ISO/IEC 30134-4:2017

Information technology — Data centres — Key performance indicators — Part 4: IT Equipment Energy Efficiency for servers (ITEEsv)

ISO/IEC 30314-4:2017 specifies Information Technology Equipment Energy Efficiency for servers (ITEEsv), a key performance indicator (KPI) which quantifies the energy efficiency characteristics of servers in a data centre. ITEEsv can be calculated using a choice of pre-existing or context specific server performance benchmarks. ITEEsv intends to assist in improving the aggregate energy effectiveness of servers in a given data centre. ISO/IEC 30314-4:2017: a) defines ITEEsv; b) describes the purpose of ITEEsv; c) describes how to use ITEEsv; d) describes reporting of ITEEsv.

Technologies de l'information — Centres de traitement de données — Indicateurs de performance clés — Partie 4: Efficacité énergétique des appareils de technologies de l'information (TI) concernant les serveurs

General Information

• Status: Published
• Publication Date: 17-Oct-2017
• ICS: 35.020 - Information technology (IT) in general
• Technical Committee: ISO/IEC JTC 1/SC 39 - Sustainability, IT and data centres
• Drafting Committee: ISO/IEC JTC 1/SC 39 - Sustainability, IT and data centres
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 05-Jun-2023

Standards Content (Sample)

ISO/IEC JTC 1/SC 39
Date:2017-06-2210-15
ISO-/IEC_FDIS 30134-4
ISO/IEC TC JTC 1/SC 39/WG 1
Secretariat: ANSI
Information technology — Data centres — Key performance indicators — Part 4: IT
Equipment Energy Efficiency for Servers (ITEEsv)
Technologies de l'information -- Centres de traitement de données -- Indicateurs
de performance clés -- Partie 4: Efficacité énergétique des appareils de
technologies de l'information (TI)

---------------------- Page: 1 ----------------------
Foreword
ISO (the International Organization for Standardization) and IEC (the International
Electrotechnical Commission) form the specialized system for worldwide standardization.
National bodies that are members of ISO or IEC participate in the development of International
Standards through technical committees established by the respective organization to deal with
particular fields of technical activity. ISO and IEC technical committees collaborate in fields of
mutual interest. Other international organizations, governmental and non-governmental, in liaison
with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have
established a joint technical committee, ISO/IEC JTC 1.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for
the different types of document should be noted. This document was drafted in accordance with
the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in
the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does
not constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the
following URL: www.iso.org/iso/foreword.html.
This document was prepared by ISO/IEC JTC 1, Information technology, SC 39, Sustainability for and
by Information Technology.
A list of all the parts in the ISO 30134- series can be found on the ISO website.

