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1 BPSDC (Data Center Networks & Cloud Computing Security) Lecture 3 Data Center Standars
2 Service Level Agreement 2
3 Building a Data Center is just a Start What is Service Level Agreement (SLA)? An official commitment between the service provider and a client Can be a legally binding formal or an informal "contract" Originally used by fixed line telco operators from 1980s Commonly includes several components, from a definition of the services to the termination of the agreement Definition of type of service to be provided The service's desired performance level (+ reliability and responsiveness) Monitoring process and service level reporting Steps for reporting issues with the service Response and issue resolution time-frame Repercussions for service provider not meeting 3 commitment, especially financial
4 Where and how does SLA apply? Where are we able to find SLA? Backbone Internet Providers Web services e.g. the availability of REST API to customers Data Centers (both shared, on-premise and outsourced) Cloud computing shared resources SLA Example SLA (one of the Czech/Itallian Providers) 100% uptime for power and cooling 99,95% Internet connectivity 99,95% physical node availability for Virt. infrastructure Servers 99,8% access to provided physical nodes 4
5 What does SLA not cover? Higher power aka act of God aka Force Majeure wars, terrorism, strikes, traffic accidents, sometimes also natural disasters (see previous lecture) Extraordinary interventions to be carried out urgently to avoid hazards to safety/stability/confidentiality/integrity typically announced in advance to customers (e.g. 48h before execution when possible or ASAP) Unavailability or blocking of the infrastructure due to Customer actions (shutdown of servers, abuse, misconf.) 3rd party OS or applications used non-fulfillment or breach of Contract by customer Internet or connectivity problems caused by customer or 3rd parties 5 Planned maintenance (normal amount)
6 Data Center Standards 6
7 A Data Center must follow some Guidelines/Best practices ANSI/BICSI 002, Data Center Design and Implementation Best Practices (USA International) Standards TIA 942 (USA) ISO/IEC ISO/IEC (Worldwide) EN series (WiP) + EN (EU) Certification requirements Uptime Institute Tier certification (Worldwide) 7
8 Building Industry Consulting Service International 002 DC Design and Implementation Best Practices (1) Site selection hazards, environments, access, regulations Space planning capacity, power, cooling, supporting spaces, IT Equipment placement, network Architectural design concepts, access paths, planning details, construction components Structural general, specific Mechanical classes, cooling conditions, thermal, mech., Electrical systems utility serv., distribution, mechanical, UPS, standby and Emergency, Automation & Control, Lighting, Protection, Fire Protection walls, floors, ceilings, aisle containment, extinguishers, protection, detection, DC Management and Building Systems building automation systems, electronic safety and security systems 8
9 Building Industry Consulting Service International 002 DC Design and Implementation Best Practices (2) Security physical s. plan, risks & threats, regulatory & insurance, DC security plan, crime prevention, access control, alarms, barriers, lighting, surveillance, guards, disaster recovery, building site considerations, building shell, DC security Telecommunications, Cabling, Infrastructure, Pathways, Spaces C0-C4 Cabling class, topologies, spaces, pathways, access providers Backbone & horizontal c. Installation, testing, racks Information Technology disaster recovery, c. room layout, communication, operations center, network infrastructure reliability, security Commissioning (+testing) Maintenance (of all systems) Annexes (informative) Design Process Reliability & Availability Alignment, Outsourcing 9 Multi-DC arch., energy efficiency
10 BICSI 002 Annex B Operational Requirements Operational Level Annual Planned Downtime 0 > 400 h h h h 4 0h Description Operational less than 24 hours a day & less than 7 days a week. Scheduled maintenance down time available during working hours and off hours. As above. Operational up to 24 hours a day, up to 7 days a week, and up to 50 weeks per year. Scheduled maintenance down time as above. Functions are operational 24 hours a day, 7 days a week for 50 weeks or more. No sch. maintenance down time is available during working hours Functions are operational 24 hours a day, 7 days a week for 52 weeks each year. No scheduled 10 maintenance down time is available
