[Linux-cluster] Link monitor under Red Hat Cluster Suite v3

[Patton, Matthew F, CTR, OSD-PA&E]

Classification: UNCLASSIFIED

> Since we have the "monitor link" check box "on" for the virtual IP, I 
> imagined that the clumanager would notice the link absense and thus 
> migrate the service to the other node.

I doubt your (or the default) configures cluster services to respond to
/etc/sysconfig/network-functions:do_netreport(). I think this is a perfect
application but have no idea if the function even works or if the cluster
daemons respond to a SIGIO in a useful manner. I also don't see how losing
carrier is going to trigger this function on it's own. Does clumanager
really watch link status? In all liklihood you're still going to have to
come up with a script etc. that monitors interfaces and when it notices a
link going down, invokes the alert mechanism.
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