Trademarks: Wiley, the Wiley logo, For Dummies, the Dummies Man logo, A Reference for the Rest of Us!, The Dummies Way, gestheatagkiantes.ml, Making Everything. Robin Bloor,. Marcia Kaufman, and Dr. Fern Halper. Cloud. Computing. FOR. DUMmIES‰ Trademarks: Wiley, the Wiley Publishing logo, For Dummies, the Dummies Man logo, A Reference for the jericho/cloud_cube_model_vpdf. For information about licensing the For Dummies brand for products or services, contact . can leverage the flexibility of cloud computing to effectively compete.
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Cloud computing is a strong distributed environment and it heavily depends upon strong algorithm. Virtualization is a partitioning of single physical server into multiple logical servers. Once the physical server is divided, each logical server behaves like a physical server and can run an operating system and applications independently.
They are fast, cost-effective and less time consuming. For software developers and testers virtualization comes very handy, as it allows developer to write code that runs in many different environments and more importantly to test that code. Storage Virtualization: It is the pooling of physical storage from multiple network storage devices into what appears to be a single storage device that is managed from a central console.
Storage virtualization is commonly used in storage area networks SANs. Server Virtualization: Server virtualization is the masking of server resources like processors, RAM, operating system etc, from server users.
The intention of server virtualization is to increase the resource sharing and reduce the burden and complexity of computation from users.
Virtualization is the key to unlock the Cloud system, what makes virtualization so important for the cloud is that it decouples the software from the hardware. Usually hard disk has a lot more space than memory. Although virtual disks are slower than real memory, if managed properly the substitution works perfectly.
Likewise, there is software which can imitate an entire computer, which means 1 computer can perform the functions equals to 20 computers. Grid Computing Vs Cloud Computing When we switch on the fan or any electric device, we are less concern about the power supply from where it comes and how it is generated.
The power supply or electricity that we receives at our home travels through a chain of network, which includes power stations, transformers, power lines and transmission stations. Grid Computing is a middle ware to co-ordinate disparate IT resources across a network, allowing them to function as whole. It is more often used in scientific research and in universities for educational purpose.
For example, a group of architect students working on a different project requires a specific designing tool and a software for designing purpose but only couple of them got access to this designing tool, the problem is how they can make this tool available to rest of the students. To make available for other students they will put this designing tool on campus network, now the grid will connect all these computers in campus network and allow student to use designing tool required for their project from anywhere.
Cloud computing and Grid computing is often confused, though there functions are almost similar there approach for their functionality is different. Let see how they operate- Cloud Computing Cloud computing works more as a service provider for utilizing computer resource Grid computing uses the available resource and interconnected computer systems to accomplish a common goal Cloud computing is a centralized model Grid computing is a decentralized model, where the computation could occur over many administrative model Cloud is a collection of computers usually owned by a single party.
A grid is a collection of computers which is owned by a multiple parties in multiple locations and connected together so that users can share the combined power of resources Cloud offers more services all most all the services like web hosting, DB Data Base support and much more Grid provides limited services Cloud computing is typically provided within a single organization eg : Amazon Grid computing federates the resources located within different organization. Utility computing is a good source for small scale usage, it can be done in any server environment and requires Cloud Computing.
Utility computing is the process of providing service through an on-demand, pay per use billing method. Based on the concept of utility computing , grid computing, cloud computing and managed IT services are based. Through utility computing small businesses with limited budget can easily use software like CRM Customer Relationship Management without investing heavily on infrastructure to maintain their clientele base.
Utility Computing Cloud Computing Utility computing refers to the ability to charge the offered services, and charge customers for exact usage Cloud Computing also works like utility computing, you pay only for what you use but Cloud Computing might be cheaper, as such, Cloud based app can be up and running in days or weeks. If your business is selling books or repairing shoes, why get involved in the nitty gritty of buying and maintaining a complex computer system?
If you run an insurance office, do you really want your sales agents wasting time running anti-virus software, upgrading word-processors, or worrying about hard-drive crashes? Do you really want them cluttering your expensive computers with their personal emails, illegally shared MP3 files, and naughty YouTube videos—when you could leave that responsibility to someone else?
