A Virtual Machine
Most computers only have one operating system installed.Virtualization software allows a computer to run several operating systems at the same time. Virtualization refers to running multiple operating systems on a single machine. For example, a Windows computer with VMware Workstation installed can run Linux within the Windows interface. When another operating system (OS) is running on top of the main system, it is called a "virtual machine." A data center might become overcrowded with racks of servers consuming a lot of power and generating heat.The most important part of deployment is planning security policies. It is not possible to plan for security, however, until a full risk assessment has been performed. Security planning involves developing security policies, Disaster Recovery Programs and implementing controls to prevent computer risks from becoming reality.
Virtualization – An independent Machine
Virtualization, in computing, is the creation of a virtual version such as a hardware platform, operating system, a storage device or network resources
Why Use Server Virtualization
There are many reasons companies and organizations are investing in server virtualization. Some of the reasons are financially motivated, while others address technical concerns:
• Server virtualization conserves space through consolidation. For companies that have hundreds or thousands of servers, the need for physical space can decrease significantly.
• Server virtualization provides a way for companies to practice redundancy (running the same application on multiple servers) without purchasing additional hardware.
• Virtual servers offer programmers isolated, independent systems in which they can test new applications or operating systems.
Three Kinds of Server Virtualization
There are three ways to create virtual servers: full virtualization, Para-virtualization and OS-level virtualization.
Full virtualization uses a hypervisor that interact directly with the physical server's CPU and disk space. The guest servers in a Para-virtualization system are aware of one another. The entire system works together as a cohesive unit. An OS-level virtualization approach is part of the host OS, which performs all the functions of a fully virtualized hypervisor.
Limitations of Server Virtualization
For servers dedicated to applications with high demands on processing power, virtualization isn't a good choice. That's because virtualization essentially divides the server's processing power up among the virtual servers.
It's also unwise to overload a server's CPU by creating too many virtual servers on one physical machine. Too many virtual servers could impact the server's ability to store data.
Another limitation is migration. Right now, it's only possible to migrate a virtual server from one physical machine to another if both physical machines use the same manufacturer's processor
Many companies are investing in server virtualization despite its limitations. As server virtualization technology advances, the need for huge data centers could decline
Most computers only have one operating system installed.Virtualization software allows a computer to run several operating systems at the same time. Virtualization refers to running multiple operating systems on a single machine. For example, a Windows computer with VMware Workstation installed can run Linux within the Windows interface. When another operating system (OS) is running on top of the main system, it is called a "virtual machine." A data center might become overcrowded with racks of servers consuming a lot of power and generating heat.The most important part of deployment is planning security policies. It is not possible to plan for security, however, until a full risk assessment has been performed. Security planning involves developing security policies, Disaster Recovery Programs and implementing controls to prevent computer risks from becoming reality.
Virtualization – An independent Machine
Virtualization, in computing, is the creation of a virtual version such as a hardware platform, operating system, a storage device or network resources
Why Use Server Virtualization
There are many reasons companies and organizations are investing in server virtualization. Some of the reasons are financially motivated, while others address technical concerns:
• Server virtualization conserves space through consolidation. For companies that have hundreds or thousands of servers, the need for physical space can decrease significantly.
• Server virtualization provides a way for companies to practice redundancy (running the same application on multiple servers) without purchasing additional hardware.
• Virtual servers offer programmers isolated, independent systems in which they can test new applications or operating systems.
Three Kinds of Server Virtualization
There are three ways to create virtual servers: full virtualization, Para-virtualization and OS-level virtualization.
Full virtualization uses a hypervisor that interact directly with the physical server's CPU and disk space. The guest servers in a Para-virtualization system are aware of one another. The entire system works together as a cohesive unit. An OS-level virtualization approach is part of the host OS, which performs all the functions of a fully virtualized hypervisor.
Limitations of Server Virtualization
For servers dedicated to applications with high demands on processing power, virtualization isn't a good choice. That's because virtualization essentially divides the server's processing power up among the virtual servers.
It's also unwise to overload a server's CPU by creating too many virtual servers on one physical machine. Too many virtual servers could impact the server's ability to store data.
Another limitation is migration. Right now, it's only possible to migrate a virtual server from one physical machine to another if both physical machines use the same manufacturer's processor
Many companies are investing in server virtualization despite its limitations. As server virtualization technology advances, the need for huge data centers could decline
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