Just an FYI, I'm starting to put together some thoughts here:
https://community.jboss.org/wiki/FileCacheStoreRedesign
Feel free to add more ideas, etc.
Cheers
Manik
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Manik Surtani
manik@jboss.org
twitter.com/maniksurtani
Lead, Infinispan
http://www.infinispan.org