A technique uniquely identifies block context signatures in a storage volume hierarchy of a storage system. In particular, the technique assigns unique volume identifiers (“IDs,” e.g., buffer tree or “bufftree” IDs) to volumes of the storage volume hierarchy, and allows clone volumes to determine...http://www.google.de/patents/US7996636?utm_source=gb-gplus-sharePatent US7996636 - Uniquely identifying block context signatures in a storage volume hierarchy
