Storage Technology Corporation

Cray Research, Inc.

Michael W Booth

Ravi Kumar Kavuri

Troy Raymond Pesola

A volume translation apparatus and method are provided. The volume translation apparatus resides between host machines and the physical storage devices accessed by the host machines. This volume translation apparatus may perform volume translation for the control path and optionally the data path of input/output (I/O) requests sent by the host machines to the physical storage devices. Control path translation ensures that the correct physical volumes are mounted for accessing by the I/O request. Because the physical volume may be different from that requested by the host machine application, the translation device includes a mapping that represents which physical volumes represent copies of the virtual volume used by the host machine application. When an I/O request is received and is directed to a particular original virtual volume, the volume mapping apparatus translates the original virtual volume identification into one or more physical volume identifications associated with a secondary virtual volume which may or may not be the same as the original virtual volume.

Volume translation apparatus and method

A data processing system, method, and product are disclosed for maintaining a database of usage information of multiple, different physical devices. A virtualization system is provided interposed between a host computer system and the physical devices. The host computer system is capable of accessing only virtual interfaces and is incapable of directly accessing any of the physical devices. A relational database is established within the virtualization system for storing information. Information is stored in the database about transactions processed by the virtualization system utilizing the physical devices. The information stored in the database includes error information and information about the usage of the physical devices. The information in the database may be accessed by the host computer system.

Method, system, and product for maintaining within a virtualization system a historical performance database for physical devices

A vector update method for vectorizing loops containing recursive equations within a supercomputer. Program code containing a loop is transformed into a nested loop in which the interior loop performs an integer number of iterations of the original loop equal to the vector length of the system. Vector operations are executed on the arrays of data within the interior loop, a check is made for recurring data points and repairs are made to the results of the vector operations. All repairs are completed before exiting the interior loop.

Growing community of inventors

Apple Valley, MN, United States of America

Michael W Booth