---------------------- Page: 2 ----------------------
Introduction
The global economy is now reliant on information and communication technologies and the
associated generation, transmission, dissemination, computation and storage of digital data. All
markets have experienced exponential growth in that data, for social, educational and business
sectors and, whilst the internet backbone carries the traffic there are a wide variety of data centres
at nodes and hubs within both private enterprise and shared/collocation facilities.
The historical data generation growth rate exceeds the capacity growth rate of the information and
communications technology hardware and, with less than half (in 2014) of the world's population
having access to an internet connection, that growth in data can only accelerate. In addition, with
many governments having ‘digital agendas‘ to provide both citizens and businesses with ever-
faster broadband access, the very increase in network speed and capacity will, by itself, generate
ever more usage (Jevons Paradox). Data generation and the consequential increase in data
manipulation and storage are directly linked to increasing power consumption.
With this background it is clear that data centre growth, and power consumption in particular, is
an inevitable consequence and that growth will demand increasing power consumption despite the
most stringent energy efficiency strategies. This makes the need for Key Performance Indicators
(KPIs) that cover the effective use of resources (including but not limited to energy) and the
reduction of CO emissions essential.
2
In order to determine the overall resource effectiveness or efficiency of a data centre, a holistic
suite of metrics is required. For the resource effectiveness or efficiency of data centre
infrastructure, power usage effectiveness (PUE) was defined as ISO/IEC 30134-2. PUE will be
utilized to measure and improve energy efficiency of data centre infrastructure, such as cooling
systems and power supply systems. For data centres which own not only infrastructure but also IT
equipment, it is also necessary to measure and improve resource effectiveness or efficiency of IT
equipment. A data centre, which provides only infrastructure to the customer, can be called a co-
location data centre or housing service provider. For these data centres, PUE is essential. However,
a data centre which owns and provides a server, storage, and network equipment is called a hosting
or cloud service provider. These service providers can manage IT equipment and improve resource
effectiveness or efficiency of a data centre by improving energy effectiveness or efficiency of IT
equipment which they own. This document specifies the IT Equipment Energy Efficiency for
servers (ITEEsv) in a data centre which specifies a method for measuring the energy effectiveness
or efficiency of server equipment in a data centre. A data centre which owns servers can use this
document to determine the energy effectiveness or efficiency of their current server equipment
and to improve energy effectiveness or efficiency by including energy effectiveness or efficiency in
their procurement requirements when replacing servers or expanding server capacity. IT
equipment installed in a data centre consists of servers, storage systems, and network equipment.
But it is difficult to calculate the summarized value of the energy effectiveness or efficiency among
different types of IT equipment since the metrics for measuring their performance are different
and simple addition or average is not an appropriate method for summarizing. ITEEsv defines the
method to obtain average energy effectiveness or efficiency for servers.
This document is part of a series of International Standards for such KPIs and has been produced
in accordance with ISO/IEC 30134-1, which defines common requirements for a holistic suite of
KPIs for data centre resource usage effectiveness or efficiency.
The ISO/IEC 30134- series does not specify limits or targets for any KPI and does not describe or
imply, unless specifically stated, any form of aggregation of individual KPIs into a combined nor an
overall KPI for data centre resource usage effectiveness or efficiency.

---------------------- Page: 3 ----------------------
Information Technology — Data Centres — Key Performance Indicators — Part 4: IT
Equipment Energy Efficiency for Servers (ITEEsv)
1 Scope
This document specifies Information Technology Equipment Energy Efficiency for servers
(ITEEsv), a key performance indicator (KPI) which quantifies the energy efficiency characteristics
of servers in a data centre. ITEEsv can be calculated using a choice of pre-existing or context specific
server performance benchmarks. ITEEsv intends to assist in improving the aggregate energy
effectiveness of servers in a given data centre.
This document:
a) defines ITEEsv;
b) describes the purpose of ITEEsv;
c) describes how to use ITEEsv;
d) describes reporting of ITEEsv.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
ISO/IEC 30134-1:2016, Information technology — Data centres — Key performance indicators —
Part 1: Overview and general requirements
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 30134-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
Information Technology Equipment Energy Efficiency for servers
ITEEsv
maximum performance per kW of all servers or a group of servers in a data centre
3.1.2
server
functional unit that provides services to workstations, to personal computers or to other functional
units in a computer network
Note 1 to entry: Services may be dedicated services or shared services.

