ISO/IEC 30134-5:2017 

Part 5: IT Equipment Utilization for Servers (ITEUsv)

(Equivalent to EN 50600-4-5)

Description: Average utilisation of servers over time. ITEUsv describes the utilization of the server equipment in the DC in operational conditions. ITEUsv is developed with the knowledge that server energy efficiency tends to be optimal with higher utilization level.


Purpose: Purpose: ITEUsv accounts for utilization (the amount of time the server is actually doing work). ITEUsv indicates average CPU utilization in a year for all servers or a group of servers. The ITEUsv(t) value is high when most servers are running at high utilization status at time t.

Calculation formula:

Components:

CUSi (t) – CPU utilization at time t

ITEUsv (t) – Avg utilization of CPU & Cores at t


ITEUsv(t) is the average Central Processing Unit (CPU) utilization of all servers or a group of servers in a DC at time t. It corresponds to the sum of the CUSi(t) divided by N, with:

  • CUSi(t): CPU utilization ratio of server i at time t, measured by a performance monitoring tool provided by a server operating ystem

  • N: the number of servers in a DC or in a group running at time t

Measurement Points:

If a DC owner/operator utilizes server “power OFF” function to save energy consumption of servers in idle state, ITEUsv(t) shall be calculated by subtracting servers at “power OFF” state.


The DC shall monitor ITEUsv(t) for a year and collect all data. The DC shall then calculate the annual average of ITEUsv(t), which is the ITEUsv.


The interval of measurement shall be between 1 min and 1 h. The DC shall decide the interval based upon server operating conditions.


In case the measurement is made in a partial section of the DC or a group of servers in a DC, then the measured area shall be stated. This group shall be identical and designated to a measurement group of ITEEsv. ITEUsv shall not be summed among these groups. When there is no CPU monitoring tool applicable to some servers, these servers shall not be included in these groups.


During the measurement, the maximum value of ITEUsv(t) and its time shall be recorded. The maximum value of ITEUsv(t), or peak ITEUsv(t), is useful to set a target value of ITEUsv

Actionable Insights:

When servers are working at very low load there is both a cost and environmental impact. Invested Capex is not being made to work and Opex is unduly high due to the power consumed by equipment doing little ‘work’. This wasteful use of power also has an unreasonable environmental impact is wasting a valuable resource that can be beneficially consumed elsewhere. A DC owner/operator can overcome this by improving ITEUsv(t) and reducing the number of operating or powered servers required to deliver a given workload. 

BACK TO SUSTAINABILITY METRICS

ITEUsv - Sustainability Reporting Demo

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