A network of concepts
We have defined three concepts:
- edge service: a Grid service provided by a
host or cluster;
- domain: a set in a partition of the edge
- network service: a Grid service provided by the
communication infrastructure to two domains.
We need two more key concepts in order to complete our model:
theodolite service and multihome.
A theodolite service is an instance of edge service, which consists
in representing an entry point of a certain domain. For
in a best effort based Grid, it may consist in a node that
hosts monitoring tools, and is a target for theodolites of
in a differentiated services based Grid, it may implement
what RFC 2475 calls an ingress or egress point.
A multihome is an entity that collects several aliases of
the same edge service, when they must be included into different
domains in order to comply with the basic requirement (an example
next: A simple example
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up: Monitoring the Connectivity of a Grid