---------------------- Page: 4 ----------------------
[SOURCE: IEC 60050-732:2010, 732-01-12, modified: Note 2 deleted]
3.2 Abbreviated terms
For the purposes of this document the abbreviated terms given in ISO/IEC 30134-1 and the
following apply:
CPU Central Processing Unit
Formatted Table
ITEEsv IT Equipment Energy Efficiency for servers
SERT Server Efficiency Rating Tool
SMPE Server Maximum Performance
SMPO Server Maximum Power
4 Relevance of ITEEsv
ITEEsv is a KPI which describes the maximum performance per kW of all servers or a group of
servers in the data centre based upon a specification or potential performance of these servers.
ITEEsv reflects the energy effectiveness capability of servers, not the energy effectiveness at a real
operating situation of the servers.
Server energy effectiveness or efficiency is a combination of
a) the capacity to do work per unit energy (capability);
b) the amount of time the server is actually doing work (utilization);
c) the ability of the server to reduce the energy use when the workload is reduced (power
management).
ITEEsv accounts for capability [list item a)] and is used to quantify the effects of introducing servers
1
which have high capability per unit energy. The other aspects are addressed in ISO/IEC 30134-5 .
Data centres with larger ITEEsv values, indicate, on average, installation of servers with higher
energy effectiveness or efficiency.
NOTE ITEEsv does not involve data centre infrastructure such as air conditioning, or operation of IT
equipment. IT equipment in the data centre includes servers, storage systems, and network equipment.
ITEEsv only addresses servers.
ITEEsv is a KPI intended for self-improvement of a given data centre or a part of a data centre, not
for comparison among different data centres. ITEEsv should not be used to set regulation for a data
centre or individual server.
5 Determination of ITEEsv
ITEEsv shall be determined and described by Formula (1).
n
 SMPE
 i
i1
ITEEsv    (1)
n
 SMPO
 i
i1

1
To be published.

---------------------- Page: 5 ----------------------
where

SMPE is maximum performance of a server i,
i
  The SMPEi value is the maximum or peak performance of a server i. SMPEi shall be obtained either
from performance benchmark results provided by the manufacturer or from direct measurement
where the benchmark meets the requirements of 6.2.
  NOTE   Options for the performance benchmark method are explained in A.2. The unit of SMPE
i
depends on a benchmark method applied.
 SMPOi is maximum power consumption of a server i in kW.
  (1) The SMPO value is the maximum power consumption of a server. SMPO shall be obtained either
i i
Formatted: Table body, Justified, No bullets or
from the use of a power consumption data provided by the manufacturer or from direct
numbering, Don't adjust space between Latin and Asian
measurement. SMPOi shall represent the average power used during the benchmark execution which
text, Don't adjust space between Asian text and numbers
obtained its corresponding SMPE value. Options for measurement of SMPO are explained in A.3 and
i i
levels of ITEEsv by these options are explained in Annex B.
Formatted: Default Paragraph Font
  NOTE   The maximum value of server energy effectiveness varies among CPU architectures and
Formatted: cite_sec
workloads, but is often achieved at high CPU load levels. However, only a few benchmarks, such as
SERT and SPECpower, can find the approximate maximum server energy effectiveness. Most of the
benchmark methods reveal the maximum performance (SMPE) and the maximum power
consumption (SMPO) of a server. As an alternative indicator to real maximum server energy
effectiveness, ITEEsv is calculated as maximum performance divided by maximum power
consumption.
ITEEsv is an average of the energy effectiveness of all servers or a group of servers in a data centre.
A higher ITEEsv value indicates higher processing capacity per unit of electric power (at maximum
power). ITEEsv can be improved by utilizing servers with higher energy effectiveness.
6 Determination of SMPE and SMPO for ITEEsv
6.1 General
When using the benchmark method to determine SMPE and SMPO, the benchmark should
represent the application of the servers being tested. For ITEEsv calculation, one benchmark
method should be applied for all servers, and benchmark methods shall not be mixed. If one
benchmark method is not appropriate for all servers due to a difference in server type,
configurations, or intended loads, then servers should be grouped so that one benchmark method
can be applied. Then the ITEEsv of the servers in a group shall be calculated. ITEEsv should not be
added among these groups. If SMPE and SMPO cannot be accurately determined for any particular
servers in a group, those servers shall not be included in the calculation of ITEEsv. When comparing
historical ITEEsv values of a given data centre, the same benchmark method shall be used every
time ITEEsv is measured.
Data centre owners/operators are advised to appropriately and carefully choose the benchmark
method based on the following criteria according to the situation in the data centre they operate.
When a benchmark method is used to calculate ITEEsv, the selected benchmark shall meet the
requirements in 6.2 and should meet the recommendations in 6.3.
NOTE: Calculation examples of ITEEsv are shown in Annex C.
Formatted: English (United Kingdom)
Formatted: English (United Kingdom)
6.2 ITEEsv benchmark method selection requirements
Formatted: cite_sec, English (United Kingdom)
Benchmarks used to calculate ITEEsv shall have:
Formatted: cite_sec, English (United Kingdom)
— an SMPO that is collected using a precise and highly reproducible power and performance
Formatted: English (United Kingdom)
measurement methodology such as those referenced in A.3;

