Sun Microsystems, Inc.

Howard Alt

William Lee Duncan

A computing system operates a volume management system to manage accesses to the storage of information and provides to the users of the volume management system parallel process paths for accessing a storage device is as an access volume operation or as an access device operation. Further the volume management system prevents the two parallel logical operations from conflicting with each other by performing an open volume operation and an open device operation. These operations indirectly communicate by setting and clearing characteristics in stored volume data characteristics that they share for each device being accessed. The characteristics include an open count to track the open status of a device and an exclusive flag to track whether the storage device has been opened exclusively by either the open volume or the open device operation request from a user.

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Howard Alt