11 BICSI 002 Annex B Downtime Impact Description Local in scope, affecting only a single function or operation, resulting in a minor disruption or delay in achieving non critical organizational objectives Local in scope, affecting only a single site, or resulting in a minor disruption or delay in achieving key organizational objectives Regional in scope, affecting a portion of the enterprise or resulting in a moderate disruption or delay in achieving key organizational objectives Multiregional in scope, affecting a major portion of the enterprise or resulting in a major disruption or delay in achieving key organizational objectives Affecting the quality of service delivery across the entire enterprise, or resulting in a significant disruption or delay in achieving key organizational objectives Classification (Impact) Isolated (Sub-Local) Minor (Local) Major (Regional) Severe (Multiregional) Catastrophic (Enterprise) 11
12 BICSI 002 Annex B Data Centre Class Facility Availability Classes F0/F1 Single path (maps to T-1, R-1, AC-1) F2 Redundant components (maps to T-2, R-2, AC-2) F3 Concurrent Maintainability (maps to T-3, R-3, AC-3) F4 Fault Tolerant (maps to T-4, R-4, AC-4) 12
13 BICSI 002 Annex B Availability Requirements Allowable Annual Downtime (minutes) > Allowable Availability (Uptime 9s next lecture) > 99% 99% 99.9% 99.9% 99.99% 99.99% % % % 13
14 TIA-942 Telecommunications Infrastructure Standard for Data Centers (1) Specifications for DC telecommunications pathways & spaces Recommendations on media & distance restrictions for structured cabling system and applications over it (2005) Telecommunication spaces and topologies Cabling, pathways, redundancy, Informative annexes: Design, administration, access provider information, equipment plans, dataspace considerations, site selection, tiers, examples, references Components known from TIA-568 Addendum 1 (2008) usage of 75 Ω coaxial cable Addendum 2 (2010) additional guidelines for DCs lighting in 3 tiers, recommendation from CAT-6/6A to CAT-6A only 14 (minimum required category is Cat-6)
15 TIA-942 Telecommunications Infrastructure Standard for Data Centers (2) TIA-942-A (2012) harmonization with TIA-568C left some limitations to other standards (removed from here) removed 100m limitation for optical fibers multi-mode cable possible for horizontal & backbone cabling use of LC & MPO connectors for optical fibers Introduced Intermediate Distribution Area (IDA) Zone Distribution Area (ZD) can contain only passive components energy efficiency recommendations, harmonized with IEC TIA-942-A Addendum 1 (2013) mainly data center fabric topologies examples, new switch topologies Fat tree, full mesh, inter-connected meshes, Centralized switch, virtual switch 15
16 TIA-942 Telecommunications Infrastructure Standard for Data Centers (3) TIA-942 Revision B (2017) Added Cat-8 cabling, recommended cabling Cat-6A or higher Maximum EDA cable length 10 7m at least 1200mm deep cabinets, considerations for 24 + (600mm+) cabinets, pre-terminated cabling, labeling, cable routing, adding/removing cords, MPO-16 and MPO-32 connectors for 200G and 400G Wideband multimode fiber (WBMMF) cable added ANSI/TIA-568-C.4 coaxial cables and F connectors may be used Normative references to other standards, including revised references to temperature and humidity guidelines Modifications for use outside of US, optical cable quality req. 16
17 TIA-942 Ratings of Data Centres (1) Rated-1: Basic Site Infrastructure Single capacity components and a single, non-redundant distribution path serving the computer equipment. Limited protection against physical events May not even have a raised floor Susceptible to disruption from planned & unplanned activities 28.8 hours of annual downtime permissible 1 entrance pathway from access provider to facility, single pathway for all cabling 17
18 TIA-942 Ratings of Data Centres (2) Rated-2: Redundant Capacity Component Site Infrastructure Redundant capacity components and a single, non-redundant distribution path serving the computer equipment. Improved protection against physical events Does have to use a raised floor Slightly less susceptible to disruptions 22.0 hours of annual downtime permissible Requirements of Rated-2 must be observed, also 2 entrance pathways from access provider to facility exist Routers & switches have redundant power supplies & processors Vulnerability of service entering building is addressed N+1 redundant UPS modules, single generator 18
