MB Virt 12843 v4 4-23


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MB Virt 12843 v4 4-23

  1. 1. Next Generation Network Series Virtualization Introduction When you combine the rapid provisioning and pay-for-use attributes A new view of the telecommunications network is taking shape, of a utility, with the flexible partition sizes and dynamic migration of as networks are understood to be more than transport mechanisms. virtualization, you get nearly continuous capacity with the ability to Given the convergence of voice and data, and the increasing increment or decrement on demand. You can also arrange to pay for intelligence of the network itself, the next generation network exactly what you use. That’s a great combination for any IT organization. is becoming a distributed computing architecture that is enabling Consider a cab ride. It is a virtual concept that eventually gets new kinds of collaboration, new kinds of applications, and new mapped into a specific vehicle and cab driver. It is also a pay-per-use kinds of businesses. utility, with a variable price paid depending on time and distance. Now Some of these technological changes are occurring in the routers and think about sharing a cab ride with someone. Your cab ride and the switches that control data movement, but others have to do with the other person’s cab ride are two virtualized entities that are mapped way servers can be managed, and how their processing power can be into a single physical experience. This virtualized utility gets the job acquired. A key concept here is virtualization. Virtualization refers to done while minimizing expenses. an experience which retains the characteristics of a physical or logical resource, without being tied to it directly. For example, the “C:” drive on your computer may represent just a portion of the physical disk on “Components at all layers are becoming virtualized, which it resides. enhancing business agility through resource flexibility and scalability. This flexibility also directly Virtualization translates into enhanced business continuity.” In the old days, servers were associated with applications on a Joe Weinman, Emerging Services one-to-one basis, so that one server handled only one application. That meant lots of machines were needed even to run a small number of applications. Today’s technology can securely partition machines Server Virtualization so that multiple applications can share a single server. These AT&T is evolving its own server virtualization offers in several phases. partitioning tools allow machines to be allocated in creative ways, The company first moved from a managed-server model to a managed running Windows in one partition and Linux in another, for example. stack, which includes the server itself and a virtualization layer (called a Each partition appears to the application running as if it were a hypervisor or kernel). Different operating systems, or different applications separate physical machine, and that allows for the consolidation of running on the same type of operating system, can run in different servers as well as innovative billing and licensing models. partitions. The next step is to offer virtual private servers (also known Virtualization can be applied to many networked IT components: as managed fractional servers) in which customers have secure, private storage, servers, firewalls, load balancers, local and wide area partitions which reside on a shared machine. To each customer, the networks and even files. When they’re combined in intelligent ways, virtual server behaves exactly like a dedicated physical server would they minimize expenses while providing flexibility in implementation (although with a potentially lower peak performance level). and scalability of resources. Virtualization enables savings through The final phase will be the addition of dynamic capacity adjustment, resource consolidation, such as storage and server consolidation, but so that minute-to-minute changes can be accommodated, even also enhances flexibility and reduces cost. if it means transferring the load to a different physical machine.
  2. 2. Next Generation Network Series - Virtualization ________________________________________________________________________________________________ 2 AT&T’s technology supports this migration of the virtual server without Similar technologies enable other types of network virtualization. interrupting the running application, providing the maximum flexibility They can provide for storage virtualization, to make a pool of in server virtualization. heterogeneous storage devices look like a single large storage device. They can also virtualized firewalls and load balancers, so that In addition to server virtualization, AT&T is also virtualizing core SONET a customer can gain access to and pay for a portion of a physical bandwidth through a technology called Virtual Concatenation. Rather network device. Virtualization can even be applied to other IT than purchasing an OC-3 or an OC-12 or an OC-48, customers will be components such as files and applications. able to use an OC-12’s worth of bandwidth (roughly 622 Megabits per second), and then increase it or decrease it to provide the equivalent This ability to virtualize the components of the computing environment of an OC-13, OC-14, or OC-11 or OC-10 (technically referred to as an is one of the key features of the next generation network. 13xSTS-1, 14xSTS-1, etc.) These dynamic increases and decreases in bandwidth can occur in a matter of seconds, offering true bandwidth on demand. For more information contact your AT&T Representative or visit us at www.att.com/business. 04/23/07 AB-1061 © 2007 AT&T Knowledge Ventures. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Knowledge Ventures.