The lock management system disclosed is distributed i.e. information about which locks have been granted for a resource is stored at both a master node and at the nodes on which are located processes that desire access to the resource. A master resource object grants locks to shadow resource objects...http://www.google.com/patents/US6668270?utm_source=gb-gplus-sharePatent US6668270 - Efficiently distributing information used for lock management between distributed resource objects
