I use command caching for growing performance of my application. My application works on a server divided on 2 clusters. The information puts in the cache are never invalidated (timeout = -1). This information are only invalidated on demand. How can I configure the sharing-policy (SHARED-PUSH,SHARED-PULL or SHARED-PUSH-PULL) in my cachespec.xml file for having always the good cache on each cluster ? (cachespec.xml is one each cluster). How does it works when I invalidate cluster in a cluster ?