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Virtualization : 

Virtualization DS Giri http://SliceData.BlogSpot.com

Virtualization : 

Virtualization creates hardware independence. Simply stated, virtualization is the process of utilizing software to separate the operating system from the physical hardware (computing, storage and networking hardware). Virtualization

What is virtualization? : 

It provide a layer of abstraction between computer hardware systems and the software running on them. By providing a logical view of computing resources, rather than a physical view, virtualization solutions make it possible to do a couple of very useful things: They can allow you, essentially, to trick your operating systems into thinking that a group of servers is a single pool of computing resources. And they can allow you to run multiple operating systems simultaneously on a single machine. Virtualization has its roots in partitioning, which divides a single physical server into multiple logical servers. Once the physical server is divided, each logical server can run an operating system and applications independently. In the 1990s, virtualization was used primarily to re-create end-user environments on a single piece of mainframe hardware. If you were an IT administrator and you wanted to roll out new software, but you wanted see how it would work on a Windows NT or a Linux machine, you used virtualization technologies to create the various user environments. VMware developed the first hypervisor for the x86 architecture in the 1990s, planting the seeds for the current virtualization boom. What is virtualization?

Why Virtualization? : 

Why Virtualization? 60-80% utilization rates for x86 servers (up from 5-15% in nonvirtualized PCs) Cost savings of more than $3,000 annually for every workload virtualized Ability to provision new applications in minutes instead of days or weeks 85% improvement in recovery time from unplanned downtime

Slide 5: 

Less power consumption, both from the servers themselves and the facilities' cooling systems, and fuller use of existing, underutilized computing resources translate into a longer life for the data center and a fatter bottom line. And a smaller server footprint is simpler to manage.

Issues of IT : 

Issues of IT Cost People Security Availability Backup Business continuance Management Process/ITIL

Issues of IT : 

Issues of IT PROCESSES • Business processes • IT processes TOOLS • Applications: Oracle, MS Exchange, MS SQL, BEA, … • OS: Windows, Linux, UX, • Vmware: Lifecycle manager, Stage manager, SRM, … • Other: Storage, Backup, Archiving, etc. PEOPLE • … hard to get • … time and money consuming to train • Hard to focus • … hard to keep

How can virtualization benefit my business? : 

Beyond the potentially dramatic cost savings, virtualization can greatly enhance an organization's business agility. Companies that employ clustering, partitioning, workload management and other virtualization techniques to configure groups of servers into reusable pools of resources are better positioned to respond to the changing demands their business places on those resources. Also, this technology offers the potential for a fundamental change in the way IT managers think about computing resources. When managing individual boxes becomes less of a challenge, the focus of IT can shift from the technology to the services the technology can provide. How can virtualization benefit my business?

What are the different types of virtualization? : 

There are three basic categories of virtualization: Storage virtualization melds physical storage from multiple network storage devices so that they appear to be a single storage device; network virtualization combines computing resources in a network by splitting the available bandwidth into independent channels that can be assigned to a particular server or device in real-time; and server virtualization hides the physical nature of server resources, including the number and identity of individual servers, processors and operating systems, from the software running on them. What are the different types of virtualization?

What are the cost benefits of virtualization? : 

IT departments everywhere are being asked to do more with less, and the name of the game today is resource utilization. Virtualization technologies offer a direct and readily quantifiable means of achieving that mandate by collecting disparate computing resources into shareable pools. For example, analysts estimate that the average enterprise utilizes somewhere between 5 percent and 25 percent of its server capacity. In those companies, most of the power consumed by their hardware is just heating the room in idle cycles. Employing virtualization technology to consolidate underutilized x86 servers in the data center yields both an immediate, one-time cost saving and potentially significant ongoing savings. The most obvious immediate impact here comes from a reduction in the number of servers in the data center. Fewer machines means less daily power consumption, both from the servers themselves and the cooling systems that companies must operate and maintain to keep them from overheating. Turning a swarm of servers into a seamless computing pool can also lessen the scope of future hardware expenditures, while putting the economies of things like utility pricing models and pay-per-use plans on the table. Moreover, a server virtualization strategy can open up valuable rack space, giving a company room to grow. From a human resources standpoint, a sleeker server farm makes it possible to improve the deployment of administrators. What are the cost benefits of virtualization?

What should I look for in a virtualization solution? : 

In a word: management. The core hypervisor technology that decouples the application stack from the underlying hardware is well on its way to commoditization. The large enterprise software vendors (Microsoft, Sun Microsystems, BEA Systems, Hewlett-Packard, BMC and CA, for example) are including it in their product suites, and the standalone virtualization vendors are giving it away. Where they differ is in their ability to provide tools for managing, monitoring and optimizing the allocation of virtualized resources. Look for solutions that provide easy-to-use tools for gathering statistics and applying dynamic policies to better allocate your physical resources among the virtual consumers of those resources. Consequently, the innovation in the virtualization space is happening up the stack. The next-generation products are all about management. VMware has seen the writing on the wall, and has made the shift. Its VMware Infrastructure suite puts everything—servers, storage and the network—into a single resource pool. These enterprise virtualization solutions, such as VMware's ESX Server, blend CPUs, memory, networking, storage and applications into seamless pools of computing resources. What should I look for in a virtualization solution?

What should I look for in a virtualization solution? : 

Virtualization can go a long way toward reducing the physical requirements of the data center, but it can also compound the level of management complexity of those servers. So look for solutions that provide cross-platform systems management for both the virtual and physical machines. Also, you'll want the ability to migrate your organization's legacy applications and existing operating systems, without modification, onto virtual partitions. This migration should make it simpler to enhance the performance of those applications, but you'll need a solution that supports the integration of virtualization with legacy management tools. Virtualization is no longer just about server consolidation. Flexibility is another key benefit of the technology. In virtualized environments, it's easier to move things around, to encapsulate, to archive and to optimize. The leading virtualization vendors are providing "live migration" capabilities that make a network administrator's life easier and more productive. What should I look for in a virtualization solution?

What kinds of challenges does virtualization present : 

This technology changes the way a data center is managed, administered and operated. For example, before server virtualization, you could walk into any data center, ask the admin to name the organization's top five applications, and he would be able to show you the machines those apps were running on. However, the traditional coupling of hardware and software is broken by virtualization. This decoupling creates the potential for performance conflicts. For example, some applications have cyclical performance profiles. A West Coast stock-trading application and a SIMEX app running on the same machine are going to overlap at peak market hours, slowing performance. Consequently, administrators have to think through how the virtualized data center will operate. What kinds of challenges does virtualization present

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