You'll also want to determine how long you'll need VPS web hosting. If you need hosting for a short time period—say, less than a month or two—you'll typically receive a refund should you cancel your hosting within 60 days. These money-back guarantees vary from web host to web host. For example, Company X may offer a 30-day money-back guarantee, while Company Y may offer a lengthy 90-day money-back guarantee. As always, it's best to shop around for the features that best suit your web hosting needs.
Which VPS hosting plan to choose between a managed VPS and unmanaged VPS? Generally speaking, unmanaged VPS hosting is less expensive than managed VPS hosting when you compare plans that have the same allocated resources. One of the main reason is that your hosting provider offers less support on unmanaged VPS, thus they charge less for the service. If you are well-versed in VPS hosting and you have a lot of time planed for the VPS server, you can go for a unmanaged VPS. Otherwise, you should get a managed VPS. Some of the tech issues you may need to know if you choose unmanaged VPS include but not limited to: VPS security, software update and patching, LAMP server configuration (linux, apache, mysq, php), DNS configuration, control panel setup, SSL certificates creation, website setup, server backup, etc.
Partitioning a single server to appear as multiple servers has been increasingly common on microcomputers since the launch of VMware ESX Server in 2001. The physical server typically runs a hypervisor which is tasked with creating, releasing, and managing the resources of "guest" operating systems, or virtual machines. These guest operating systems are allocated a share of resources of the physical server, typically in a manner in which the guest is not aware of any other physical resources save for those allocated to it by the hypervisor. As a VPS runs its own copy of its operating system, customers have superuser-level access to that operating system instance, and can install almost any software that runs on the OS; however, due to the number of virtualization clients typically running on a single machine, a VPS generally has limited processor time, RAM, and disk space.