New state-of-the-art and powerful technology was conceptualized in the late 1960s and early 1970s by IBM. It provides the facility to utilize server resources as much as possible or we can say, maximum utilization of server resources. Using this concept, we can create multiple virtual servers on one server.
There are mainly four types of server virtualization:
1. Full-Virtualization:- Full virtualization is the most common type of server virtualization and is also known as hardware virtualization. This virtualization provides the facility to create & run multiple virtual machines (VMs) on a single server. Each and every VM works individually & runs on its own operating system (OS) and required software.
In this virtualization, the system uses a hypervisor to manage and allocate physical resources between virtual machines. Physical resources mean CPU, memory, storage, etc. Hypervisor communicates between the virtual machines.
Using full virtualization, we can get very good isolation between Virtual Machines. This helps each VMs to run independently and securely. We can use this type of virtualization in complex applications and different operating systems.
Advantages of Full-Virtualization
1. Complete OS and Application Isolation - provides strong isolation between VMs.
2. It supports a wide range of operating systems.
3. Hardware Independence
4. Resource Optimization
5. Easy Scalability
Disadvantages of Full-Virtualization
1. Performance Overhead
2. Limited Performance for Certain Workloads
Applications of Full-Virtualization
1. Widely used for server consolidation. Allows to run multiple virtual servers on a single machine.
2. Development and Testing Environments.
3. To run legacy applications on modern infrastructure.
4. Use at the time of Disaster Recovery and Business Continuity.
