Efficiently Distributing Knowledge of Device State in a Clustered System
Original Publication Date: 2004-Sep-29
Included in the Prior Art Database: 2004-Sep-29
Disclosed is an Enterprise Storage System (ESS) which is organized as follows: it has two or more clusters, a cluster  is composed of one or more ranks and a rank is composed of one or more logical volumes. Each cluster element needs to determine the state of volumes on both clusters. When a cluster queries the state of a remote volume, i.e., a volume that is owned by the other cluster, a remote call is executed. On a typical ESS such queries are frequent. We address the problem of minimizing the remote queries while not impacting normal system operations.