A modular architecture for the Grid

In a SQL scenario, the structure of the Grid is not bound to the hierarchical tree induced by an LDAP tree.

Therefore we need to introduce a structure, that will be used to index the database and improve performance.

The case of resources that are bound to a node is quite different from the case of resources that represent communication between nodes: the former grow with the number of nodes, the latter with its square.

As a consequence, representing communication resources using end-to-end characteristics may limit the scalability of a monitoring architecture.

In addition, availability of end-to-end mesurements implies that:

• nodes that host Grid resources also support network monitoring protocols and
• each pair of nodes hosting Grid resources should generate network monitoring traffic, with an increment of network load that is a square of the nodes.

Therefore it would be appropriate to partition the nodes in the Grid so that the number of partitions is remarkably smaller than the number of nodes: we call domains these partitions.

The monitoring activity should be limited to communications between domains.

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