I am trying to use hibernate second level cache and was looking to see what Cache provider to choose. After reading about Oscache, I thought in general it seems to be cluster aware. However hibernate's docs (http://www.hibernate.org/hib_docs/reference/en/html/performance.html#performance-cache) does not say that org.hibernate.cache.OSCacheProvider is cluster safe. What does this mean? Can I not use this in clustered environment?