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Is Infinispan the right choice to make sure the data is synchronized (possibly with a latency due to the outage of the LAN) and in avaliable in all locations?
It could be, perhaps with some additional work. ISPN-29 may help, where your central office could maintain an Infinispan cluster with the server module, and remote clients connect, load data and cache in a local Infinispan cluster at each site. You would need to use expiration for state locally stored, forcing a remote fetch periodically, but this depends on how often your data changes.
Another approach may be to use a RemoteCacheStore - ISPN-27 - to lazily load stuff from the central office, but again this would depend on what your data access requirements are like. You could use preloads with ISPN-27.
Can Infinispan be used as the basis for a service/computation grid?
Yes, this is on the roadmap - see ISPN-39.