---------------------- Page: 6 ----------------------
— a run to run variation of effectiveness score of ≤ 5%;
— workloads with a high correlation to server power consumption;
— a benchmark that measures and reports power and performance during execution of included
workloads;
— a benchmark that is a generally accepted tool or its results are used for the class of server being
tested.
6.3 ITEEsv benchmark method selection recommendations
Benchmarks used to calculate ITEEsv should:
— be portable across major hardware architectures and operating systems;
— have an execution time of a full run of less than six hours;
— measure or represent real world workloads;
— include end-to-end automation;
— specify and automatically collect configuration details needed to reproduce results;
— provide run rules and software infrastructure for precise performance and power
measurement;
— be publically available worldwide;
— include developers committed to providing timely support and updates for the foreseeable
future;
— include a level of tamper protection and a log file for audit purposes;
— have open and transparent design guidelines, implementation, and result calculations;
— have full documentation available to enable unfamiliar parties to collect accurate results;
— not require extensive optimization expertise to obtain optimal results;
— perform output validation to ensure all s
...

INTERNATIONAL ISO/IEC
STANDARD 30134-4
First edition
2017-10
Information technology — Data
centres — Key performance
indicators —
Part 4:
IT Equipment Energy Efficiency for
servers (ITEEsv)
Technologies de l'information — Centres de traitement de données —
Indicateurs de performance clés —
Partie 4: Efficacité énergétique des appareils de technologies de
l'information (TI) concernant les serveurs
Reference number
ISO/IEC 30134-4:2017(E)
©
ISO/IEC 2017

---------------------- Page: 1 ----------------------
ISO/IEC 30134-4:2017(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO/IEC 2017 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/IEC 30134-4:2017(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Abbreviated terms . 2
4 Relevance of ITEEsv . 2
5 Determination of ITEEsv . 3
6 Determination of SMPE and SMPO for ITEEsv . 3
6.1 General . 3
6.2 ITEEsv benchmark method selection requirements . 4
6.3 ITEEsv benchmark method selection recommendations . 4
7 Direction for use of ITEEsv . 4
8 Reporting of ITEEsv . 5
8.1 Requirements . 5
8.2 Recommendations . 6
Annex A (informative) Options for determining SMPE and SMPO . 7
Annex B (normative) Levels of ITEEsv .10
Annex C (informative) Examples of ITEEsv calculation .11
Bibliography .12
© ISO/IEC 2017 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/IEC 30134-4:2017(E)

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical
activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work. In the field of information technology, ISO and IEC have established a joint technical committee,
ISO/IEC JTC 1.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for
the different types of document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by ISO/IEC JTC 1, Information technology, SC 39, Sustainability for and by
Information Technology.
A list of all the parts in the ISO 30134- series can be found on the ISO website.
iv © ISO/IEC 2017 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/IEC 30134-4:2017(E)

