Roman Pletka  Roman 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


2020

Reducing block calibration overhead using read error triage
Sasa Tomic, Timothy Fisher, Nikolaos Papandreou, Roman Pletka, Nikolas Ioannou, Charalampos Pozidis, Aaron Fry
US Patent 10,783,024
Abstract

Adaptive read voltage threshold calibration in non-volatile memory
Roman Pletka, Nikolaos Papandreou, Sasa, Tomic, Nikolas Ioannou, Charalampos Pozidis, Timothy Fisher, Aaron Fry
US Patent 10,699,791
Abstract

Methods for read threshold voltage shifting in non-volatile memory
Nikolas Ioannou, Charalampos Pozidis, Nikolaos Papandreou, Roman Pletka, Sasa Tomic, Aaron Fry, Tim Fisher
US Patent 10,658,054
Abstract

Mitigating asymmetric transient errors in non-volatile memory by proactive data relocation
Roman Pletka, Nikolaos Papandreou, Sasa Tomic, Nikolas Ioannou, Aaron Fry, Tim Fisher
Us Patent 10,656,847
Abstract

Updating prefix codes for pseudo-dynamic data compression
Thomas Parnell, Thomas Mittelholzer, Roman Pletka, Tobias Blaettler, Charalampos Pozidis, Nikolaos Papandreou, Charles Camp
US Patent 10,700,702
Abstract

Logical to physical table restoration from stored journal entries
Charles Camp, Timothy Fisher, Aaron Fry, Nikolas Ioannou, Roman Pletka, Lincoln Simmons, Sasa Tomic
US Patent 10,621,051
Abstract

Calibration of open blocks in NAND flash memory
Nikolaos Papandreou, Roman Pletka, Sasa Tomic, Nikolas Ioannou, Charalampos Pozidis, Aaron D. Fry, Timothy Fisher
US Patent 10,614,881
Abstract

Background mitigation reads in a non-volatile memory system
Nikolaos Papandreou, Sasa Tomic, Roman Pletka, Nikolas Ioannou, Charalampos Pozidis, Aaron Fry, Tim Fisher
US Patent 10,552,063
Abstract

Techniques for dynamically adjusting over-provisioning spaces of a flash controller based on workload characteristics
Nikolas Ioannou, Thomas Parnell, Roman Pletka, Sasa Tomic, Aaron Fry, Tim Fisher, Charles Camp
Us Patent 10,592,110
Abstract

Corrupt LBA recovery scheme using multiple data protection layers with different sector/page sizes
Roman Pletka, Christopher Dennett, Tim Fisher, Robert Galbraith, Kevin Sallese
US Patent 10,552,243
Abstract

Health-aware garbage collection in a memory system
Sasa Tomic, Roman Pletka
US Patent 10,552,288
Abstract


2019

Metadata hardening and parity accumulation for log-structured arrays
Ioannis Koltsidas, Charles Camp, Nikolas Ioannou, Roman Pletka, Antonios Kourtis, Sasa Tomic, Radu Stoica, Christopher Dennett, Andrew Walls
US Patent 10,437,670
Abstract

Accelerating garbage collection of flushed logical erase blocks in non-volatile memory
Roman Pletka, Nikolaos Papandreou, Sasa Tomic, Nikolas Ioannou
US Patent 10,459,839
Abstract

Techniques for reducing read voltage threshold calibration in non-volatile memory
Matt Reuter, Sasa Tomic, Nikolaos Papandreou, Timothy Fisher, Aaron Fry, Roman Pletka, Nikolas Ioannou, Charalampos Pozidis
US Patent 10,453,537
Abstract

Adaptive health grading for a non-volatile memory
Sasa Tomic, Roman Pletka
US Patent 10,254,981
Abstract

Endurance enhancement scheme using memory re-evaluation
Charles Camp, Timothy Fisher, Aaron Fry, Nikolas Ioannou, Ioannis Koltsidas, Roman Pletka, Sasa Tomic
US Patent 10,339,048
Abstract

Detecting error count deviations for non-volatile memory blocks for advanced non-volatile memory block management
Charles Camp, Timothy Fisher, Aaron Fry, Nikolas Ioannou, Roman Pletka, Sasa Tomic
US Patent 10,372,519
Abstract

