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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 Definitions
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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Data Center Definitions
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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Data Center Architecture
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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Data Center Architecture
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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Data Center Services (3)
IP Infrastructure Service
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Data Center Services (4)
Application Services
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Data Center Services (5)
Security Services
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Data Center Services (6)
Storage Services
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Data Center Services (7)
Business Continuance Infrastructure Service
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Summary
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References
Cisco Press Data Center Fundamentals