onbarcode.barcode.winforms.dll free download Lesson 3 in Visual Basic .NET

Maker DataMatrix in Visual Basic .NET Lesson 3

Lesson 3
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Server Server Server Server
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Designing a Server Cluster
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Storage
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Figure 7-13 A cluster using a Fibre Channel switched fabric network
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An FC-SW network that is wholly dedicated to giving servers access to data storage devices is a type of SAN. Building a SAN to service your server cluster provides the greatest possible amount of flexibility and scalability. You can add nodes to the cluster by installing additional servers and connecting them to the SAN, or expand the cluster s shared storage capacity by installing additional drives or drive arrays. You can also build a geographically dispersed server cluster by extending the SAN to locations in other cities.
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Creating an Application Deployment Plan
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The stateful applications that server clusters host usually have greater capabilities than the stateless applications used on Network Load Balancing clusters. This means that you have more flexibility in how you deploy the applications on the cluster. Windows Server 2003 can host the following two basic types of applications in a server cluster:
Single-instance applications Applications that can run on no more than one server at a time, using a given configuration. The classic example of a singleinstance application is the DHCP service. You can run a DHCP server with a par ticular scope configuration on only one server at a time, or you risk the possibility of having duplicate IP addresses on your network. To run an application of this type in a cluster, the application can be running on only one node, while other nodes function as standbys. If the active node malfunctions, the application fails over to one of the other nodes in the cluster.
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Clustering Servers
Multiple-instance applications Applications in which duplicated (or cloned) code can run on multiple nodes in a cluster (as in an NLB cluster) or in which the code can be partitioned, or split into several instances, to provide complementary services on different cluster nodes. With some database applications, you can cre ate partitions that respond to queries of a particular type, or that furnish informa tion from a designated subset of the database.
Deploying Single-Instance Applications
Deploying one single-instance application on a cluster is simply a matter of installing the same application on multiple nodes and configuring one node to be active, while the others remain passive until they are needed. This type of deployment is most com mon in two-node clusters, unless the application is so vital that you feel you must plan for the possibility of multiple server failures. When you plan to run more than one single-instance application on a cluster, you have several deployment alternatives. You can create a separate two-node cluster for each application, with one active and one passive node in each, but this requires having two servers standing idle. You can create a three-node cluster, with two active nodes, each running one of the applications, and one passive node functioning as the standby for both applications. If you choose this configuration, the passive node must be capable of running both applications at once, in the event that both active nodes fail. A third configuration would be to have a two-node cluster with one application running on each, and each server active as a standby for the other. In this instance, both servers must be capable of running both applications.
Capacity Planning
This talk of running multiple applications on a server cluster introduces one of the most important elements of cluster application deployment: capacity plan ning. The servers in your cluster must have sufficient memory and enough pro cessing capabilities to function adequately in your worst-case scenario. For example, if your organization is running five critical applications, you can cre ate a six-node cluster with five active nodes running the five applications and a single passive node functioning as the standby for all five. If your worst-case sce nario is that all five active nodes fail, the single passive node had better be capa ble of running all five applications at one time with adequate performance for the entire client load. In this example, the possibility of all five active nodes failing is remote, but you must decide on your own worst-case scenario, based on the importance of the applications to your organization.
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