Storage array management employing a merged background management process
Charles Camp, Timothy Fisher, Aaron Fry, Nikolas Ioannou, Roman Pletka, Lincoln Simmons, Sasa Tomic
US Patent 10,365,859
Abstract

Threshold voltage shifting at a lower bit error rate by intelligently performing dummy configuration reads
Nikolas Ioannou, Nikolaos Papandreou, Roman Pletka, Sasa Tomic
US Patent 10,170,195
Abstract

Storing data in a distributed file system
Nikolas Ioannou, Ioannis Koltsidas, Anil Kurmus, Roman Pletka, Alessandro Sorniotti, Thomas D Weigold
US Patent 10.169,363
Abstract


2018

Reducing write amplification in solid-state drives by separating allocation of relocate writes from user writes
Sasa Tomic, Ioannis Koltsidas, Nikolas Ioannou, Roman Pletka, Charles Camp, Timothy Fisher, Aaron Fry
US Patent 10,162,533
Abstract

Selective population of secondary cache employing heat metrics
Lokesh Gupta, Evangelos Eleftheriou, Ioannis Koltsidas, Xiao-Yu Hu, Roman Pletka, Robert Haas, Stephen Blinick, Michael Benhase, Kevin Ash
US Patent 10,152,423
Abstract

Reducing read disturb effect on partially programmed blocks of non-volatile memory
Charles Camp, Timothy Fisher, Thomas Griffin, Thomas Mittelholzer, Nikolaos Papandreou, Thomas Parnell, Roman Pletka, Charalampos Pozidis, Gary Tressler, Sasa Tomic
US Patent 10,115,472

Logical to Physical Table Restoration from Stored Journal Entries
Charles Camp, Nikolas Ioannou, Roman Pletka, Sasa Tomic, Timothy Fisher, Aaron Fry, Lincoln Simmons
US Patent 9,904,607

Wear Leveling of a Memory
Timothy Fisher, Aaron Fry, Nikolas Ioannou, Ioannis Koltsidas, Jason Ma, Roman Pletka, Lincoln Simmons, Sasa Tomic
US Patent 9,857,986

Background Threshold Voltage Shifting Using Base and Delta Threshold Voltage Shift Values in Non-volatile Memory
Charles Camp, Timothy Fisher, Aaron Fry, Nikolas Ioannou, Ioannis Koltsidas, Nikolaos Papandreou, Thomas Parnell, Roman Pletka, Charalampos Pozidis, Sasa Tomic
US Patent 9,864,523

Data Deduplication with Reduced Hash Computations
Timothy J. Fisher, Nikolas Ioannou, Thomas Parnell, Roman Pletka, Sasa Tomic
US Patent 9,858,141

Cooperative data deduplication in a solid state storage array
Timothy J. Fisher, Nikolas Ioannou, Ioannis Koltsidas, Roman A. Pletka, Sasa Tomic
US Patent 10,013,169

Non-volatile memory system having an increased effective number of supported heat levels
Charles J. Camp, Timothy J. Fisher, Aaron D. Fry, Nikolas Ioannou, Ioannis Koltsidas, Roman Pletka, Sasa Tomic
US Patent 10,078,582


2017

Non-volatile Memory Controller Cache Architecture with Support for Separation of Data Streams
Charles Camp, Tim Fisher, Aaron Fry, Nikolas Ioannou, Ioannis Koltsidas, Roman Pletka, Sasa Tomic, Andrew Walls
US Patent 9,779,021

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

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 De-straddling Data Pages in Non-volatile Memory
Ioannou, N. Camp, C. Fisher, T. Parnell, T. Pletka, R. Tomic, S.
US Patent 9,870,285

Wear Leveling of a Memory
Ioannou, N., Fisher, T. Fry, A. Koltsidas, I. MA, J. Pletka, R. Simmons, L. Tomic, S.
US Patent 9,857,986

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

DATA DEDUPLICATION WITH REDUCED HASH COMPUTATIONS
Fisher, T. Ioannou, N. Parnell, T. Pletka, R. Tomic, S.
US Patent 9,575,681


2014

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 Application 20160070715A1

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 9,632,927

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 9,563,373

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 9,342,245

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 9,342,458

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 9,274,882

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

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 9,558,107

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

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 8,700,949


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 9,256,527

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 8,655,919



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