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Glossary of IT Infrastructure Library Terms (ITIL®)

Glossary of Terms for the IT Infrastructure Library
Mar 4, 2004

ITSM Watch Staff


V - Z


variance analysis
A variance is the difference between planned, budgeted or standard cost and actual cost (or revenues). Variance analysis is an analysis of the factors that have caused the difference between the predetermined standards and the actual results. Variances can be developed specifically related to the operations carried out in addition to those mentioned above.


An identified instance of a Configuration Item within a product breakdown structure or Configuration Structure for the purpose of tracking and auditing change history. Also used for Software Configuration Items to define a specific identification released in development for drafting, review or modification, test or production.


version identifier
A version number, version date, or version date and time stamp.


virtual memory system
A system that enhances the size of hard memory by adding an auxiliary storage layer residing on the hard disk.


Virtual Storage Interrupt (VSI)
An ICL VME term for a page fault.


A weakness of the system and its assets, which could be exploited by threats.


warm stand-by
See "intermediate recovery".


The lowest level of detail relevant to the customer.


Method of avoiding an incident or problem, either from a temporary fix or from a technique that means the customer is not reliant on a particular aspect of the service that is known to have a problem.


In the context of Capacity Management Modeling, a set of forecasts which detail the estimated resource usage over an agreed planning horizon. Workloads generally represent discrete business applications and can be further subdivided into types of work (interactive, timesharing, batch).


WORM (Device)
Optical read only disks, standing for Write Once Read Many.


XML Extensible Markup Language
XML is a set of rules for designing text formats that let you structure your data. XML makes it easy for a computer to generate data, read data, and ensure that the data structure is unambiguous. XML avoids common pitfalls in language design: it is extensible, platform independent, and it supports internationalization and localization.