Cloud computing allows you to buy in only the services you want, when you want them, cutting the upfront capital costs of computers and peripherals. You avoid equipment going out of date and other familiar IT problems like ensuring system security and reliability. You can add extra services or take them away at a moment's notice as your business needs change.
It's really quick and easy to add new applications or services to your business without waiting weeks or months for the new computer and its software to arrive. Drawbacks Photos: Cloud computing: forward to the future In the s, the Apple ][ became the world's first, bestselling small business computer thanks to a killer-application called VisiCalc, the first widely available computer spreadsheet.
It revolutionized business computing, giving middle managers the power to crunch business data on their desktops, all by themselves, without relying on slow, centralized computer departments or bought-in data processing. Critics are concerned that cloud computing could be disempowering—a throwback to the s world of centralized, proprietary computing.
Instant convenience comes at a price. Instead of purchasing computers and software, cloud computing means you buy services, so one-off, upfront capital costs become ongoing operating costs instead.
That might work out much more expensive in the long-term. If you're using software as a service for example, writing a report using an online word processor or sending emails through webmail , you need a reliable, high-speed, broadband Internet connection functioning the whole time you're working.
That's something we take for granted in countries such as the United States, but it's much more of an issue in developing countries or rural areas where broadband is unavailable. If you're buying in services, you can buy only what people are providing, so you may be restricted to off-the-peg solutions rather than ones that precisely meet your needs.
Not only that, but you're completely at the mercy of your suppliers if they suddenly decide to stop supporting a product you've come to depend on. Google, for example, upset many users when it announced in September that its cloud-based Google Docs would drop support for old but de facto standard Microsoft Office file formats such as.
XLS, and. PPT, giving a mere one week's notice of the change—although, after public pressure, it later extended the deadline by three months. Critics charge that cloud-computing is a return to the bad-old days of mainframes and proprietary systems, where businesses are locked into unsuitable, long-term arrangements with big, inflexible companies.
Instead of using "generative" systems ones that can be added to and extended in exciting ways the developers never envisaged , you're effectively using "dumb terminals" whose uses are severely limited by the supplier. Good for convenience and security, perhaps, but what will you lose in flexibility? And is such a restrained approach good for the future of the Internet as a whole?
Think of cloud computing as renting a fully serviced flat instead of buying a home of your own. Clearly there are advantages in terms of convenience, but there are huge restrictions on how you can live and what you can alter. Will it automatically work out better and cheaper for you in the long term? In summary Lower upfront costs and reduced infrastructure costs.
Easy to grow your applications. Scale up or down at short notice. Only pay for what you use. Everything managed under SLAs. Overall environmental benefit lower carbon emissions of many users efficiently sharing large systems. But see the box below. Cons Higher ongoing operating costs.
Could cloud systems work out more expensive? Greater dependency on service providers.
Can you get problems resolved quickly, even with SLAs? Risk of being locked into proprietary or vendor-recommended systems? How easily can you migrate to another system or service provider if you need to? What happens if your supplier suddenly decides to stop supporting a product or system you've come to depend on? Potential privacy and security risks of putting valuable data on someone else's system in an unknown location?
If lots of people migrate to the cloud, where they're no longer free to develop neat and whizzy new things, what does that imply for the future development of the Internet? Dependency on a reliable Internet connection. Cloud computing trends We've just had a quick and simple sketch of cloud computing—and if that's all you need, you can stop reading now.
This section fills in some of the details, asks some deeper questions, looks at current trends, such as the shift to mobile devices, and explores challenging issues like privacy and security. Growth The figures speak for themselves: in every IT survey, news report, and pundit's op-ed, cloud computing seems the only show in town.
Back in , over a decade ago, the Pew Internet project reported that 69 percent of all Internet users had "either stored data online or used a web-based software application" in other words, by their definition, used some form of cloud computing.
The Microsoft Cloud isn't far behind. A matter of definitions So the numbers keep on creeping up and it's an exciting trend, to be sure. But there's one important word of caution: how you measure and forecast something as vague as "the cloud" depends on how you define it: if the definition keeps expanding, perhaps that's one reason why the market keeps expanding too?
