Emission (Kg)) / 1000 |

Sustainability|Electricity Cost Savings | vSphere World | Total estimated cost savings by virtualizing workloads at vSphere World. Calculated as the sum of Electricity cost savings. Formula: Electricity Cost Savings = Sum(Cluster(Daily Electricity Cost Savings)) |

Sustainability|Power Savings with Virtualization (%) | vSphere World | Percentage of power savings achieved by virtualization. Calculated by Formula = (Power usage before Virtualization - Power usage after Virtualization)/Power usage before Virtualization *100. Formula: Power Savings with Virtualization (%) =( Power usage Before Virtualization (KWh) - Power usage (KWh) ) / Power usage Before Virtualization (KWh) * 100 |

Sustainability|Power usage (KWh) | vSphere World | Power usage calculated from all hosts in KWh. Formula: Power usage (KWh) = Sum(Host System(Power|Total Energy(Wh)))/1000 |

Sustainability|Power usage Before Virtualization (KWh) | vSphere World | Power usage assuming that each low range server consumes 0.1 KWh. Formula: Power usage Before Virtualization (KWh) = Summary|Number of Running VMs * 0.1 |

Sustainability|Power Wasted by Idle VMs (Wh) | vSphere World | Sum of electricity power used by all VMs classified as idle by the system. Formula: Power Wasted by Idle VMs (Wh) = Sum((VM(Power|Total Energy (Wh)), If VM(Summary|Reclaimable Idle = 1)) |