| Operating System-level Virtualization |
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There are many terms for the computational partitions, including ''virtual environments'' (VE), '' Virtual Private Server ''s (VPS), ''jails'', ''guests'', ''zones'', ''vservers'' and ''containers''. COMPARISON TO OTHER TECHNIQUES The operating system level architecture has low overhead that helps to maximize efficient use of server resources. Due to a single-kernel approach, this type of virtualization introduces only a negligible overhead and allows running hundreds of Virtual Private Server s on a single physical server. In contrast, approaches such as Emulation (like VMware ) and Paravirtualization (like Xen or UML ) cannot achieve such level of density, due to overhead of running multiple kernels. On the other hand, operating system-level virtualization does not allow running different operating systems (i.e. different kernels), although different libraries, distributions etc. are possible. Since there is a single OS kernel which maintains all the partitions, isolation and resource management become very important. Without proper isolation security can be compromised, and without proper resource management an application from one partition can abuse resources and thus cause a provide a set of more than 20 finite resources that are accounted and limited on a per-partition basis. Compared to the hardware-assisted virtualization solutions (like IBM 's LPAR ), OS-level virtualization has the benefit of running on inexpensive commodity hardware. USES OS level virtualization solutions initially gained popularly with service providers who needed a very low overhead, customizable, cost effective solution to provide hosting services to customers. The technology is now becoming more widely deployed as many different industries and customers are recognizing the benefits and differences between OS virtualization and hardware virtualization. The common uses and scenarios now include server and OS consolidation, business continuity (disaster recovery and high availability) and centralized desktop virtualization. IMPLEMENTATIONS Notes EXTERNAL LINKS
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