- Hypervisor is piece of software or firmware that creates and run virtual machines.
- It also called Virtual Machine Manager (VMM)
- There are two types of Hypervisor:
- Type-1 Hypervisor (Bare Metal)
- Type -2 Hypervisor (Hosted)
- Also Known as Bare Metal.
- It directly run on system Hardware.
- A guest OS run on another level above the hypervisor.
- Type -1 acts as thier own OS.
- It is More Secure.
- Vmware ESXi is Type-1 Hypervisor that run directly on Sever(Machine) Hardware without depend on OS.
- ESXi provide a virtualization layer that abstract the CPU, Storage, memory and networking resources of the physical host(Hardware/Sever) into multiple virtual machines.
- Hypervisor that run on OS as an Application.
- It does not have direct acces to host hardware and recources.
- It is used as Testing and Learning Purpose.
- It is less secure
- Example: Vmware Workstation, Oracle Vmware, Microsoft Virtual PC..
| Criteria | Type-1 | Type-2 |
|---|---|---|
| aka | Bare Metal | Hosted |
| Virtualization | Hardware Virtualization | Software Virtualization |
| Operation | Guest OS & Apps run on hypervisor | Run as an application on Host OS |
| Scalability | Better | Not Better |
| System Independant | It has direct access to hardware | It does not direct access to hardware and resources |
| Performance | High | Low |
| Security | More Secure | Less Secure |
| Example | Vmware ESXi, Microsoft Hyper-V | Vmware workstation, Microsoft VirtualPC |
This is about Hypervisor. In next day we will see Vmware Vsphere in detail. HERE