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  • What are RAID Controllers - RAID Controller Card Information
    hard disk drives with advanced data protection and management functionalities more RAID Controllers and RAID Controller cards Definition A RAID controller is a hardware device responsible for managing physical drives in a system and presenting them to the computer as logical units The setting up of RAID 0 and RAID 1 can be done either via software or hardware Some operating systems allow you to setup RAID in the software itself A better option is to have a dedicated piece of hardware controlling the RAID functions A guide to software RAID in Linux RAID controller chips are often imbedded in the motherboard They also come in the form of a PCI expansion cards Hardware RAID You need to ensure that the RAID controller card is designed for the type of hard disks you are using A RAID controller card designed for use with IDE hard disks will not take SCSI hard disks A controller designed to provide just RAID 0 functions will not allow you to set up a fault tolerant array The big names in the RAID controller business are Adaptec Highpoint Intel and Promise Highpoint and Promise supply most of the RAID chips that are imbedded in both

    Original URL path: http://www.bestpricecomputers.co.uk/glossary/raid-controller.htm (2016-02-08)
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  • RAID Data Recovery for stand alone hard disks, SAN, NAS and network storage
    on the first one and should one of the hard disks go faulty the other one will seamlessly take over In RAID 0 of course there is double the chance of losing your data You need only one of the hard disks to go faulty and you won t be able to boot into your operating system However there may be occasions when you need a specialist data recovery service Instances are when the power to your hard disk has failed and you are unable to get it to spin Unless you have an exact copy of that hard disk and are willing to roll your sleeves up and swap power units motors on the drives and willing to take the chance of not mucking it up you would probably want to get a specialist in Specialists will also often be able to recover data from file servers storage area networks application servers all manner of RAID from RAID 0 to RAID 10 web servers network attached storage But data recovery doesn t of course only become necessary when there is a hardware fault You could have deleted data erased a file or cleaned out your old emails It s

    Original URL path: http://www.bestpricecomputers.co.uk/glossary/raid-data-recovery.htm (2016-02-08)
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  • Rapid Application Development Defined and Explained
    often didn t really know what they wanted or didn t want until they saw a practical implementation It was through the process of customers commenting on an evolving application that new requirements were teased out Usually this would be seen as an unwelcome development which could play havoc with agreed schedules With the Rapid Application Development methodology however it became a standard and accepted part of the development process With its emphasis on small teams and short development cycles it is not surprising that in Rapid Application Development doctrine code reuse was also prized as a means of helping get the work done This caused early Rapid Application Development adopters to embrace object oriented languages and practices before they had really penetrated into the mainstream Today Rapid Application Development as a formal methodology is no longer widely practiced Some would argue however that it is a case of revolutionaries evolving into statesmen and once boldly innovative thinking becoming the new orthodoxy In its embrace of the object oriented paradigm and the use of software engineering tools to enhance programmer productivity it was certainly ahead of its time And in its emphasis on small teams short iterative development cycles and an avoidance of prolonged requirements gathering up front it shares many similarities with the extreme programming or agile development methodologies which still remain in vogue As well as denoting a formal software development methodology the phrase rapid application development became something of a marketing buzzword and was casually applied to a variety of software development products Although hardly hardcore implementations of the methodology s ideas these products did incorporate some of its key concepts For example to facilitate rapid development strong emphasis was placed on the idea of software re use The notion of software components began to be nurtured Supporters believed that complex software systems could be constructed largely by stitching pre built software components together In this grandiose vision software components would be re used from project to project within a company s development team or even bought in from outside In fact it was hoped that a healthy market for third party software components would develop allowing even small companies to thrive by authoring niche software components designed to be used by others Although reality never quite fulfilled the aspirations of some of the visionaries the ActiveX control and JavaBeans software component standards did acquire some degree of traction and a market for third party code components written to these standards did emerge even if it was never all that vigorous Another key element of the Rapid Application Development lite approach was visual programming According to this concept it should be possible to construct software with little or no knowledge of programming The ideal was that programs could be built by non programmers hooking components together in some kind of workshop like development application Again this ideal was never quite fulfilled but visual development practices did become a standard part of the typical programmer s toolkit and

    Original URL path: http://www.bestpricecomputers.co.uk/glossary/rapid-application-development.htm (2016-02-08)
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  • The Resource Description Framework Explained
    computer system to assimilate the wide variety of data available on the web created for a human audience and respond to queries and searches on that data with any certainty of relevancy The problem lies in the fact that the information held on the Internet is designed for human readers who have a sharp eye for semantics Computers however do not have the ability to make sense of information that would be transparent to human readers When computers see the Internet they simply see the markup language images and so on They have no way of understanding the meaning of the content The Solution As a solution the World Wide Web Consortium W3C developed the Resource Description Framework RDF as a method by which web resources can be encoded with machine readable metadata allowing computers to gather information more efficiently Metadata is not new to the Internet as for example keyword and description tags have been available for a long time which were intended as a means to improve information organisation for computers Although useful initially this system was too open and consequently suffered abuse In many ways RDF is simply a more formalised system of metadata using XML as the basis How RDF Works RDF is built on simple statements which can be organised in triples a method of describing a statement according to its subject predicate and object For example take the following statement This document was written about the Resource Description Framework In this example the subject This document predicate was written about and object the Resource Description Framework could be expressed in RDF and inserted in the head of this web page When a computer reads this RDF triple it would be able to understand the information contained within the page rather than relying on attempting

