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Cloud Virtualization Types

Many-to-one virtualization enables the creation of virtual or logical resources from multiple physical resources. This is the core context of cloud computing in which multiple physical resources are grouped together to form one cloud. Virtualization refers to OS virtualization as administrators can implement it by VMware, Xen, or other hypervisor-based technologies. Virtualization is not cloud, rather an enabler for establishing and managing clouds. In the Cisco cloud concept, virtualization is extended to incorporate various types of virtualization, such as network, computer, storage, and services. Generally, there are five varieties of cloud services and four types of deployment approaches, Figure 1.1 illustrates these concepts.

**Figure 1.1** Cloud computing virtualization, service and deployment approaches

Virtualization is useful for several purposes such as sharing a computer system among multiple users, isolating users from each other, and emulating hardware on another machine. Figure 1.2 illustrates the virtualization types.

Server virtualization

Hardware virtualization or server virtualization is the best known application for hardware virtualization. Server virtualization changes the rules by breaking the traditional model of one physical server playing host to a single operating system by creating several virtual machines on top of a single server using hypervisor technology. Computer hardware was designed to run a single operating system and a single application, this leaves most machines vastly underutilized. Virtualization lets the users run multiple virtual machines on a single physical machine, sharing the resources of that single computer across multiple environments. Figure 1.3 illustrates the differences between the physical server and the virtual server.

**Figure 1.3** The Differences between the physical server and the virtual server

In a traditional server model, there is a single OS image for each machine, software and hard ware are tightly coupled, multiple applications often conflict, and there is a single IP address for each server. In virtualization, there is a separation of OS and hardware, OS and application contained in a single virtual machine (VM), applications are isolated from one another, hardware independence, and virtual IP address for each VM. Following are the advantages of server virtualization:

Partitioning
- Single physical machine can run multiple operating systems on it.
- Divide the physical system resources among virtual machines.
- Each VM work independent and does not know the presence of the other.
Management
- Failure of one VM does not affect other VMs.
- Each VM could be management separately and there is individual performance for each VM.
Encapsulation
- The state of any VM can be saved in a file.
- Easy moving and copying VM files information.
Flexibility
- Allows provisioning and migration of any VM to a similar machine on any physical server.
- Usage of multiple OS platforms, for example, Windows, Linux.
- Allows VM configuration changes without actually bringing the VM down.

Storage virtualization

Storage virtualization refers to providing a logical, abstracted view of physical storage devices. It provides a way for many users or applications to access storage without being concerned with where or how that storage is physically located or managed. Storage systems may use virtualization concepts as a tool to enable better functionality and more advanced features within and across storage systems. Storage virtualization enables physical storage to be shared across multiple application servers. Physical devices behind the virtualization layer can be viewed and managed as if they are one large storage pool with no physical boundaries. The storage virtualization makes multiple separate storage devices appear as one device

Virtualization hides the complex process of where the data needs to be stored and bringing it back and presenting it to the user when it is required. Storage Area Network (SAN) arrays use this concept of storage virtualization. SANs enables scalable and flexible storage resource allocation, efficient backup solutions, and higher storage utilization. Storage virtualization provides the following benefits:

Resource optimization.
Cost of operation.
Increased availability.
Improved performance.
Simpler data migration and mobility.
Development of a service catalog.
Ability to monitor capacity utilization and performance.
Signification cost savings.

Network virtualization

Network virtualization is the process of combining hardware and software network resources and network functionality into a single software based administrative entity for virtual network, or mapping two or more disparate networks into a single network. This concept enables the deployment of different architectures and protocols over a shared physical infrastructure and makes it look as if all remote networks are in a single place. The goal of network virtualization is to provide systems and users with efficient, controlled, and secure sharing of the networking resources. Network virtualization involves platform virtualization, often combined with resource virtualization, and it is true that the final product of network virtualization is the virtual network.

Virtual networks are classified into two broad types, external and internal. External virtual networks consist of several local networks that are administered by software as a single unit. The main components of classic external virtual networks are switch hardware and VLAN software technology. Examples of external virtual networks include large corporate networks and data centers. The internal virtual network consists of one system using virtual machines or zones that are configured over at least one pseudo network interface. These containers can communicate with each other as though on the same local network, providing a virtual network on a single host. The building blocks of the virtual network are Virtual Network Interface Cards or Virtual NICs (VNICs) and virtual switches.

