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Grids that use the concept of services are generally based on highly centralized hierarchical architectures. The main issue of this centralization is the unified management of resources, but it is difficult to react rapidly against failure that can affect grid users. Therefore, in our previous works, we proposed a specification called P2P4GS for services management in a grid-computing environment based on peer-to-peer paradigm. In this approach, all nodes can participate to the deployment and the discovery processes for a given service. In addition, each node maintains a table called "Service Registry", which lists the services owned by this node, as well as the other services located inside the grid and learned during a discovery process. However, the growth of the distributed systems size, in terms of number of nodes, services and users, raises the question of scalability. In this paper, we propose to limit the knowledge about the location of grid services on some nodes that we call ISP (Information System Proxy). Around each ISP, we form a community constituted by a set of nodes of the grid. In order to reduce the ISP overload, on the one hand, we delegate invocation and execution services tasks for nodes called IP (Invocation Proxy). On the other hand, we memorize information about the location of frequently requested services on LP (Location Proxy) nodes.

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