Roman A. Pletka  Roman A. Pletka photo       

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Research Staff Member - Master Inventor - Cloud Storage
Zurich Research Laboratory, Zurich, Switzerland
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Professional Associations

Professional Associations:  IEEE Computer Society


2017

Garbage Collection Techniques for a Data Storage System
Ahmed, R. Fisher, T. Fry, A. Ioannou, N. MA, J. Orr, M. R. Pletka, R. Simmons, L. Tomic, S.
US Patent 9,740,609

Integrating A Flash Cache Into Large Storage Systems
Ash, Kevin J and Benhase, Michael T and Eleftheriou, Evangelos S and Gupta, Lokesh M and Haas, Robert and Hsu, Yu-Cheng and Hu, Xiaoyu and Joseph, S Hyde II and Pletka, Roman A and Sanchez, Alfred E and others
US Patent 9,785,561


2016

STORING DATA IN A DISTRIBUTED FILE SYSTEM
Ioannou, Nikolas and Koltsidas, Ioannis and Kurmus, Anil and Pletka, Roman A and Sorniotti, Alessandro and Weigold, Thomas D
US Patent 20,160,070,715

REDUCING WRITE AMPLIFICATION IN SOLID-STATE DRIVES BY SEPARATING ALLOCATION OF RELOCATE WRITES FROM USER WRITES
Camp, Charles J and Fisher, Timothy J and Fry, Aaron D and Ioannou, Nikolas and Koltsidas, Ioannis and Pletka, Roman and Tomic, Sasa
US Patent 20,160,092,352

DETECTING ERROR COUNT DEVIATIONS FOR NON-VOLATILE MEMORY BLOCKS FOR ADVANCED NON-VOLATILE MEMORY BLOCK MANAGEMENT
Camp, Charles J and Fisher, Timothy J and Fry, Aaron D and Ioannou, Nikolas and Pletka, Roman and Tomic, Sasa
US Patent 20,160,110,124

Background threshold voltage shifting using base and delta threshold voltage shift values in flash memory
Camp, Charles J and Fisher, Timothy J and Fry, Aaron D and Ioannou, Nikolas and Koltsidas, Ioannis and Papandreou, Nikolaos and Parnell, Thomas and Pletka, Roman and Pozidis, Charalampos and Tomic, Sasa and others
US Patent 9,251,909


2015

Selectively enabling write caching in a storage system based on performance metrics
Camp, Charles J and Pletka, Roman and Walls, Andrew D
US Patent 9,170,943

Promotion of partial data segments in flash cache
Benhase, Michael T and Blinick, Stephen L and Eleftheriou, Evangelos S and Gupta, Lokesh M and Haas, Robert and Hu, Xiao-Yu and Kalos, Matthew J and Koltsidas, Ioannis and Nielsen, Karl A and Pletka, Roman A and others
US Patent 9,176,884

Managing cache memories
Blinick, Stephen L and Chiu, Lawrence Y and Eleftheriou, Evangelos S and Haas, Robert and Hsu, Yu-Cheng and Hu, Xiao-Yu and Koltsidas, Ioannis and Muench, Paul H and Pletka, Roman
US Patent 9,152,599

Managing metadata for caching devices during shutdown and restart procedures
Blinick, Stephen L and Dickey, Clement L and Hu, Xioa-Yu and Ioannou, Nikolas and Koltsidas, Ioannis and Muench, Paul H and Pletka, Roman and Seshadri, Sangeetha
US Patent 9,086,972

Promotion of partial data segments in flash cache
Benhase, Michael T and Blinick, Stephen L and Eleftheriou, Evangelos S and Gupta, Lokesh M and Haas, Robert and Hu, Xiao-Yu and Kalos, Matthew J and Koltsidas, Ioannis and Nielsen, Karl A and Pletka, Roman A and others
US Patent 8,935,462

Wear-level of cells/pages/sub-pages/blocks of a memory
Cideciyan, Roy D and Eleftheriou, Evangelos S and Haas, Robert and Hu, Xiao-Yu and Iliadis, Ilias and Pletka, Roman
US Patent 9,170,933

Scheduling requests in a solid state memory device
Bux, Werner and Haas, Robert and Hu, Xiao-Yu and Iliadis, Ilias and Pletka, Roman
US Patent 9,075,712

Adaptive cache promotions in a two level caching system
Benhase, Michael T and Blinick, Stephen L and Eleftheriou, Evangelos S and Gupta, Lokesh M and Haas, Robert and Hu, Xiao-Yu and Koltsidas, Ioannis and Pletka, Roman A
US Patent 8,930,624

Dynamically adjusted threshold for population of secondary cache
Benhase, Michael T and Blinick, Stephen L and Eleftheriou, Evangelos S and Gupta, Lokesh M and Haas, Robert and Hu, Xiao-Yu and Koltsidas, Ioannis and Pletka, Roman A
US Patent 8,972,662

Write cache structure in a storage system
Koltsidas, Ioannis and Pletka, Roman
US Patent 8,990,502