Components of a virtual network

Network hardware, such as switches and network interface cards (NICs).
Network elements such as firewalls and load balancers.
Networks, such as virtual LANs (VLANs) and containers such as virtual machines.
Network storage devices.
Network M2M elements such as telecommunications 4G HLR and SLR devices.
Network mobile elements such as laptops, tablets, and cell phones.
Network media, such as Ethernet and Fiber Channel.

It is possible to configure multiple virtual networks within a single network unit, for example a switch using VLANs. Figure 1.4 illustrates a system with three physical NICs without VLANs, the user would configure different systems to perform specific functions and connect these systems to separate networks. For example, Web servers would be connected to one LAN, authentication servers to another, and application servers to a third network. With VLANs and zones, the user can collapse all eight systems and configure them as zones in a single system. Hence, uses VLAN tags, or VLAN IDs to assign a VLAN to each set of zones that performs the same functions.

**Figure 1.4** System with multiple VLANs

Service virtualization

In the cloud world where almost everything is a service, the thinking of cloud computing as the transformation of computing that brings together service orientation with distributed manageability combined with the economies of scale from virtualization is imminent. Service virtualization is a fundamental mechanism for delivering services. Service virtualization in data centers refers to the services such as firewall services for additional security or load-balancing services for additional performance and reliability. Service virtualization is considered as a method to emulate the behavior of specific components in heterogeneous component based applications such as service oriented architectures.

Service Oriented Architecture (SOA) is a software design and software architecture design pattern based on structured collections of discrete software modules, known as services that collectively provide the complete functionality of large software application. SOA allow easy cooperation of a large number of computers that are connected over a network. Every computer can run an arbitrary number of programs which is called services in a context that are built in a way to exchange information with any other service. Within the reach of the network without human interaction and without the need to make changes to the underlying program itself.

The virtual interface, often referred to as a Virtual IP (VIP), is exposed to the outside world, representing itself as the actual Web server, and manages the connections to and from the Web server as needed. This enables the load balancer to manage multiple Web servers or applications as a single instance, providing a more secure and robust topology than one allowing users direct access to individual Web servers. This is a one-to-many virtualization representation. One server is presented to the world, hiding the availability of multiple servers behind a reverse proxy appliance.

OneHoster

12/11/2019

6.55K

Exceptional Performance for Improving Web Site Performance

Browsing Web site is an important example of client server model in the world, if you plan to create a web site you should know that the client browser will get a local copy of the desired page to your machine then render it from the local source, so if the page what the user want to show it is a large size user will go out and will not back again, this problem led us to design a very light page size, page size is the total of the page code and all its content like images, scripts, CSS and any content that the user will see it.

If we target a good exceptional performance for mobile web or even desktop user we must follow some practices for making web pages fast, Yahoo!’s exceptional performance team evangelizes best practices for improving web performance. They conduct research, build tools, write articles and blogs, and speak at conferences. Their best practices center on the rules for high performance web sites, the principal objective is to improve the user experience of the Web when accessed.

The Exceptional Performance team has identified a number of best practices for making web pages fast. The list includes 34 best practices divided into 7 categories:

Content

Make Fewer HTTP Requests
Reduce DNS Lookups
Avoid Redirects
Make Ajax Cacheable
Post-load Components
Preload Components
Reduce the Number of DOM Elements
Split Components across Domains
Minimize the Number of iframes
No 404s

Server

Use a Content Delivery Network
Add an Expires or a Cache-Control Header
Gzip Components
Configure ETags
Flush the Buffer Early
Use GET for AJAX Requests

Cookie

Reduce Cookie Size
Use Cookie-free Domains for Components

CSS

Put Style sheets at the Top
Avoid CSS Expressions
Choose <link> over @import
Avoid Filters

JavaScript

Put Scripts at the Bottom
Make JavaScript and CSS External
Minify JavaScript and CSS
Remove Duplicate Scripts
Minimize DOM Access
Develop Smart Event Handlers

Images

Optimize Images
Optimize CSS Sprites
Don’t Scale Images in HTML
Make favicon.ico Small and Cacheable

Mobile

Keep Components under 25K
Pack Components into a Multipart Document

OneHoster

12/08/2019

4.45K

Challenges of Cloud Computing for Web Based Applications

As previously mentioned the advantages and disadvantages of cloud computing, this section discusses some factors that the users must consider when thinking about moving to cloud. Also Following are some of the barriers to cloud computing technology that the user could face and if these barriers are left unresolved, the cloud computing concept will ultimately destroyed. The barriers fall into several general points as follows:

