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WHAT IS A DATA CENTER
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An application delivery data center in this context is a central site or location that houses the application and desktop delivery infrastructure for a company This site is characterized by limited physical access, superior network capacity, power capacity, power quality, and a degree of internal redundancy for these computing resources In the following sections, we present some important considerations in designing, building, and running a centralized data center environment utilizing the latest Citrix technology
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DESIGNING A DATA CENTER APPLICATION DELIVERY PLATFORM: OVERALL CONSIDERATIONS
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For the purposes of this chapter, the design of the datacenter must encompass and service two key areas: Facilities Data center network infrastructure
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Both of these key areas can be serviced by your organization internally (using internal resources and facilities) or externally by service providers who provide these services and facilities in an outsourced arrangement to your organization You will want to
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perform an assessment of your ability to host and/or manage a data center using some of the criteria presented in this chapter Let s look more closely at the advantages and limitations of outsourcing a data center Here are the potential advantages of outsourcing: Facilities built specifically for data center hosting already exist, and in fact, many data hosting facilities currently have excess capacity Thus, new construction is rarely necessary Redundant power sources, such as UPS systems, backup generators with automatic transfer switches (ATSs), redundant power grids, online as well as backup cooling systems, intruder detection systems, secure access, and fire suppression are often already in place and can be leveraged across multiple organizations, reducing the cost to each individual organization Physical security is usually better than the individual companies internal security Guards on duty, biometric authentication, escorted access, and other measures are typical Hosting facilities are often built very close to the points of presence (POPs) of a local exchange carrier (LEC) In some cases, they are built into the same location as an LEC, which can dramatically decrease WAN communication costs Managed services that can supplement a company s existing staff are usually available These services are invariably less expensive than hiring someone to perform routine operations such as exchanging tapes and rebooting servers Hosting facilities typically are SAS 70 certified and carry liability insurance, which can help with compliance and often can have a significant impact on the cost of business-continuity insurance Many facilities can customize the service-level agreement they offer or bundle hosting services with network telecommunication services
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Limitations of outsourcing include the following: A company s access to its equipment is usually restricted or monitored Outsourcing puts further demands on the design to create an operation that can run unattended WAN connectivity is limited to what the hosting center has available It can be more difficult to get upgraded bandwidth because the hosting center has to filter such requests through the plans in place for the entire facility It may be more difficult to get internal approval to outsource the expense because the hosting services appear as a bottom-line cost, whereas many information technology costs are buried in other areas, such as facilities and telecommunications If unmanaged space is obtained, it may be difficult or impractical for a company to have one of its own staff onsite at the hosting facility for extended periods of time
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Facilities Power, HVAC, Fire Suppression, and Physical Security
Statically, downtime due to facilities problems (power, HVAC, fire, and physical security) has dropped dramatically over the last ten years, as large UPSs, generators, and water-free fire suppression solutions have become commonplace That said, though, all of these items require management, maintenance, and monitoring It is important to have a process to ensure that the management and monitoring is in place (even it is outsourced) If you are considering building a new data center or getting a new outsourcing arrangement, the following sections should help in determining the size and costing requirements for power, HVAC, and fire suppression
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