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Abstract

Systems and methods for improved I/O fencing for shared storage in a clustered or grid computing environment. I/O fencing is performed with aid from the storage system and an I/O fencing management client process. The client process detects changes in the operational status of any of the clustered computing nodes. Upon sensing a change from a functional state to a dysfunctional state, the management client process effectuates reconfiguration of the storage system to disallow potentially destructive access by the dysfunctional node to the shared storage volumes. Upon sensing resumption of a functional status for the dysfunctional node, the client effectuates reconfiguration of the storage system to again allow desired access to the shared storage volumes by the now functional node. The client and storage system may share access to a database maintained by the client indicating the shared volumes a node may access and the initiators associated with each node.

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