Technical issues: building a cloud computing is a big technical challenging that needs a significant resources, small companies or organizations cannot bear this burden. To establish a good cloud computing network there is a need to purchase hundreds or thousands of individual computers and servers, then setup them and configure all of them to work together. Users have to invest in software that will manage, control and monitor all of these servers, also feature Web based software have to be developed,

Compatibility issues: all cloud applications is a Web based applications that use the Web technology in its implementation. If employees use a non word document application over the cloud and others use a word document, how to integrate both documents and allow the users to access any of them over the cloud or over the local private network,

Concurrency: both services and applications provide resources that can be shared by clients in cloud computing system. There is therefore a possibility that several clients will attempt to access a shared resource at the same time,

Internet issues: because cloud access is based on a good Internet connection, so the users without high speed Internet connections will have problems in working over cloud,

Security issues: Securing cloud storage is a challenging task, for example, the saved documents in a Web based cloud system. What is the security guarantee that could be offered to the clients? How you guarantee that the document is there when you need it, and

Business model issues: developing cloud Web based applications is a big investment project and companies should make money from offering cloud computing services. Some cloud providers, like Google, offers cloud services free of charge, which is a difficult way to generate revenue. Thus, if the service provider decided to charge for the cloud storage and services, how should these services is priced?

OneHoster

12/07/2019

3.42K

Browsing Web Sites with Mobiles and Desktops

The selection of accessing the Web fro m mobile devices or from desktop computers usually depends on the user needs and location. The use of desktop computers provides larger screen size, broadband connection, the ability to run many applications simultaneously, and the use of tabs for browsing several sites. Desktop computers utilize a pointing device to click over the different fields and buttons to access, hence the chance to get a miss click is very rare. In case of mobile devices , the use of touch taps over the screen by fingers or by using a stylus increases the chances of miss tap due to the fact that the users are touching the area of the screen not the exact pixels. Reversing an action in a desktop browser for example is easy to handle when compared to that of a mobile browser which is more time consuming.

As mobile Internet is growing fast, for example, use of mobile search has grown by 500% over the past two years, while average Smartphone usage almost tripled in 2011. Many researchers are predicting that mobile Internet use will replace the desktop Internet use and is predicted to overtake in 2015. Mobile Internet usage is now a mass market with 69% of users having connection to the Internet through a mobile device in 2012. Smartphones are the most popular mobile access method to the Internet with 61% of respondents using Smartphones versus 37% for notebooks and 22% for tablets. Age is a differentiating factor with 82% of those aged 14-29 accessing the Internet on a mobile device versus only 45% for people above 50

OneHoster

12/05/2019

2.25K

Future of Web and its Applications

Researchers aims to enable users to access all their home devices and to manage them all from mobile devices, or enable users to do all their life activates through mobile devices. Mobile users could check where is the car is parked now or even access and manage it. Client can order car from limousine service provider and most companies now enable their clients to check where the car is and know how far it is. This may sound like science-fiction right in the past, but most of this technology is available now in several parts of the world.

This evolution of handheld devices combined with new high-speed wireless data networks made browsing the mobile Internet a more compelling experience. This phenomenon is like the transition of the Internet when broadband access became widely attainable. The mobile Web is turning a corner and becoming useful to most users. In this article a survey of the literature concerning the Mobile Web and the cloud computing technologies is presented. The main concern is to provide the foundations for merging the two technologies in a mobile cloud computing model .

The mobile Web is simply accessing the World Wide Web (WWW) from mobile devices ranging from cellular phones to iPod touch. Such access does not require a desktop computer or a fixed landline connection. It constitutes the entirety of the Internet and is not limited to websites which have been specifically designed for mobile viewing. Handsets and mobile phones which have Web capabilities can search and browse the Internet from any place with a cellular signal available. Websites which are made especially for the small screen appear as scaled-back versions of their desktop counterparts, often with a numbered menu system for quick access to content. Web destinations which do not have mobile versions appear as if they were squeezed onto the tiny screen, and oftentimes have overlapping menus and links.

A study shows that by the end of 2013, the number of mobile connected devices will exceed the number of people on earth, and by 2017 there will be nearly 1.4 mobile devices per capita. There will be over 10 billion mobile-connected devices in 2017, including machine-to-machine (M2M) modules-exceeding the world’s population at that time (7.6 billion). Global mobile data traffic grew 70 percent in 2012. Global mobile data traffic reached 885 petabytes per month at the end of 2012, up from 520 petabytes per month at the end of 2011.

