Sustainability MetricsLast Updated February 20, 2025
Sustainability metrics are collected for virtual machine, host system, cluster
compute resource, vSphere World, and Organization 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)) |
Sustainability|Adjusted Score|Workload Efficiency (%) | Organization | Indicates efficiency based on resource wastage in the environment. Formula: Workload Efficiency (%)
= 100 - (Wastage/Usage Ratio CPU + Wastage/Usage Ratio Memory +
Wastage/Usage Ratio Disk) * 100 / 3 |
Sustainability|Adjusted Score|Hardware Efficiency (%) | Organization | Indicates efficiency of hardware in the environment, based on the age
of the hardware with the assumption that newer hardware is more energy
efficient than older hardware. Formula: Hardware Efficiency (%)
= ((10 - Average Age of Servers)/ 10 * 30%) +((10 - Average Age of
Storage)/ 10 * 30%) + ((10 - Average Age of Network)/ 10 * 20%) +
((10 - Average Age of Desktop)/ 10 * 20%) The Average age of
hardware variables in the formula is provided in the
Organization Details page. |
Sustainability|Adjusted Score|Resource Utilization (%) | Organization | Indicates utilization levels of the physical resources in the
environment. Formula: Resource
Utilization (%) = (Virtualized Server (%) * 44.45%) + (Virtualized
Storage (%) * 33.33%) + (Virtualized Network (%) *
22.22%) |
Sustainability|Adjusted Score|Virtualization (%) | Organization | Indicates the extent of virtualization in the environment. Formula: Virtualization (%) =
(Server Virtualization (%) * 0.4) + (Storage Virtualization (%) *
0.3) + (Network Virtualization (%) * 0.2) + (Desktop Virtualization
(%) * 0.1) |
Sustainability|Adjusted Score|Power Source (%) | Organization | Indicates the sources of power being used in the environment. Usage
of renewable energy sources leads to lesser carbon emission. Formula: Power Source Efficiency
(%) = Sum(Adjusted Scores of each Power Source) Adjusted Scores of Power
Source = Power Source Green Factor * Power Source Share in
Organization |
Sustainability|Hardware Utilization|Server (%) | Organization | Indicates server utilization levels. Formula: Virtualized Server (%) =
((Total ESXi Hosts CPU Utilization (GHz) / Total ESXi Hosts CPU
Capacity (GHz)) + (Total ESXi Hosts Memory Utilization (TB) / Total
ESXi Hosts Memory Capacity (TB))) / 2 |
Sustainability|Hardware Utilization|Storage (%) | Organization | Indicates storage utilization levels. Formula: Virtualized Storage (%)
= (Total datastores utilization + Total RDM) / (Total datastores
capacity + Total RDM + Physical Disk Overhead) |
Sustainability|Green Score (%) | Organization | A score that indicates how efficient or green your data center is. Formula: Green Score (%) =
(Workload Efficiency (%) * 22.5%) + (Resource Utilization (%) *
12.5%) + (Virtualization Adoption (%) * 15%) + (Power Source
Efficiency (%) * 37.5%) + (Hardware Power Efficiency (%) *
12.5%) |
Sustainability|Power Usage (kWh) | Organization | Sum of the power usage across all the clusters in the environment. Formula: Power Consumption = Sum
( (Cluster) Sustainability|Power Usage (kWh) ) |
Sustainability|CO2 Emission (kg) | Organization | Total carbon emissions in the environment based on power consumed. Formula: CO2 Emission = Power
Consumption * CO2 Emission Ratio |
Sustainability|Workload Efficiency|Idle VM Count | Organization | Number of Idle VMs, which are considered idle based on the
Reclamation Idleness settings. |
Sustainability|Workload Efficiency|Orphaned Disk Space (GB) | Organization | The aggregated size of all orphaned disks which are reclaimable based
on the Orphaned Disk Reclamation settings. |
Sustainability|Workload Efficiency|Oversized VM Count | Organization | Number of Oversized VMs, which are considered oversized by the
capacity engine recommendation and are not in the Power Off state. |
Sustainability|Workload Efficiency|Powered Off VM Count | Organization | The number of VMs which have been in the Powered Off state for the
last 7 days. The number of days (7) can be configured from the
Reclamation Settings. |
Sustainability|Workload Efficiency|Snapshot Disk Space (GB) | Organization | The aggregated size of all snapshots which are reclaimable based on
the Snapshot Reclamation settings. |