HA applications

[Alan Cox]

> > In the field, we hardly encounter the web applications that seems to be
> > the focus of most people in the Linux HA space.
> 
> We do see deployments for HA mailservers and rather big webfarms, though I
> can't give you the names.

Its probably worth noting mailservers dont generally need true HA. Its an 
embarrasingly parallel problem with trivial conflict resolution between nodes 
after partition state ends.

There are several working algorithms for the sync in use, and people are 
actually now beginning to use tools like isync to do server/server replication
and resolution.

Alan