    Original URL path: http://www.bestpricecomputers.co.uk/glossary/resource-description-framework.htm (2016-02-08)
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  • Risk Management Software Explained
    of the risks and the effects of the risks What does risk management software do Assessing risks and opportunities within a business can have a big effect on the successful implementation of new strategies and completion of projects and individual tasks It s often difficult to prioritise tasks to reduce risks to a minimum and increase opportunities Risk management software is designed to help with this process It provides visual aids to help sort low priority jobs from high priority ones and hence concentrate your efforts on the tasks that will produce the best results most quickly There are two main factors determining the importance of a particular risk Probability the chance that a particular adverse circumstance will come about Assessing the probability of a particular event is a good part of determining the overall risk Cost the price you will have to pay if an adverse event occurs Balancing these two factors is the main way in which risk management software can help you assess your best course of action If you have a risk which is very probable but has only a low cost it may not take as high a priority as a less likely occurrence which has a very high cost Risk Management can be a costly business If you try and take account of all possible risks and allocate resources to remove them or mitigate against them you ll waste those resources if the risky events don t happen The ideal management of risk is one which allocates as few resources as possible while still reducing risks by the maximum amount There are four main ways of reducing risk Risk avoidance don t do something which might be risky This is an obvious way to reduce risk but it also reduces the possibility of gains

    Original URL path: http://www.bestpricecomputers.co.uk/glossary/risk-management-software.htm (2016-02-08)
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  • Software as a Service Explained
    applications such as Facebook YouTube and MySpace could be categorised technically as SaaS applications As an example compare the difference between using webmail and client based email applications such as Microsoft Outlook Lotus Notes or Eudora With a PC based client the users preferences and settings are all tied to their PC and emails are usually copied down to it as well Emails are stored somewhere that most users can t find and moving them from one PC to another requires a significant degree of IT knowledge With a webmail client all you need is a PC and an internet connection to link to your webmail provider and all email past and present all contact details and settings are available straight away There s no link to any one PC so anything that can be done from the user s usual PC can be done from a colleagues PC or from an Internet café SaaS in a Business Environment These well known consumer applications are not often referred to as SaaS applications though The term tends to be used more in the commercial software space where there is a different relationship between the user and the SaaS provider This is usually characterised by payment being made to use the service and the payment model being of the pay as you go PAYG type The major financial difference SaaS offers an enterprise compared to a traditional internally hosted application is the ability to pay for application software on an as needed basis An enterprise quality software application would traditionally be offered in batches of licenses such as 1 10 10 50 etc This means that enterprises have to pay up front for software often before they have the people to really justify it Pay as You Go With the PAYG model and the software and data hosted on servers in the cloud an enterprise can simply pay an application provider an amount per user per month or perhaps the number of minutes used per month depending on the type of application and the precise model that the SaaS provider is operating There are far less IT management overheads as when operating servers to host a company s own copy of an application all that is required are PCs with a browser and an Internet connection An enterprise SaaS also offers all the benefits of consumer web based application in that all the data is centrally hosted so that it can be accessed from anywhere Another secondary benefit is that the PCs in an enterprise do not have to be particularly powerful as all the high powered computation is done on the application provider s servers Startups and SMEs Profit Most This is all of particular benefit to startups and growing SMEs as it all means lower costs immediate access to a fully fledged application and fewer resources wasted on maintaining a computing environment Companies in these situations do however need to be aware that they will be tied into that application

    Original URL path: http://www.bestpricecomputers.co.uk/glossary/software-as-a-service.htm (2016-02-08)
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  • What is Scalable Computing?
    sold as a feature to convince high growth businesses that their future needs can be accommodated easily and without recourse to expensive machine replacement or staff retraining Geographical spread A scalable system need not be at one physical address The easy availability of high speed networks and powerful computers has led to the emergence of two computing trends cluster computing and grid computing Geographically remote desktop computers storage systems data

    Original URL path: http://www.bestpricecomputers.co.uk/reviews/advice/scalable-computing.htm (2016-02-08)
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  • Semantic Networks and the Semantic Web Explained
    used in the formation of strategies Enterprises collect vast amounts of commercial data every day from customer feedback and market research to sales data and supply chain information Unfortunately it isn t possible for an enterprise to devote the resources to study all of this data closely and even if they could it would be out of date by the time they had finished It is vital therefore that enterprises have some method of analysing data quickly efficiently so as to highlight patterns and trends that may be useful in the achievement of their objectives Semantic Networks Semantic networks can be invaluable tools in allowing enterprises to quickly convert these vast volumes of information into valuable data see John F Sowa s article on semantic networks for reference Essentially a computer based semantic network uses metadata data describing data in order to accurately discern the meaning of information Without metadata it is impossible for a computer to understand what information means which severely hampers its ability to manage and serve up valuable data to the user The benefits of semantic networks in business are plain to see By allowing computers a method of recognising the meaning of data held within a data warehouse or other information storage medium our computer searches for specific information become immeasurably more effective Content management systems equipped to support such standards as Extensible Markup Language XML and Resource Description Framework RDF are able to sort through vast amounts of data automatically recognising relationships between information and presenting high quality relevant data to the user on demand An additional benefit of semantic networks in content management is that fact that the sum total of data held within an organisation can be held centrally When all data is assigned standardised semantic metadata there is no need to

    Original URL path: http://www.bestpricecomputers.co.uk/glossary/semantic-networks.htm (2016-02-08)
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