Introduction
The global economy is now reliant on information and communication technologies and the associated
generation, transmission, dissemination, computation and storage of digital data. All markets have
experienced exponential growth in that data, for social, educational and business sectors and, whilst
the internet backbone carries the traffic there are a wide variety of data centres at nodes and hubs
within both private enterprise and shared/collocation facilities.
The historical data generation growth rate exceeds the capacity growth rate of the information and
communications technology hardware and, with less than half (in 2014) of the world's population
having access to an internet connection, that growth in data can only accelerate. In addition, with
many governments having ‘digital agendas‘ to provide both citizens and businesses with ever-faster
broadband access, the very increase in network speed and capacity will, by itself, generate ever more
usage (Jevons Paradox). Data generation and the consequential increase in data manipulation and
storage are directly linked to increasing power consumption.
With this background it is clear that data centre growth, and power consumption in particular, is an
inevitable consequence and that growth will demand increasing power consumption despite the most
stringent energy efficiency strategies. This makes the need for Key Performance Indicators (KPIs)
that cover the effective use of resources (including but not limited to energy) and the reduction of CO
2
emissions essential.
In order to determine the overall resource effectiveness or efficiency of a data centre, a holistic suite
of metrics is required. For the resource effectiveness or efficiency of data centre infrastructure,
power usage effectiveness (PUE) was defined as ISO/IEC 30134-2. PUE will be utilized to measure and
improve energy efficiency of data centre infrastructure, such as cooling systems and power supply
systems. For data centres which own not only infrastructure but also IT equipment, it is also necessary
to measure and improve resource effectiveness or efficiency of IT equipment. A data centre, which
provides only infrastructure to the customer, can be called a co-location data centre or housing service
provider. For these data centres, PUE is essential. However, a data centre which owns and provides
a server, storage, and network equipment is called a hosting or cloud service provider. These service
providers can manage IT equipment and improve resource effectiveness or efficiency of a data centre by
improving energy effectiveness or efficiency of IT equipment which they own. This document specifies
the IT Equipment Energy Efficiency for servers (ITEEsv) in a data centre which specifies a method for
measuring the energy effectiveness or efficiency of server equipment in a data centre. A data centre
which owns servers can use this document to determine the energy effectiveness or efficiency of
their current server equipment and to improve energy effectiveness or efficiency by including energy
effectiveness or efficiency in their procurement requirements when replacing servers or expanding
server capacity. IT equipment installed in a data centre consists of servers, storage systems, and
network equipment. But it is difficult to calculate the summarized value of the energy effectiveness or
efficiency among different types of IT equipment since the metrics for measuring their performance are
different and simple addition or average is not an appropriate method for summarizing. ITEEsv defines
the method to obtain average energy effectiveness or efficiency for servers.
This document is part of a series of International Standards for such KPIs and has been produced in
accordance with ISO/IEC 30134-1, which defines common requirements for a holistic suite of KPIs for
data centre resource usage effectiveness or efficiency.
The ISO/IEC 30134- series does not specify limits or targets for any KPI and does not describe or imply,
unless specifically stated, any form of aggregation of individual KPIs into a combined nor an overall KPI
for data centre resource usage effectiveness or efficiency.
© ISO/IEC 2017 – All rights reserved v

---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO/IEC 30134-4:2017(E)
Information technology — Data centres — Key
performance indicators —
Part 4:
IT Equipment Energy Efficiency for servers (ITEEsv)
1 Scope
This document specifies Information Technology Equipment Energy Efficiency for servers (ITEEsv),
a key performance indicator (KPI) which quantifies the energy efficiency characteristics of servers
in a data centre. ITEEsv can be calculated using a choice of pre-existing or context specific server
performance benchmarks. ITEEsv intends to assist in improving the aggregate energy effectiveness of
servers in a given data centre.
This document:
a) defines ITEEsv;
b) describes the purpose of ITEEsv;
c) describes how to use ITEEsv;
d) describes reporting of ITEEsv.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 30134-1:2016, Information technology — Data centres — Key performance indicators — Part 1:
Overview and general requirements
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 30134-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
Information Technology Equipment Energy Efficiency for servers
ITEEsv
maximum performance per kW of all servers or a group of servers in a data centre
© ISO/IEC 2017 – All rights reserved 1

---------------------- Page: 6 ----------------------
ISO/IEC 30134-4:2017(E)

