TOP TEN CONSIDERATIONS FOR CHOOSING A SERVER VIRTUALIZATION TECHNOLOGY

Short Description
The playing field for server virtualization has become much more crowded over the last few years. Competition is always good for a market as more choices always push vendors into providing better products at more competitive prices. It can be very time consuming to digest each vendor’s marketing materials to come to the right solution for your organization. This checklist provides a list of the main considerations and basic differences between the technologies to provide a starting point for technology evaluation. The three main technologies discussed in this analysis are: hardware virtualization, para-virtualization and OS virtualization.

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Content
HARDWARE VIRTUALIZATION
Hardware virtualization is probably the most commonly known technology, including products from VMware and Microsoft’s Virtual Server. The technologies are designed to support multiple types of OSs on a single server and are characterized by technology that virtualizes hardware resources in order to manage and dedicate them to Virtual Machines on the server.
PARA-VIRTUALIZATION
Para-virtualization is similar to hardware emulation because in concept it is designed to support multiple OSs on a single server. The only implementation of this technology today is the Xen open source project, soon to be followed by an actual product from XenSource. Xen is unique in that it customizes the operating system to provide more efficient processing and lower overhead than hardware virtualization.
OS VIRTUALIZATION
OS virtualization is a third approach to virtualization and has been implemented by SWsoft’s Virtuozzo and Sun’s Solaris Containers. The concept is based on a common OS which provides a leaner architecture without extra layers of processing. The main limitation is that it does not support multiple OSs on the same server so it is intended for organizations that are consolidating or deploying multiple virtual servers on a single Linux, Windows or Sun physical server; Solaris Containers obviously supports Solaris while Virtuozzo supports both Linux and Windows. SWsoft Virtuozzo for Linux product does support multiple Linux distributions in the guest virtual servers.
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