7.2.2.Reflexions on the networks One easily made interconnection is one significant advantage for the geographically gone project management, it means when development equip members are situated on far sites. Associated to the development tools appropriated gone(for example, the managers of configuration, registering of errors, access control, electronic correspondence), one interconnection can supply necessary environment for creating from the distinct groups. For the project chief, the open networks allow also not imposing platform of identical development. One open network can have the far developers using posts of work Sun, PC or Informix. It is not any case here to advice to project chiefs to encourasge the utilization by their developers of different platforms, but to signal that it is possible. In the application environments, the network supplies also one excellent infrastructure for the gone destinary systems,such as: - IT network: professional bibliographic reseaches - Financial system: bank, credit octroi - Access control: identification system, immigration control There are fundamentally articulated systems around the given basis and don’t have the unique central given bank. This is the network relying the different stockage centers of given and integrate in one unique access system. The client/server architectures are well appropriated in order to manage the application type in network. 7.3. The advantages and inconveniences of one client/server environment. For the project chief, client/server architecture, at other architecture of IT system, including at the same time the advantages and inconveniences. The system qualities(or their absence) can have one impact on the manner which project is developed. They influence, at the same time the cible environment, and development environment. The client/server architecture advantages include: -the dividing of resources The resources are used more efficace due to the possibility of divide their using between users. - The less costs: the initial cost of one client/server system is less than other kinds of mini user systems for the most. Furthermore, the cost of one augmentation of the capacity of system can be inferior also. - Beginning small and grow: it is not necessary that the project chief fixed from the beginning of the system form; it can begin small and grow in functioning of demands. - The reduction of systems(decentralisation of treatment) - Not of falling down due to the unique fault: the risk of falling down of the ensembly of system in the reason of one unique fault is less important than other kinds of systems, also fault of one client computer of not having habitual incidence based on the others. - Access ton gone given: client/server architecture is one excellent means to supply one access to the gone given for one important number of users in allowing access to the basis of server given due to the important networks. - -facility of supplementing one new client: the client/server system can bigger easily and not limited theorically, in connecting the client computer supplementary to the network. - Completing to the relatively simple server: There is not the limite to the server number which counld be connected to the client’server system supplying one power of supplementary treatment, peripherics, one power of accessing to given and functions of system management. Unhappily, client/server architecture present also some inconveniences: - System administration: the system administration regulation could be difficult to set up in the reason of high liberty degree existing always at the level of client station./ For example, the given can be stocked locally on the client computer not connected into the global system saver. - The server surcharge: - The complementing to server easily signifies not strongly that the servers are supplemented or retired frequently. Then, the servers stay surcharged, that provoke long files of attendant while the capacity of CPU is surpassed, or the local network or transmissions are surcharged, or espace disc is surpassed. In generally, the response time at the time that the demand is stronger, can become mediocre. Although these problems could appear in all kind of systems, they have intention of growing client/server environment. - The number limited of users having access to modules: When the clients divide the using one of the application module(for example), one graphic module or one tool GLAO), they can be limited by the computer number having the authorization of using simultaneously the module. That signifies that one essay for charging one application sometimes negative. - One difficult maintenance: Client/server important can understand different computers, peripherics and other material composants: servers,clients, imprimants, discs, routers etc… The plethora maintenance of IT material is one always extremely laborious task. - One difficult management: The client/server development environment management can be difficult, almost when the servers confers to developers in important independence degree. That is paplrticularly right for the geographically gone development environments. - Security: The access control security can be difficult to be controlled. It can have a lot of given bases to be protected in different places. The important number of user having access to system can send also extremely difficult the surveillance and the control. That is why it must more than one or 2 measures of security in order to protect one client/server complete network
Posted on: Fri, 12 Jul 2013 03:16:46 +0000
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