Mobile Web access today still suffers from interoperability and usability problems. This is partly due to the incompatibility of the format of much of the information available on the Internet with mobile devices, and partly due to the small processing power of the hard ware of mobile devices. The fact that most of the Internet video applications can be categorized as cloud applications, the mobile cloud traffic follows a curve similar to that of video applications. Mobile devices have memory and speed limitations that might prevent them from acting as media consumption devices, which can be substituted for cloud applications and services . For example, cloud applications and services such as Netflix, YouTube , Pandora, and Spotify allow mobile users to overcome the memory capacity and processing power limitations of mobile devices. Globally, cloud applications will account for 84 percent of total mobile data traffic in 2017, compared to 74 percent at the end of 2012.

Another key finding from the data is the type of application generating these data consumption trends. For smart phones and tablets globally, the top three application types are the same for both device types, although they differ in percentage rates. Video streaming and communications applications such as YouTube , Hulu, and Netflix rank highest on both device platforms, although data consumption is slightly higher on tablets. Information applications rank second on tablets (Google Maps, PulseNews, and Wall Street Journal). Social networking (Facebook and Twitter) ranks higher on smart phone, perhaps because the increased mobility of smart phones that allows users to instantly connect socially.

OneHoster

12/04/2019

4.30K

8 Web Design Challenges to Tackle When Designing for the Mobile Web Site

The top 8 design challenges to tackle when designing for the mobile Web . Many of these challenges should also be taken into consideration when designing mobile apps as well.

Lack of a hover state

The ability to hover mouse over an image, icon or text to see reference information or options, is absent. On mobile platforms and devices, features can generally be accessed in two ways, visibly or through convention. Visible content is accessible visually from navigation elements that are built into the design or application . Convention features utilize mobile design conventions or gestures such as swiping, shaking or pull to refresh/reload.

2. Slow and error-prone typing

Typing on a touch keyboard is often a slow and error prone experience no matter what size your fingers are. Helping the users with features like auto complete functionality, inline & address validation and allowing users to review pages before submission can help with this issue.

3. Reduced context

Smaller screens limit the amount of information that can help keep a user on track especially those who need to zoom in to view content in a readable state.

4. Decreased accuracy of clicking links and button

Small size problem and proximity of clickable (or touchable) elements, control buttons, and navigation bars are severe, especially with the lack of a hover state challenge.

5. No right-click

As the right click menu acts as a context based shortcut for common features, most mobile devices lack this option. In some brands, try using a ‘tab-and-hold’ gesture instead.

6. Poor connectivity

Mobile devices are usually associated with the intermittent connectivity issues and the slow download speed. It’s really a two pronged issue:

No connection: While users probably won’t expect offline mode from the website provider, at least there must be a way to handle lost connections gracefully

Slow download speeds: If W eb content should be usable on slower connections, then it is highly desirable to make footprint as small as possible by implementing aggressive asset caching, Using Cascading Style Sheets (CSS3), etc.

7. Slow hardware

While the performance of touch devices is improving rapidly, still are slow when compared with desktop computers. Issues left for web designers of slow hardware include transitions effects and animations.

8. Usage situation

Due to the fact that the unique feature of mobile devices is mobility, there must be a consideration of the impact of real world distractions, a speaker announcement, walking in traffic, etc. Another and possibly important sources of distractions are the digital interruptions text messages, phone calls, push notifications, etc.

The mobile browsers are associated with the same limitations like the mobile Web, such as:

Small screen size: This makes it difficult or impossible to see text and graphics available on the standard size of a desktop computer screen,

Lack of windows: Ability to open several windows simultaneously and switch easily

Navigation: No mouse, thereby limiting the flexibility in navigation

Lack of JavaScript and cookies: Most mobile devices do not support client-side scripting and storage of cookies except some smart phones and iPhones, which is not suitable for uniquely identifying visitors using mobile devices

Speed: Most mobile devices speed of service is very slow, often slower than dial-up Internet access

Types of pages content like (Flash, PDF …)

Compressed pages

Size of messages: Many mobile devices have limitation on the number of characters that can be sent in an email message

Cost: Access and bandwidth charges levied by cell phone networks are much higher than those for fixed-line Internet access.

