[AM] modelling the state of a service

Hi All,

How about a real world modelling question for a change?

I'm trying to come up with a nice simple way to represent the current state 
of a service, where the service consists of a number of processes spread 
over several nodes.

For example the web server part of a web service might consist of two 
clustered nodes running a web server listening to requests on port 80 and 
passing the request to another node cluster to do the actual processing. For 
the web server part of the service to be available at least one node has to 
be available, running the web server process, listening on port 80 and able 
to connect to the next tier. Other tiers would have similar combinations of 
processes so in order to say the web service is actually available a path 
through all the tiers must be traceable.

Depending on different combinations of states across the tiers you might 
want to trigger alerts to notify the state of the service to operators.

Any suggestions that don't involve multiple levels of composite states 
gratefully received.

Regards

Ian Chamberlain

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