CLC/TS 50600-4-31:2024

SLOVENSKI STANDARD
01-december-2024
Informacijska tehnologija - Objekti in infrastrukture podatkovnega centra – 4-31.
del: Ključni kazalniki uspešnosti za odpornost
Information technology - Data centre facilities and infrastructures - Part 4-31: Key
performance indicators for Resilience
Informationstechnik - Einrichtungen und Infrastrukturen von Rechenzentren - Teil 4-31:
Leistungskennzahlen für die Ausfallsicherheit
Technologie de l’information - Installation et infrastructures de centres de traitement de
données - Partie 4-31: Indicateurs-clés de performance pour la résilience
Ta slovenski standard je istoveten z: CLC/TS 50600-4-31:2024
ICS:
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
35.110 Omreževanje Networking
35.160 Mikroprocesorski sistemi Microprocessor systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION CLC/TS 50600-4-31

SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION October 2024
ICS 35.020; 35.110; 35.160
English Version
Information technology - Data centre facilities and infrastructures
- Part 4-31: Key performance indicators for Resilience
Technologie de l'information - Installation et infrastructures Informationstechnik - Einrichtungen und Infrastrukturen von
de centres de traitement de données - Partie 4-31: Rechenzentren - Teil 4-31: Leistungskennzahlen für die
Indicateurs-clés de performance pour la résilience Resilienz
This Technical Specification was approved by CENELEC on 2024-09-02.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TS 50600-4-31:2024 E

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, abbreviations and symbols . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 12
3.3 Symbols . 12
4 Area of application . 14
4.1 General . 14
4.2 DCI service definition . 14
5 Resilience considerations as part of the life cycle . 15
5.1 Implementation in the design process . 15
5.2 Documentation during operation . 17
5.3 Documentation of resilience level . 17
5.4 Documentation of dependability . 18
5.5 Documentation of fault tolerance . 18
5.6 Documentation of availability tolerance . 18
6 Determination of KPIs for resilience . 18
6.1 General . 18
6.2 Structuring of the KPIs for resilience . 19
6.3 Dependability . 21
6.4 Fault tolerance . 25
6.5 Availability tolerance . 26
6.6 Resilience level . 27
6.7 Application to data centre infrastructures . 30
Annex A (informative) Failure Mode Effects and Criticality Analysis . 33
Annex B (informative) Dependability data . 35
Annex C (informative) Resilience analysis for data centre infrastructures . 52
Annex D (informative) SPoF Analysis for DCIs . 57
Annex E (informative) Resilience level analysis for DCIs . 61
Annex F (informative) Interval of confidence . 63
F.1 Overview. 63
F.2 Estimation of the mean failure rate . 63
F.3 Estimation of the boundaries of the failure rate . 63
F.4 Case when no failure has appeared . 64
F.4.1 General . 64
F.4.2 Example 1 . 64
F.4.3 Example 2 . 65
Bibliography . 66
European foreword
This document (CLC/TS 50600-4-31:2024) has been prepared by CLC/TC 215, “Electrotechnical aspects of
telecommunication equipment”.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is based on, but not identical to, ISO/IEC TS 22237-31:2023.
This document has been prepared under a standardization request addressed to CENELEC by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
Any feedback and questions on this document should be directed to the users’ national committee. A complete
listing of these bodies can be found on the CENELEC website.

Introduction
The unrestricted access to internet-based information demanded by the information society has led to an
exponential growth of both internet traffic and the volume of stored/retrieved data. Data centres are housing and
supporting the information technology and network telecommunications equipment for data processing, data
storage and data transport. They are required both by network operators (delivering those services to customer
premises) and by enterprises within those customer premises.
Data centres usually provide modular, scalable and flexible facilities and infrastructures to easily accommodate
the rapidly changing requirements of the market. In addition, energy consumption of data centres has become
critical both from an environmental point of view (reduction of environmental footprint) and with respect to
economical considerations (cost of energy) for the data centre operator.
The implementation of data centres varies in terms of:
a) purpose (enterprise, co-location, co-hosting or network operator facilities);
b) security level;
c) physical size;
d) accommodation (mobile, temporary and permanent constructions).
The needs of data centres also vary in terms of availability of service, the provision of security and the objectives
for energy efficiency. These needs and objectives influence the design of data centres in terms of building
construction, power distribution, environmental control, telecommunications cabling and physical security as
well as the operation of the data centre. Effective management and operational information are important in
order to monitor achievement of the defined needs and objectives.
Recognizing the substantial resource consumption, particularly of energy, of larger data centres, it is also
important to provide tools for the assessment of that consumption both in terms of overall value and of source
mix and to provide Key Performance Indicators (KPIs) to evaluate trends and drive performance improvements.
At the time of publication of this document, the EN 50600 series is designed as a framework of standards,
technical specifications and technical reports covering the design, the operation and management, the key
performance indicators for energy efficient operation of the data centre as well as a data centre maturity model.
The EN 50600-2 series defines the requirements for the data centre design.
The EN 50600-3 series defines the requirements for the operation and the management of the data centre.
The EN 50600-4 series defines the key performance indicators for the data centre.
The CLC/TS 50600-5 series defines the data centre maturity model requirements and recommendations.
The CLC/TR 50600-99-X Technical Reports cover recommended practices and guidance for specific topics
around data centre operation and design.
This series of documents specifies requirements and recommendations to support the various parties involved
in the design, planning, procurement, integration, installation, operation and maintenance of facilities and
infrastructures within data centres. These parties include:
1) owners, operators, facility managers, ICT managers, project managers, main contractors;
2) consulting engineers, architects, building designers and builders, system and installation designers,
auditors, test and commissioning agents;
3) facility and infrastructure integrators, suppliers of equipment;
4) installers, maintainers.
At the time of publication of this document, the EN 50600-4 series comprises the following documents:
— EN 50600-4-1, Information technology — Data centre facilities and infrastructures — Part 4-1: Overview of
and general requirements for key performance indicators

— EN 50600-4-2, Information technology — Data centre facilities and infrastructures — Part 4-2: Power
Usage Effectiveness
— EN 50600-4-3, Information technology — Data centre facilities and infrastructures — Part 4-3: Renewable
Energy Factor;
— EN 50600-4-6, Information technology — Data centre facilities and infrastructures — Part 4-6: Energy
Reuse Factor;
— EN 50600-4-7, Information technology — Data centre facilities and infrastructures — Part 4-7: Cooling
Efficiency Ratio;
— EN 50600-4-8, Information technology — Data centre facilities and infrastructures — Part 4-8: Carbon
Usage Effectiveness;
— EN 50600-4-9, Information technology — Data centre facilities and infrastructures — Part 4-9: Water
Usage Effectiveness.
The inter-relationship of the documents within the EN 50600 series is shown in Figure 1.

Figure 1 — Schematic relationship between the EN 50600 series documents
EN 50600-2-X documents specify requirements and recommendations for particular facilities and infrastructures
to support the relevant classification for “availability”, “physical security” and “energy efficiency enablement”
selected from EN 50600-1.
EN 50600-3-X documents specify requirements and recommendations for data cen
...