Currently, vendors of mobile devices attempt to solve most of the previous problems thought developing some strategies like increasing the screen size, enhancing the hard resources (CPU & memory), developing new Operating Systems (OS), improving the Global System for Mobile Communications (GSM) network, or adding network cards to provide the wireless access thought the Wi-Fi technology.

OneHoster

12/03/2019

3.25K

OneHoster Best Web Hosting Company in Egypt and Middle East

OneHoster is an Egyptian company owned by Dr. Mohamed Ali CEO & Founder. Since opening our doors in 2001 under another name, has grown into a full-service web solutions, web hosting, web design, digital marketing and graphic design agency focused on creating integrated strategies, intuitive technology and award-winning design work that produce meaningful results. In October 2010 we upgrade our servers and services also and change our company name to be OneHoster. We have a stable structure for web hosting, web design, web development, digital marketing and graphic design. Our services have been recognized internationally through providing real services for our clients all over the world and independent end users.

OneHoster strives to collaborate with our customers to bring creativity and innovation to all aspects of their organizations. We foster an environment for our employees that encourage thinking outside the box, honest communications, productive team interactions and personal growth. We have the ultimate goal of building a successful organization by remaining a strong and relevant leader in our industry. OneHoster is pleased to introduce its services that will help you conduct and promote your business. We believe in using state-of-the-art technology to deliver reliable and professional services at reasonable prices to our customers. We grow and develop with our customers’ needs in mind. OneHoster gives your business the competitive edge you are looking for.

International market

USA.
Europe: UK, France, Italy, and Norway.
Gulf: Saudi Arabia, Qatar, Libya and Bahrain.
East Asia: China and Russia.

Local market

Cairo.
10th of Ramadan..
Bader Industrial Zone.
Alexandria.
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Borg El Arab – Industrial Zone.
Rasheed.
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New Domietta – Industrial Zone.
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Sharki, New Salheya City – Industrial Zone
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OneHoster

11/15/2019

68

Branding and SEO

From site work to custom brick and stone masonry, Gardeny can install your project with its own talented artisans and quality landscaping equipment. Using our extensive knowledge of soils, plants, landscape materials, and construction techniques, we are well qualified for any size project. We employ all our resources to achieve the best possible results, no matter the scale.

Our distinctive water features will introduce sound and motion into your landscape experience.The element of water will release your stress and introduce you to the essence of nature herself. No two water gardens are alike, yet most are similar. Constructed of quality components and natural materials, our water features compliment any setting.

Gardeny plants and trees are grown at our own NC Certified Nursery in Durham. Our NC Certified Plant Professional and staff horticulturist have collaborated to create one of the best nursery resources in the Triangle. We offer Landscape Investment Plants and Trees that will return dividends in growth, beauty, and value throughout the life of your landscape.

Gardeny plants and trees are grown at our own NC Certified Nursery in Durham. Our NC Certified Plant Professional and staff horticulturist have collaborated to create one of the best nursery resources in the Triangle. We offer Landscape Investment Plants and Trees that will return dividends in growth, beauty, and value throughout the life of your landscape.

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OneHoster

07/12/2019

6.71K

SEO&Marketing

From site work to custom brick and stone masonry, Gardeny can install your project with its own talented artisans and quality landscaping equipment. Using our extensive knowledge of soils, plants, landscape materials, and construction techniques, we are well qualified for any size project. We employ all our resources to achieve the best possible results, no matter the scale.

Our distinctive water features will introduce sound and motion into your landscape experience.The element of water will release your stress and introduce you to the essence of nature herself. No two water gardens are alike, yet most are similar. Constructed of quality components and natural materials, our water features compliment any setting.

Gardeny plants and trees are grown at our own NC Certified Nursery in Durham. Our NC Certified Plant Professional and staff horticulturist have collaborated to create one of the best nursery resources in the Triangle. We offer Landscape Investment Plants and Trees that will return dividends in growth, beauty, and value throughout the life of your landscape.

Gardeny plants and trees are grown at our own NC Certified Nursery in Durham. Our NC Certified Plant Professional and staff horticulturist have collaborated to create one of the best nursery resources in the Triangle. We offer Landscape Investment Plants and Trees that will return dividends in growth, beauty, and value throughout the life of your landscape.

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OneHoster

07/11/2019

4.29K

Web Hosting and Web Design Services

OneHoster was established with stable structure for web hosting, web design, web development and graphic design. Our services have been recognized internationally through providing real services for our clients all over the world and independent end users.

OneHoster

12/01/2001