Virtualization:
Allow multiple Operating System instances to run concurrently on a single computer. it is a mean of seperating hardware from single Operating System.
Each guest OS is managed by virtual machine monitor (VMM). Also known as Hypervisor, because the virtulization sits between guest and hardware. It can control guest's CPU,memory storage and even allowing a guest OS to migrate from one machine to another. It is the creation of Virtual (rather than actual) version of something such as OS,Server,Storage device or N/W resources.
Why Virtualization:
- Increase manageability,security and flexibility in (H/S) IT environment
- Provide maximum system utilization by consolidating multiple environment in single server/PC
- By abstracting s/w away from underlying h/w- new usage model opens up that reduce cost, increase management, efficiency, strengthen security, while making your computing infrastructure more resilient in event of disaster.
- Reduce power and cooling requirement.
Advantage of Virtualization
- Server Consolidation
- Reduce power and cooling requirement
- Green computing
- Ease of Deployment and administration
- High availability and disaster recovery
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