A plurality of access nodes sharing access to data on a storage network implement a directory based cache ownership scheme. One node, designated as a global coordinator, maintains a directory (e.g., table or other data structure) storing information about I/O operations by the access nodes. The other...http://www.google.ca/patents/US7975018?utm_source=gb-gplus-sharePatent US7975018 - Systems and methods for providing distributed cache coherence