Way back in the s, no-one described Yahoo! Mail or Hotmail as examples of cloud computing, Geocities was simply a community of amateur websites, and Amazon and eBay were just new ways of finding and buying old stuff. In , in its breathless eagerness to talk up cloud computing, the Pew Internet project had rounded up every web-based service and application it could think of and fired it to the sky.
Wordpress and Twitter were examples of cloud blogging, Google Docs and Gmail were cloud-based, and suddenly so too were Yahoo! Mail, buying things from eBay and Amazon, and even bizarrely RSS feeds which date back to the late s. Using "the cloud" as a loose synonym for "the Web," then expressing astonishment that it's growing so fast seems tautologous at best, since we know the Internet and Web have grown simply by virtue of having more connected users and more especially more mobile devices.
According to Pew, what these users prized were things like easy access to services from absolutely anywhere and simple data storing or sharing. This is a circular argument as well: one reason we like "the cloud" is because we've defined it as a bunch of likeable websites—Facebook, Twitter, Gmail, and all the rest. Business benefits Businesses have shrewder and more interesting reasons for liking the cloud. Instead of depending on Microsoft Office, to give one very concrete example, they can use free, cloud-based open-source alternatives such as Google Docs.
So there are obvious cost and practical advantages: you don't have to worry about expensive software licenses or security updates, and your staff can simply and securely share documents across business locations and work on them just as easily from home. Using cloud computing to run applications has a similarly compelling business case: you can buy in as much or little computing resource as you need at any given moment, so there's no problem of having to fund expensive infrastructure upfront.
If you run something like an ecommerce website on cloud hosting, you can scale it up or down for the holiday season or the sales, just as you need to. Best of all, you don't need a geeky IT department because—beyond commodity computers running open-source web browsers—you don't need IT. Spot the difference When we say cloud computing is growing, do we simply mean that more people and more businesses are using the Web and using it to do more than they used to?
Actually we do—and that's why it's important not to be too loose with our definitions. Cloud web hosting is much more sophisticated than ordinary web-hosting, for example, even though—from the viewpoint of the webmaster and the person accessing a website—both work in almost exactly the same way.
This web page is coming to you courtesy of cloud hosting where, a decade ago, it ran on a simple, standalone server. It's running on the same open-source Apache server software that it used then and you can access it in exactly the same way with http and html. The difference is that it can cope with a suddenly spike in traffic in the way it couldn't back then: if everyone in the United States accessed this web page at the same time, the grid of servers hosting it would simply scale and manage the demand intelligently.
The photos and graphics on the page and some of the other technical stuff that happens behind the scenes are served from a cloud-based Content Delivery Network CDN : each file comes from a server in Washington, DC, Singapore, London, or Mumbai, or a bunch of other "edge locations," depending on where in the world you the browser happen to be.
This example illustrates three key points of difference between cloud-based services and applications and similar ones accessed over the web. One is the concept of elasticity which is a similar idea to scalability : a cloud service or application isn't limited to what a particular server can cope with; it can automatically expand or contract its capacity as needed.
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The easy way to understand and implement cloud computing technology written by a team of experts Cloud computing can be difficult to understand at first, but the cost-saving possibilities are great and many companies are getting on board.
Cloud computing is a way for businesses to take advantage of storage and virtual services through the Internet, saving money on infrastructure and support This book provides a clear definition of cloud computing from the utility computing standpoint and also addresses security concerns Offers practical guidance on delivering and managing cloud computing services effectively and efficiently Presents a proactive and pragmatic approach to implementing cloud computing in any organization Helps IT managers and staff understand the benefits and challenges of cloud computing, how to select a service, and what's involved in getting it up and running Highly experienced author team consults and gives presentations on emerging technologies Cloud Computing For Dummies gets straight to the point, providing the practical information you need to know.
Permissions Request permission to reuse content from this site. Table of contents Introduction. Part I: Introducing Cloud Computing.
Chapter 1: Grasping the Fundamentals. Chapter 2: Discovering the Value of the Cloud for Business. Chapter 3: Getting Inside the Cloud. Chapter 4: Developing Your Cloud Strategy.