19 TIA-942 Ratings of Data Centres (3) Rated-3: Concurrently Maintainable Site Infrastructure Redundant capacity components and multiple independent distribution paths serving the computer equipment (power, data, cooling). N+1 rule for everything. Typically, one single distribution path serves the computer equipment at any time. Protection against most physical events The site is concurrently maintainable each & every capacity component incl. elements which are part of the distribution path, can be removed/replaced/serviced on a planned basis without disrupting the ICT capabilities to the End-User. 1.6 hours of annual downtime Requirements of Rated-2 must be observed, also requires at least 2 access providers + a secondary entrance room backbone pathways have to be redundant multiple routers and switches must be included for redundancy Vulnerability of a single access provider is addressed 19
20 TIA-942 Ratings of Data Centres (4) Rated-4: Fault Tolerant Site Infrastructure Redundant capacity components and multiple independent distribution paths serving the computer equipment. All redundant capacity components and independent distribution paths are active at the same time. 2(N+1) for all components Protection against almost all physical events. The data center allows concurrent maintainability and one fault anywhere in the installation without causing downtime. All computer hardware must have dual power inputs Can sustain at least one worst-case, unplanned failure or event with no critical load impact 0.4 hours (18 minutes) of annual downtime Requirements of Rated-3 must be observed, also requires redundant backbone cabling, which should be in conduit or have interlocking armor, optional secondary distribution area optionally, horizontal cabling is also redundant 20 Addresses any vulnerability of the cabling infrastructure
21 ISO/IEC Generic Cabling for Customer Premises Part 5: Data centers (1) Latest revision ISO/IEC :2017 Balanced & optical fibre cabling specifications, normative parts: Structure of the generic cabling system Channel performance requirements Link performance requirements Reference implementations Cable requirements Connecting hardware requirements Requirements for cords and jumpers Annex A - Combination of balanced cabling links 21
22 ISO/IEC Generic Cabling for Customer Premises Part 5: Data centers (2) Informative Annexes (optional): Usage of high density connecting hardware within optical fibre cabling Examples of structures in accordance with ISO/IEC Data center minimum configuration End of Row concept Middle of Row concept Top of Rack concept End of Row and Middle of Row concept with redundancy Top of Rack concept with redundancy End of Row and Middle of Row concept with full redundancy Top of Rack concept with (full) redundancy Examples of networking fabric architectures: fat-tree, full-mesh, 22 interconnected meshes, centralized switch, virtual switch
23 ISO/IEC Cabling Cable classes Twisted pair (100 Ω impedance) Class EA: link/channel up to 500 MHz Cat-6A cable/connectors Class F: link/channel up to 600 MHz using Cat-7 cable/connectors Class FA: link/channel up to 1000 MHz using Category 7A Class I/II: link/channel up between to 1600 and 2000 MHz using Category 8.1/8.2 cable/connectors 2-4 mated connectors per copper channel, RJ-45 or TERA connector Optical fiber interconnect using multi-mode fibre OM3: Multimode fiber 50µm, min. modal bw of 2000 MHz*km at 850 nm OM4: Multimode fiber 50µm, min. modal bw of 4700 MHz*km at 850 nm OS1/OS2: Single-mode fiber type 1 db/km / 0.4 db/km attenuation duplex LC (2 fibers) or MPO (3+ fibers) connector Channel length is determined by media choice 23
24 ISO/IEC Data Centre Topologies Fat tree without port extenders Standard 3-tiered architecture Port extenders Full mesh 24 Interconnected meshes
25 EN IT Generic cabling systems Part 5: Data centres Structure of the generic cabling system in data centres Channel performance in data centres Reference implementations in data centres Cable requirements in data centres Connecting hardware requirements in data centres Requirements for cords and jumpers in data centres 25
26 EN series IT Data centre facilities and infrastructures EN General concepts EN Building construction EN Power distribution EN Environmental control EN Telecommunications cabling infrastructure EN Security systems EN Management and operational information EN Overview of and general requirements for key performance indicators EN Power Usage Effectiveness 26 EN Renewable Energy Factor
27 EN Security Systems Physical security general, risk assessment Designation of data centre spaces - Protection Classes Protection Class against unauthorized access Protection Class against fire events igniting within data centre spaces Protection Class against environmental events (other than fire) within data centre spaces Protection Class against environmental events outside the data centre spaces Systems to prevent unauthorized access Informative Annex Pressure relief: Additional information 27
28 EN Availability classes 28
29 EN Protection classes 29
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