IT Governance, Risk, and Compliance » Demand Segmentation http://itknowledgeexchange.techtarget.com/it-governance Mon, 20 May 2013 00:56:50 +0000 en-US hourly 1 Managing the Growth and Impact of Virtual Machines and Memory – Part VIII http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-viii/ http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-viii/#comments Tue, 08 Mar 2011 20:41:44 +0000 Robert Davis http://itknowledgeexchange.techtarget.com/it-governance/?p=877 Given the proliferation of available hardware and software products that enable capitalizing on benefits associated with IT virtualization, when IT employees fail to perform effective configuration management; potential threats to the IT architecture are significantly increased. Besides managing the common risks associated with utilizing virtual memory and system virtual machines, additional procedures are necessary due to the inherent control weakness in program conversion to binary code for deployed process virtual machines. In particular, since process virtual machines are typically implemented using a program interpreter that relies on just-in-time source code compilation, programs are more susceptible to task modification. Thus, IT virtualization technology must be controlled to prevent service disruptions to end users and financial losses to the entity.

“View Part I of the Managing the Growth and Impact of Virtual Machines and Memory series here“

]]> http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-viii/feed/ 0 Managing the Growth and Impact of Virtual Machines and Memory – Part VII http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-vii/ http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-vii/#comments Fri, 04 Mar 2011 18:42:39 +0000 Robert Davis http://itknowledgeexchange.techtarget.com/it-governance/?p=873 As with any IT architecture item, to address the entity’s processing needs, virtual machines require execution of effective configuration management. Application of effective configuration management principles and practices “enables management to reduce the risk of requiring back-out due to inadequate preparation and/or incompatible changes affecting system availability and data processing integrity.” Therefore, an entity’s IT management should ensure the IT department has:

  • undertaken configuration management planning
  • identified configuration items
  • established a configuration management database
  • established a definitive software library
  • recorded configuration controls
  • maintained the status of configuration items
  • tracked the status of configuration items
  • reviewed configuration items against configuration management database records
  • managed configuration item libraries, licenses, and stores

“View Part I of the Managing the Growth and Impact of Virtual Machines and Memory series here“

]]> http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-vii/feed/ 0 Managing the Growth and Impact of Virtual Machines and Memory – Part VI http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-vi/ http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-vi/#comments Tue, 01 Mar 2011 16:21:52 +0000 Robert Davis http://itknowledgeexchange.techtarget.com/it-governance/?p=871 Though a process virtual machine can be considered an application-orientated system virtual machine; process virtual machine uniqueness resides in the provisioning of “a platform-independent programming environment that abstracts away details of the underlying hardware or operating system, and allows a program to execute in the same way on any platform.” Moreover, a process virtual machine executes as a normal application inside operating systems and only supports a single process. It is created when a process is started and dismantled when the process has concluded. At this configuration level, appropriate utilization of command services is a practical method for controlling a process virtual machine.

“View Part I of the Managing the Growth and Impact of Virtual Machines and Memory series here“

]]> http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-vi/feed/ 0 Managing the Growth and Impact of Virtual Machines and Memory – Part V http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-v/ http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-v/#comments Fri, 25 Feb 2011 17:47:56 +0000 Robert Davis http://itknowledgeexchange.techtarget.com/it-governance/?p=868 Derived from virtual memory concepts, virtual machines are a distinct IT configuration class. Under the virtual machine class, a ‘system virtual machine’ represents one physical unit subdivided so each of the component partitions function independently. The attractiveness of this technique is that it enables the deployment of more than one similar or dissimilar operating system within an IT hardware configuration. In addition, a ‘system virtual machine’ allows for the tandem operation of two or more programs within the definitions of multiprocessing. Control over the ‘system virtual machine’ is achieved through a virtual machine monitor (also known as a hypervisor) that typically provides consolidation, stability, security, flexibility, migration, and cloning capabilities.

“View Part I of the Managing the Growth and Impact of Virtual Machines and Memory series here“

]]> http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-v/feed/ 0 Managing the Growth and Impact of Virtual Machines and Memory – Part IV http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-iv/ http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-iv/#comments Tue, 22 Feb 2011 23:34:41 +0000 Robert Davis http://itknowledgeexchange.techtarget.com/it-governance/?p=864 Demand paging is a technique wherein computer memory is divided into fixed-length blocks. These fixed-length blocks, commonly referred to as pages, can be effectively exchanged or swapped back and forth between primary and secondary storage devices as required. When a page is needed, the location must be immediately determinable. If a page is located in primary memory, it is bound for use in performing the originating object’s objective. That is, memory is relocated and/or attached to permit the completion of the originating program’s functions, even if the page is in a secondary storage device. Generally, control software employs tables to accomplish the task of making pages accessible for processing.

“View Part I of the Managing the Growth and Impact of Virtual Machines and Memory series here“

]]> http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-iv/feed/ 0 Managing the Growth and Impact of Virtual Machines and Memory – Part III http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-iii/ http://itknowledgeexchange.techtarget.com/it-governance/managing-the-growth-and-impact-of-virtual-machines-and-memory-part-iii/#comments Fri, 18 Feb 2011 21:11:06 +0000 Robert Davis http://itknowledgeexchange.techtarget.com/it-governance/?p=862 Virtual memory is typically implemented based on at least one of two principle techniques: demand segmentation and demand paging.

Demand segmentation is a technique in which locating computer objects is determined by criteria applied only at the moment of need. Employing primary and secondary storage devices, this technique allocates memory segments as they are required. Concurrently, control software manages the availability of memory segments and connects each incoming module to its originating program according to its function within the IT configuration. A control routine then links the internal and external modules, managing while processing both permanent and transient objects as necessary.

“View Part I of the Managing the Growth and Impact of Virtual Machines and Memory series here“

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