Virtualization is an abstraction of physical resources. All virtualization applications are centered around the concept.
There are three main types of virtualization:
1 Server Virtualization
This is where most attention is now concentrated in the world of virtualization is and where most companies begin an implementation of this technology. It is very shocking, given the fact that the proliferation of servers has become a great and legitimateProblem in companies around the world. If a company instead of just running out of room in which all its servers, this type of virtualization, of course, would be very interested in getting a visa.
Since each server is typically a function (for example, mail servers, file servers, Internet servers, servers, enterprise resource planning, etc.), servers with a break down only a fraction of its efficiency, virtualization server "application, a server"Barriers and facilitate the consolidation of multiple servers in a single physical server. This corresponds to (a), less physical servers required, and (b) 70 to 80 percent or greater use of hardware, like the previous 10 to 15 percent against.
Server virtualization allows a server is not the job of multiple servers, sharing the resources of a single server in different environments. The software allows companies to host multiple operating systems and applications locally andin remote locations, freeing users from physical and geographical boundaries.
Since the servers are moved?
Most if not all, offer solutions for virtualization tool migrate a physical server and make an existing virtual hard disk image from the server, the driver stack. Then reboot and run the server as a virtual server. No need to manually rebuild servers and re-configured as a virtual server.
Without doubt, the biggest advantage of the serverVirtualization is the cost. In addition to energy savings and lower capital costs through more efficient use of hardware resources, you get a high availability of resources, better management and improved disaster recovery processes with a virtual infrastructure. You in less physical space, reduce energy consumption and cooling requirements much, and are capable of rapid deployment of a new application without ordering new hardware.
There are three different methods that can be used below,Server virtualization category, but I will not go now because I'm really trying to be so easy about this as I can. Whatever the method used, the goal of server consolidation is the same.
2 customer (or desktop) virtualization
This type of virtualization technology needs with a customer - to do (desktop workstation or laptop, a machine for the end user). This can be very difficult for a system administrator to manage. While each machine inEnterprise Data Center has very strict procedures for what is loaded on them and if they are updated with new software versions, is often a scene very different with regard to the end user of the machine. Even when there are procedures for the above actions are being monitored for the end user on a computer, these procedures are often not noticed or paid much attention. Makes a slot CD or DVD is easy to install unauthorized software that can create problems on this machine. Outsidethat the end users 'computers vulnerable to malware in many ways - via e-mail viruses, spyware unwittingly downloads, etc. Last, but most end users' computers run on Microsoft Windows, including the attraction of attacks is known, hackers and cybercriminals.
IT must not only address these issues, but also to the normal problems associated with client computers: Keep up to date approved software, patching the operating system to keep virus definitions up to date, etal.
All these factors make the task an IT man rather a challenge. Sun client virtualization, security, and network with the hope of a client computer easier to attract the interest of IT.
Since there is no single solution for end-user computing, there are more than one method or model that can be used:
A. remote (server-hosted) desktop virtualization
In this model, the operating environment on a server hosted in the datacenter and accessed by end users through aNetwork
B. Local (Client-hosted) desktop virtualization
In this model, the operating system runs locally on the physical computer, and includes various versions of client-side virtualization techniques, monitoring and protection of the execution of end-users.
C. Application Virtualization
This is a method of providing a particular application to an end user, which is virtualized by the operating system and the desktop is not installed in the traditional way.An application can be installed and / or performed locally within a container, as with any other system and application components that interact with the controls. Or an application can prevent in your virtualized "sandbox" for interaction with other systems and application components to be isolated. Or applications can be transmitted through the network. Applications can be delivered or performed on the network of a web browser with most processing on a central Web server. The latter option is supportedalmost all users without any need for installation on any platform in any position, but only supports a limited number of applications.
3 Storage Virtualization
Storage virtualization is a concept of system administration, to read for the abstraction (separation) of memory logic (virtualized partitions stored) of physical memory (storage devices, stopped spinning, and write as a magnetic or optical CDs, DVDs, or even a hard drive, etc.). ThisSeparation allows systems administrators more flexibility in managing their storage to end users.
The virtualization of storage helps achieve location independence by abstracting the physical location of data. The virtualization system presents the user a logical space for data storage and treated ourselves to the process of mapping the actual physical location.
There are three basic approaches to data storage:
A. Direct-Attached Storage (DAS)
This is thetraditional method of data storage units are used where they are tied to a physical server. Since this method is easy to use, but difficult to manage, virtualization is the technology for the organization of a second thought caused in relation to their profitability.
B. Network-Attached Storage (NAS)
This is a machine on the network and provides data storage capabilities to other machines. It can be thought of as the first step in storage virtualization. This approach provides one-stopdata, facilitate backups. Collecting data in one place, it also avoids the problem of multiple servers to access data on another server.
C. Storage Area Network (SAN)
This highly specialized hardware and software approach involves bare hard drives in a storage solution for data, the data in its high-performance network transmits transform.
Companies are outsourcing a SAN, if they recognize that an important source of corporate datathat must be available 24 / 7 and should be managed comfortably. The price of this approach is very high.
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