In hardware virtualization, the resources of a physical system can be distributed among several virtual systems. Each guest system, including all the programs 711kelab Malaysia running on it, is separate from the underlying hardware.
In practice, virtual machines are mainly used to isolate certain processes and applications for security reasons.
In the business context, virtual machines are used to reduce the costs of operating and maintaining IT infrastructures. Businesses sometimes have extensive IT infrastructure that is idle for most of the day, so virtual machines can significantly reduce such downtime.
Hypervisors allow parallel operation of different operating systems or versions of the system, where VMs can be created, cloned, and removed from the physical hard drive with the push of a button and without leaving any data saved. Also, faulty processes within a virtual machine have no effect on the underlying system due to encapsulation.
An encapsulated Linux application of this type no longer has all the performance of the underlying hardware at its disposal. This is called overhead or overhead.
If multiple virtual machines are running on the same host system, the resource requirements of one machine during performance spikes can also affect the performance of the other machines on the same host. This can be countered by guaranteeing each virtual machine, a fixed group of hardware resources. If you decide to create a virtual machine, you must ensure that the total of virtual resources used simultaneously never exceeds the maximum power available on the physical computer.
Advantages and disadvantages of virtual machines at a glance
The following table compares the main advantages and disadvantages of virtual machines. The extent to which these benefits and limitations matter depend primarily on the framework within which you want to deploy your VM and the purpose of virtualization.
Advantage & Disadvantages
Parallel Operation of Multiple Guest Systems – hypervisor-based virtualization enables parallel operation of multiple operating systems on the same hardware basis. Many hypervisors offer emulation functions that can overcome incompatibilities between different system architectures.
Improved resource utilization through hardware consolidation: By running multiple virtual machines on one physical machine, hardware resources can be better utilized. Such consolidation increases the performance of the provided hardware, reduces downtime, and saves costs. For shared hardware, power spikes can cause a funnel effect: Because all virtual machines on a host system share the same hardware resources, performance spikes can cause a funnel effect.
Strong encapsulation of the host system and all processes running on it – each guest system runs in isolation in a virtual runtime environment. If a virtual machine crashes due to a faulty processor is infiltrated by hackers or malware, this usually has no effect on virtual machines running in parallel or on the underlying host system. The hypervisor as a single point of failure: If hackers or malware attacks are targeted directly against virtualization software, all guest systems managed by the hypervisor may be affected.