Abstract: A high tier storage area stores a stub file and a lower tier cloud storage area stores the file corresponding to the stub file. When a client apparatus requests segments of the file from the high tier storage area, reference is made to the stub file to determine a predicted non-sequential pattern of requests to the segments by the client apparatus. The high tier storage area follows the predicted non-sequential pattern of requests to retrieve the segments of the file from the cloud prior to the client apparatus actually requesting the segments. As such, the file may be efficiently provided to the client apparatus while also efficiently storing the file on the lower tier cloud storage area.

Abstract: A high tier storage area stores a stub file and a lower tier cloud storage area stores the file corresponding to the stub file. When a client apparatus requests segments of the file from the high tier storage area, reference is made to the stub file to determine a predicted non-sequential pattern of requests to the segments by the client apparatus. The high tier storage area follows the predicted non-sequential pattern of requests to retrieve the segments of the file from the cloud prior to the client apparatus actually requesting the segments. As such, the file may be efficiently provided to the client apparatus while also efficiently storing the file on the lower tier cloud storage area.

Abstract: A NAS server runs a native filesystem application that manages the filesystem and also includes a virtualization component that allows third-party data processing applications to run on the NAS server substantially as though running on a separate server while allowing the applications to access filesystem information without use of the network and without the overhead of network protocols and related operating system processing. The virtualization component intercepts certain filesystem-related system calls made by the application and directs processing of those filesystem-related system calls (e.g., by the virtualization component or by the native filesystem application), bypassing certain operating system processes including those relating to network protocol processing.

Abstract: A system for disaster recovery rehearsals using copy-on-write may include a data set of an application and a disaster recovery manager. The disaster recovery manager may be configured to perform a disaster recovery rehearsal using a copy-on-write snapshot of the data set.

Abstract: The present invention provides a framework for managing both clustering and data replication in a software system distributed across multiple nodes. The framework includes at least one agent running at nodes comprising the distributed system. The framework also includes a master to coordinate clustering and replication operations. The framework further includes a library of software programs, called primitives, that are used by agents to communicate with the master. The agent(s) obtain cluster status information and replication status information, which are used by the master to manage clustering and replication operations. The framework is designed to work with existing cluster management applications and data replication facilities. The framework provides status information needed for coordinating clustering and replication operations to ensure that applications and data remain in a consistent state for disaster recovery purposes.