3.1.2
server
functional unit that provides services to workstations, to personal computers or to other functional
units in a computer network
Note 1 to entry: Services may be dedicated services or shared services.
[SOURCE: IEC 60050-732:2010, 732-01-12, modified: Note 2 deleted]
3.2 Abbreviated terms
For the purposes of this document the abbreviated terms given in ISO/IEC 30134-1 and the
following apply:
CPU Central Processing Unit
ITEEsv IT Equipment Energy Efficiency for servers
SERT Server Efficiency Rating Tool
SMPE Server Maximum Performance
SMPO Server Maximum Power
4 Relevance of ITEEsv
ITEEsv is a KPI which describes the maximum performance per kW of all servers or a group of servers
in the data centre based upon a specification or potential performance of these servers. ITEEsv reflects
the energy effectiveness capability of servers, not the energy effectiveness at a real operating situation
of the servers.
Server energy effectiveness or efficiency is a combination of
a) the capacity to do work per unit energy (capability);
b) the amount of time the server is actually doing work (utilization);
c) the ability of the server to reduce the energy use when the workload is reduced (power
management).
ITEEsv accounts for capability [list item a)] and is used to quantify the effects of introducing servers
which have high capability per unit energy. The other aspects are addressed in ISO/IEC 30134-5. Data
centres with larger ITEEsv values, indicate, on average, installation of servers with higher energy
effectiveness or efficiency.
NOTE ITEEsv does not involve data centre infrastructure such as air conditioning, or operation of IT
equipment. IT equipment in the data centre includes servers, storage systems, and network equipment. ITEEsv
only addresses servers.
ITEEsv is a KPI intended for self-improvement of a given data centre or a part of a data centre, not for
comparison among different data centres. ITEEsv should not be used to set regulation for a data centre
or individual server.
2 © ISO/IEC 2017 – All rights reserved

---------------------- Page: 7 ----------------------
ISO/IEC 30134-4:2017(E)

5 Determination of ITEEsv
ITEEsv shall be determined and described by Formula (1).
n
�SMPE
i
∑
i=1
ITEEsv = � (1)
n
�SMPO
i
∑
i=1
where
SMPE is maximum performance of a server i,
i
 The SMPE value is the maximum or peak performance of a server i. SMPE shall be obtained
i i
either from performance benchmark results provided by the manufacturer or from direct
measurement where the benchmark meets the requirements of 6.2.
 NOTE   Options for the performance benchmark method are explained in A.2. The unit of
SMPE depends on a benchmark method applied.
i
SMPO is maximum power consumption of a server i in kW.
i
 The SMPO value is the maximum power consumption of a server. SMPO shall be obtained
i i
either from the use of a power consumption data provided by the manufacturer or from
direct measurement. SMPO shall represent the average power used during the benchmark
i
execution which obtained its corresponding SMPE value. Options for measurement of SMPO
i i
are explained in A.3 and levels of ITEEsv by these options are explained in Annex B.
 NOTE   The maximum value of server energy effectiveness varies among CPU architectures
and workloads, but is often achieved at high CPU load levels. However, only a few bench-
marks, such as SERT and SPECpower, can find the approximate maximum server energy
effectiveness. Most of the benchmark methods reveal the maximum performance (SMPE)
and the maximum power consumption (SMPO) of a server. As an alternative indicator to
real maximum server energy effectiveness, ITEEsv is calculated as maximum performance
divided by maximum power consumption.
ITEEsv is an average of the energy effectiveness of all servers or a group of servers in a data centre.
A higher ITEEsv value indicates higher processing capacity per unit of electric power (at maximum
power). ITEEsv can be improved by utilizing servers with higher energy effectiveness.
6 Determination of SMPE and SMPO for ITEEsv
6.1 General
When using the benchmark method to determine SMPE and SMPO, the benchmark should represent
the application of the servers being tested. For ITEEsv calculation, one benchmark method should be
applied for all servers, and benchmark methods shall not be mixed. If one benchmark method is not
appropriate for all servers due to a difference in server type, configurations, or intended loads, then
servers should be grouped so that one benchmark method can be applied. Then the ITEEsv of the
servers in a group shall be calculated. ITEEsv should not be added among these groups. If SMPE and
SMPO cannot be accurately determined for any particular servers in a group, those servers shall not be
included in the calculation of ITEEsv. When comparing historical ITEEsv values of a given data centre,
the same benchmark method shall be used every time ITE
...