In an environment utilizing type 1 virtualization, the virtualization software is the base operating system (OS) which is installed first onto the subject PC. Additional operating systems, such as Windows or Linux, run as guests on top of the virtualization software.
Type 1 makes the most sense for the enterprise, where administrators need to deploy standardized operating systems to disparate systems. With hardware running type 1 virtualization, administrators can create deployment packages and quickly deliver "complete virtual systems" to systems running the type 1 hypervisor. Backups are also eased and an additional layer of security can be added to end-client devices. Type 1 proves to be most suited for the data center and server class systems, but is starting to find its way to desktop systems.
Examples of type 1 hypervisors include Oracle, VMware's ESX Server, IBM's LPAR, Microsoft's Hyper-V, Sun Microsystems' Logical Domains, TRANGO and Xen.
|Vendor||Product||Hardware||For more information|
|VMware||ESX Server||Intel & AMD|
Type 2 uses a different approach: A primary OS is first installed on the PC (Windows, Linux, MAC, etc.) and then virtualization software is installed on to the primary OS. That virtualization software creates a hypervisor environment that can run guest operating systems. Type 2 proves to be beneficial for those seeking to run guest operating systems occasionally on their local PC or laptop. It is also the basis for Windows XP compatibility mode found on Microsoft's forthcoming Windows 7 operating system. Windows XP compatibility mode works by creating a virtual Windows XP system on top of the Windows 7 OS by using a type 2 hypervisor.
Examples of type 2 virtualization include VMware Workstation, VMware Fusion, QEMU, Microsoft's Virtual PC and SWsoft's Parallels Workstation and Parallels Desktop.
Regardless of the virtualization type chosen, desktop virtualization offers several advantages over traditional single OS deployments:
While virtualization does offer several benefits, there are a few drawbacks that administrators need to know about:
Administrators that are serious about virtual desktops should also look at VDI and connection broker solutions to ease the management hurdles and keep track of who is using what when.
This was first published in August 2009
Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.