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A cluster is a group of servers that appears to users as a single resource, and which provides high availability, reliability, and scalability for specific applications. A server cluster is a group of servers running a stateful application, such as a database server, and sharing a common data store. Servers in this type of cluster can be configured as active or passive nodes. A Network Load Balancing cluster is a group of servers running a stateless applica tion, such as a Web server, each of which has an identical, independent data store. Scaling out is the process of adding more servers to an existing cluster, while scal ing up is the process of upgrading the hardware of servers already in a cluster. Geographically dispersed clusters have servers in different locations. If the cluster is a server cluster, it requires a long-distance storage area network to provide the common data store. NLB typically uses separate clusters at each location, with a technique like DNS round robin to distribute client requests among the clusters.

Property: when True, means that the control is displayed on the form. Property: contains the width of the control in points. Method: moves the control to the front (fmTop) or the bottom (fmBottom) of the z-order.

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ASP.NET, although clearly inspired by MonoRail, doesn t offer in its first version a handy functionality that MonoRail developers use fruitfully areas. So what s an area in this regard Quite simply, it s a logical container of controllers. Although areas can be simulated in ASP. NET MVC 1 and in Visual Studio 2008, they are an out-of-the-box feature in ASP.NET MVC 2 and Visual Studio 2010. (See Figure 3-16.) Each controller must belong to an area, and any application must contain at least one area. If custom areas are not defined, a global and unnamed area is conventionally assumed. An area represents a section of the application and is a feature particularly suited to large Web applications developed using the MVC approach. Ultimately, each area is a sort of subapplication within the same global project. Each area, in fact, has its own set of controllers, views, shared content, models, and so forth and, more importantly, is developed in isolation.

Visible Width ZOrder (zPosition)

Of the two types of clusters supported by Windows Server 2003, Network Load Balanc ing is the easier one to install, configure, and maintain. You can use the existing hardware and applications in your computers, and there is no additional software to install. You use the Network Load Balancing Manager application in Windows Server 2003 to create, manage, and monitor NLB clusters.

Describe how Network Load Balancing works Understand the differences among the four NLB operational modes List the steps involved in deploying an NLB cluster Monitor NLB using Windows Server 2003 tools

The Height, Width, Top, and Left properties dictate the physical size and placement of the control on the form The Enabled property determines if the control can receive the focus, whereas the Visible control determines whether the control will be drawn When the Locked property is True, the user can manipulate the contents of the control but will be unable to change its value For instance, setting the Locked property to True means that the user could scroll through a large, multi-line text box to see all of the data If the Enabled property were set to False, the text box control would still be visible, but the user would be unable to scroll to see any text that isn t currently visible on screen When two controls overlap, the ZOrder method controls which one is completely visible and which one is partially or totally hidden.

A Network Load Balancing cluster consists of up to 32 servers, referred to as hosts, each of which is running a duplicate copy of the application you want the cluster to provide to clients. Network Load Balancing works by creating on each host a virtual network adapter that represents the cluster as a single entity. The virtual adapter has its own IP and media access control (MAC) addresses, independent of the addresses assigned to the physical network interface adapters in the computers. Clients address their application requests to the cluster IP address, instead of an individual server s IP address.

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