introduction data centers

7/27/2019 Introduction Data Centers

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IT4202 NETWORK

AND DATA CENTEROPERATIONS

Lecture 02

Data Centers


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Overview of Data Center

Data Center Definitions

Application Architecture Models

Data Center Architecture

Data Center Services


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Data Center Goals

Data Center Facilities

Roles of Data Centers in Enterprises

Roles of Data Center in the Service Provider

Environment


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A data centeris a facility used to house

computer systems and associated

components, such as telecommunications and

storage systems. It generally includes

redundant or backup power supplies

redundant data communications connections environmental controls (e.g., air conditioning, fire

suppression)

security devices


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Data Center Definitions (2)

Computing resources in Data Centers

Mainframes

Web Application Server

File and Print Servers

Messaging servers

Application Software and the OS that run them

Storage SubsystemsNetwork Infrastructure


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Network Operations and

Applications

Network Time Protocol (NTP)

FTP

Domain Name Systems (DNS)

DHCP

SNMP

TFTP

NFS


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Network Operations and

Applications(2)

Network-Based Application

IP Telephony

Video Streaming over IP

IP video conferencing

Etc.


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Data Center Goals

Figure 1

Data Center (DC)

Goals (Business)

Need to

achieveIT Initiatives Design Criteria of

DC

Functional

Areas of DC

Networks

Generate

Applied to


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Data Center (DC) Goals

(Business)

Resiliency- supports for business operation

around the clock

Total cost of Ownership

lowering the total

cost of operation and the maintenance needed

to sustain the business functions

Flexibility - rapid deployment of application

and consolidation of computing resources


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IT Initiatives

Business Continuance

Increased Security in the Data Center

Application, Server, and Data Center

Consolidation

Integration of Applications whether

Client/Server and multitier (n-tier), or web

services-related applications Storage Consolidation


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Design Criteria of DC

Availability

Scalability

SecurityPerformance

Manageability


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Functional Areas of a DC

Network

Infrastructure Service Routing, Switchingand Server farm architecture

Application Service Load balancing,

Secure Socket Layer (SSL) offloading, andcaching

Security ServicesPacket filtering andinspection, intrusion detection, and intrusion

prevention Storage ServicesSAN Architecture, Fiber

Channel Switching, backup, and archival

Business ContinuanceSAN extension, siteselection and Data Center interconnectivity


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Facilities for Data Center

Power Capacity

Cooling Capacity

Cabling

Temperature and Humidity Controls

Fire and Smoke Systems

Physical Security: restricted access and

surveillance systems Rack Space and Raised Floors


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Role of the DC in the Enterprise

Building Blocks of Typical Enterprise Network

Campus Network

Private WAN

Remote Access

Internet Server Farm

Extranet Server Farm

Intranet Server Farm Figure 1.1 Shows the building blocks of a Data

Center in the Enterprise


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Role of the DC in the Enterprise

(2)

House many components that supports theinfrastructure building blocks

Support wide number of enterprise

applicationsCustomer Relationship Management (CRM)

Enterprise Resource Planning (ERM)

Supply Chain Management (SCM)

Sales Force Automation (SFA)Order Processing

E-Commerce

Internet Data Center (IDC) Data Center inService Provider Environment


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Application Architecture Models

Client/Server Model

n-Tier Model

Multitier Architecture Application Environment


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Client /Server Model

Thick client- a portion of application code

running at the clients computer that has the

responsibility of retrieving data from the server

and presenting it to the client (use applicationGUIs to connect servers)

Thin clients clients connects to server using

a web browser

Classical Client/Server Model consists of

A thick client

A server where the remaining business logic

resides


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Client /Server Model

Figure 2


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n-Tier Model

Most of the clients are thin clients

Tiers - Distinct functions supported by the

servers (Web, Applications and Database

Servers)

Figure 3


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n-Tier Model

Figure 3Thin

Client


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n-Tier Model

Figure 4- n-Tier Model and Maps each tier to

partial list of available technologies in each

tier


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Multitier Architecture Application

Environment

u u


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u uEnvironment


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Aggregation Layer

Access Layer

Front End Segment

Applications Segment

Back End Segment

Storage Layer

Data Center Transport Layer


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Figure 5


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Figure 5 shows fully redundant enterprise Data

Center supporting the following areas

No single point of failure- redundant components

Redundant Data CentersRedundant connection to different service

providers

External and Internal routing through EBGP and

IBGP

Edge Security to Control access from the Internet

Control for access to the Internet from the

enterprise clients


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Aggregation Layer


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Aggregation Layer

Figure 6 shows aggregation and Access

Layers


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Access Layer

Front-End Segment

consists of Layer 2switches, security device and features, and thefront end server farms

Application Segment the same network

infrastructure components as the front-endsegment and the application servers withadditional security

Backend Segment same as two previous

segments, additionally it supports the connectivityto the database servers


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Access Layer (2)

Figure 7


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Storage Layer


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Figure 8


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Data Center Transport Layer


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Data Center Services

IP Infrastructure Services

Application Services

Security Services

Storage Devices

Business Continuance Infrastructure Services


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Data Center Services (2)

Figure 9


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IP Infrastructure Service


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Application Services


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Security Services


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Storage Services


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Business Continuance Infrastructure Service


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Summary


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References

Cisco Press Data Center Fundamentals

introduction data centers

Documents