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Matthew J Kalos, Michael T Benhase, James C Chen, Patricia C Lu: Efficient accumulation of performance statistics in a multi-port network. International Business Machines Corporation, Dan Shifrin, October 3, 2006: US07117118 (6 worldwide citation)

Computer networks are provided with a resource efficient ability to generate link performance statistics. Two counters accumulates the number of I/O operations processed by a link and the time required by the link to complete each I/O operation. The average link utilization per I/O operation may the ...


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James C Chen, Minh Ngoc L Huynh, Matthew J Kalos, Chung M Fung: Decreased response time for peer-to-peer remote copy write operation. International Business Machines Corporation, Dan Shifrin, November 3, 2009: US07613785 (3 worldwide citation)

Methods, system and computer program product are provided to improve the efficiency of data transfers in a PPRC environment. Any or all of three features may be implemented, each of which reduces the number of round trips required for the exchange of handshaking, data and control information. A firs ...


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Matthew J Kalos, Michael T Benhase, James C Chen, Patricia C Lu: Efficient accumulation of performance statistics in a multi-port network. International Business Machines, Law Office Of Dan Shifrin PC IBM, February 23, 2006: US20060041664-A1

Computer networks are provided with a resource efficient ability to generate link performance statistics. To calculate the average link utilization per I/O operation, a first counter accumulates the number of I/O operations processed by a link and a second counter accumulates the time required by th ...


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Matthew J Kalos, Michael T Benhase, James C Chen, Patricia C Lu: Efficient accumulation of performance statistics in a multi-port network. Ibm Corporation, Law Office Of Dan Shifrin PC IBM, April 5, 2007: US20070076627-A1

Computer networks are provided with a resource efficient ability to generate link performance statistics. To calculate the average link utilization per I/O operation, a first counter accumulates the number of I/O operations processed by a link and a second counter accumulates the time required by th ...


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Christopher R Zook: ECC system for generating a CRC syndrome over randomized data in a computer storage device. Cirrus Logic, Howard H Sheerin, Dan Shifrin, April 18, 2000: US06052815 (80 worldwide citation)

An error correction processor is disclosed for correcting errors in randomized data read from a disk storage medium, where the randomized data comprises ECC redundancy symbols generated over the randomized data and check symbols generated over data before being randomized. The error correction proce ...


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Marvin L Vis, Christopher P Zook: Sampled amplitude read channel employing a post processor with a boundary error compensator which compensates for boundary error events in a split-field data sector. Cirrus Logic, Dan Shifrin, March 4, 2003: US06530060 (73 worldwide citation)

A sampled amplitude read channel is disclosed for reading a data sector recorded on a disk storage medium by detecting an estimated data sequence from a sequence of read signal sample values generated by sampling an analog read signal emanating from a read head positioned over the disk storage mediu ...


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G Diwakar Vishakhadatta, Jerrell P Hein: Method to improve the jitter of high frequency phase locked loops used in read channels. Cirrus Logic, Richard D Egan, Dan Shifrin, August 29, 2000: US06111712 (72 worldwide citation)

A system and method is provided to improve the jitter performance of high frequency synthesizers used in read/write channel circuits. The frequency synthesizer is implemented with multiple phase locked loops arranged in a cascaded fashion to increase the update rates at which the cascaded loops oper ...


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Tyson Tuttle, Diwakar Vishakhadatta, Jerrel P Hein, David R Welland, David E Reed, Richard T Behrens, William G Bliss, Paul M Romano, Trent O Dudley, Christopher P Zook: Sampled amplitude read channel employing pipelined reads to reduce the gap between sectors. Cirrus Logic, Dan Shifrin, Howard Sheerin, November 11, 2003: US06646822 (71 worldwide citation)

A sampled amplitude read channel incorporated within a magnetic disk storage system for reading data recorded tracks on a magnetic medium, where the data comprises user data sectors recorded at varying data rates across a plurality of predefined zones and embedded servo data sectors recorded at the ...


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Gary D Hicok, Jeffery M Michelsen: Memory manager for multi-media apparatus and method therefor. Cirrus Logic, Robert P Bell, Dan Shifrin, Peter Rutkowski, July 24, 2001: US06266753 (64 worldwide citation)

A virtual memory manager for a multi-media engine allows individual media units to operate in their own virtual space in much the same way as a software program operating in virtual mode. The virtual memory controller performs address translation or mapping to the correct physical memory location (i ...


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Thomas C Jarvis, Ronald M Kern: Invalidation of storage control unit cache metadata. International Business Machines Corporation, Dan Shifrin, March 4, 2008: US07340652 (64 worldwide citation)

Method, apparatus and program product are provided for the invalidation of faulty metadata in a storage controller coupled to a host device. Faulty metadata may include metadata which no longer matches the associated customer data tracks stored on a DASD or other storage device. When faulty metadata ...