Virtual resource partitioning: Difference between revisions

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{{refimprove|date=July 2009}}

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'''Virtual resource partitioning''' ('''VRP''') is an [[operating system-level virtualization]] technology that allocates computing resources (such as [[CPU]] & [[I/O]]) to transactions. Conventional virtualization technologies allocate resources on an [[operating system]] ([[Windows]], [[Linux]]...) wide basis. VRP works 2 levels deeper by allowing regulation and control of the resources used by specific transactions within an application.<ref>{{

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| last = Lipari| first = G.| last2 = Bini| first2 = E.

| title = Resource partitioning among real-time applications

| booktitlebook-title = Real-Time Systems, 2003. Proceedings. 15th Euromicro Conference on

| pages = 151–158

| publisher = IEEE Xplore

| date = 2–4 July 2003

| isbn = 0-7695-1936-9| doi = 10.1109/EMRTS.2003.1212738| hdl = 11382/374720

| url = http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1212738

| hdl-access = free

| isbn = 0-7695-1936-9}}</ref>

}}</ref>

In many computerized environments, a single user, application, or transaction can appropriate all server resources and by that, affect the quality of service & user experience of other active users, applications or transactions. For example, a single report in a [[data warehouse]] environment can monopolize data access by demanding large amounts of data. Similarly, a CPU-bound application may consume all server processing power and starve other activities.

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VRP allows balancing, regulating and manipulating the resource consumption of individual transactions, and by that, improving the overall quality of service, compliance with service level agreements, and the ultimate end user experience.

==VRP technologyTechnology overview==

VRP is usually implemented in the OS in a way that is completely transparent to the application or transaction. The technology creates virtual resource "lanes", each of which has access to a controllable amount of resources, and redirects specific transactions to those lanes allowing them to take more or less resources according to the lane definition.

VRP technology can be implemented in any OperatingOS system.and Existingis vendors in the market applied itavailable on most of the Open operating system such as [[Microsoft Windows|Windows]], [[Red Hat]], [[SUSE Linux|Suse]], [[HP-UX]], [[Solaris (operating system)|Solaris]], [[tru64]], [[AIX]] and others.

VRP is usually implemented at the Operating system in a way that is completely transparent to the application or transaction.

The technology creates virtual resource lanes and redirects specific transactions to those lanes allowing them to take more or less resources according to the lane definition.

In any OS, the application communicates with the OS kernel in a specific way which requires a different VRP implementation. A safe implementation of VRP usually combines several resource allocation techniques. VRP implementations depend on rapidly varying transaction type, consumed resource and kernel state. The VRP implementation must adapt to such changes in real-time.

VRP technology can be implemented in any Operating system. Existing vendors in the market applied it on most of the Open operating system such as [[Microsoft Windows|Windows]], [[Red Hat]], [[Suse]], [[HP-UX]], [[Solaris (operating system)|Solaris]], [[tru64]], [[AIX]] and others.

In any Operating system, the application is communicating with the Kernel in a different way which requires different implementation of VRP. Windows is managing resoruce allocation in a complete different way than Linux Kernel. Therefore applying virtual resoruce lanes implementation is usually kernel dependent.

A safe implementation of VRP technology is usually made up of a mixture of several resource allocation techniques. VRP implementations depend on the transaction type, consumed resource or Kernel state. In a real and live system, Kernel state, transaction types and resource consumption are constantly changing and therefore the VRP technology should change the implemented technique accordingly in real-time.

==References==

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* [http://www.slideshare.net/jimmyschwarzkopf/infrastructure-market-2009 VRP as a new trend in the IT industry]

* [http://www.more-resourcemorevrp.com/MoreVRP_Technologyresources/about-vrp VRP technical overview as implemented by one of the VRP vendors]

[[Category:Virtualization software]]