Selective space reclamation of data storage memory employing heat and relocation metrics
Benhase, Michael T and Eleftheriou, Evangelos S and Gupta, Lokesh M and Haas, Robert and Hu, Xiao-Yu and Kalos, Matthew J and Koltsidas, Ioannis and Pletka, Roman A
US Patent 9,158,706

EXTENDING USEFUL LIFE OF A NON-VOLATILE MEMORY BY HEALTH GRADING
Camp, Charles J and Koltsidas, Ioannis and Papandreou, Nikolaos and Parnell, Thomas and Pletka, Roman A and Pozidis, Charalampos and Tressler, Gary A and Walls, Andrew D
US Patent 20,150,177,995

Reliability scheme using hybrid ssd/hdd replication with log structured management
Eleftheriou, Evangelos S and Haas, Robert and Hu, Xiao-Yu and Pletka, Roman A
US Patent App. 14/863,093


2014

Method and system for allocating a resource of a storage device to a storage optimization operation
Hu, Xiaoyu and Ioannou, Nikolas and Koltsidas, Ioannis and Liu, Yang and Mei, Mei and Muench, Paul H and Pletka, Roman A and Wang, Zhiqiang
US Patent App. 14/472,426

NON-VOLATILE MEMORY DATA STORAGE WITH LOW READ AMPLICATION
Ioannou, Nikolas and Koltsidas, Ioannis and Mittelholzer, Thomas and Parnell, Thomas and Pletka, Roman and Pozidis, Charalampos and Tomic, Sasa
US Patent 9,710,199
Abstract

Management of partial data segments in dual cache systems
Benhase, Michael T and Blinick, Stephen L and Eleftheriou, Evangelos S and Gupta, Lokesh M and Haas, Robert and Hu, Xiao-Yu and Kalos, Matthew J and Koltsidas, Ioannis and Pletka, Roman A
US Patent 8,688,913

Cache allocation in a computerized system
Hu, Xiao-Yu and Ioannou, Nikolas and Koltsidas, Ioannis and Pletka, Roman A and Weigold, Thomas D
US Patent App. 14/253,962

Optimizing locations of data accessed by client applications interacting with a storage system
Eleftheriou, Evangelos S and Galbraith, Robert and Gerhard, Adrian C and Haas, Robert and Hu, Xiao-Yu and Iyer, Murali N and Koltsidas, Ioannis and Larson, Timothy J and Norgaard, Steven P and Pletka, Roman and others
US Patent 8,661,196

Cache memory management in a flash cache architecture
Eleftheriou, Evangelos S and Haas, Robert and Hu, Xiao-Yu and Pletka, Roman A
US Patent 8,688,900

Reducing access contention in flash-based memory systems
Eleftheriou, Evangelos S and Haas, Robert and Mueller, Peter and Pletka, Roman A
US Patent 8,725,957


2013

Page retirement in a nand flash memory system
Camp, Charles J and Koltsidas, Ioannis and Pletka, Roman A and Walls, Andrew D
US Patent App. 14/096,823

Method and device for managing a memory
Ioannou, Nikolas and Koltsidas, Ioannis and Pletka, Roman A and Tomic, Sasa and Weigold, Thomas D
US Patent 9,760,309
Abstract

Intra-block memory wear leveling
Iliadis, Ilias and Antonakopoulos, Theodoros A and Pletka, Roman and Hu, Xiao-Yu and Cideciyan, Roy D
US Patent 8,495,281


2012




2011


Logical to physical address mapping in storage systems comprising solid state memory devices
Bux, Werner and Haas, Robert and Hu, Xiao-Yu and Pletka, Roman
US Patent App. 13/812,377

Selective population of secondary cache employing heat metrics
Ash, Kevin J and Benhase, Michael T and Blinick, Stephen L and Eleftheriou, Evangelos S and Gupta, Lokesh M and Haas, Robert and Hu, Xiao-Yu and Koltsidas, Ioannis and Pletka, Roman A
US Patent App. 13/285,817


2010

Method for efficient and secure data migration between data processing systems
Pletka, Roman A and Droz, Patrick and Cachin, Christian
US Patent 7,802,102

Intra-disk coding scheme for data-storage systems
Dholakia, Ajay and Iliadis, Ilias and Haas, Robert and Hu, Xiaoyu-Yu and Eleftheriou, Evangelos S and Pletka, Roman A
US Patent 7,823,011


2009




2008

Storage System and Method for Updating a Hash Tree
Christian Cachin, Paul T Hurley, Jan Kunigk, Roman A Pletka
US Patent App. 12/171,595



2007

Encryption and authentication of data and for decryption and verification of authenticity of data
Cachin, Christian and Hurley, Paul T and Pletka, Roman A
US Patent App. 11/622,467


Flow control in network devices
Hoyt Edwin Bowen Jr, Patrick Droz, Clark D Jeffries, Lukas Kencl, Andreas Kind, Soenke V Mannal, Roman A Pletka, others
US Patent 7,260,062


2005





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