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ZoneAlloy: Elastic Data and Space Management for Hybrid SMR Drives

Fenggang Wu, Bingzhe Li, Zhichao Cao, Baoquan Zhang, Ming-Hong Yang, Hao Wen, David H. C. Du
2019 USENIX Workshop on Hot Topics in Storage and File Systems  
In this paper, we present ZoneAlloy, an elastic data and space management scheme for H-SMR drives, to explore the benefit of using such drives.  ...  However, there is little research on how to efficiently manage data and space in such H-SMR drives.  ...  What are the possible/potential use cases for H-SMR? What are the other possible abstractions and application models of the Hybrid SMR drive?  ... 
dblp:conf/hotstorage/WuLCZYWD19 fatcat:gqnqh5vjqfgjlnoeu3wevh4aay

ZEA, A Data Management Approach for SMR

Adam Manzanares, Noah Watkins, Cyril Guyot, Damien Le Moal, Carlos Maltzahn, Zvonimir Bandic
2016 USENIX Workshop on Hot Topics in Storage and File Systems  
SMR Drive Models The shingling constraint of an SMR device can be managed either at the drive-level, or at the host-level in software.  ...  This is promising work, but there are currently no SMR HDDs that support this model. 1b represents the per-write metadata that ZEA places on a SMR zone.  ... 
dblp:conf/hotstorage/ManzanaresWGMMB16 fatcat:f672py2ljnbopblm3m4x7lnpqe

HiSMRfs: A high performance file system for shingled storage array

Chao Jin, Wei-Ya Xi, Zhi-Yong Ching, Feng Huo, Chun-Teck Lim
2014 2014 30th Symposium on Mass Storage Systems and Technologies (MSST)  
HiSMRfs can manage raw SMR drives and support random writes without remapping layer implemented inside SMR drives.  ...  Data writing is done through sequential appending style and store in a SMR drive. HiSMRfs includes a file/object-based RAID module for SMR/HDD arrays.  ...  Data Writes/Updates of a SMR Drive There are two main ways that a SMR drive performs data writes/updates.  ... 
doi:10.1109/msst.2014.6855539 dblp:conf/mss/JinXCHL14 fatcat:kw3umzjt6rhvlki62jdai5c5za

A Wind Turbine Emulator Using Field-Oriented Induction Motor

Yi-Chun Hsu, Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROC, Min-Ze Lu, Chang-Ming Liaw, Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROC, Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROC
2020 Journal of energy and power technology  
This paper presents key issues for establishing a high-performance IFO IM drive.  ...  The maximum power point tracking (MPPT) function with good performance for the PMSG with Vienna SMR is achieved using the perturb and observation (P&O) approach.  ...  The results depict superior driving performances.  ... 
doi:10.21926/jept.2102018 fatcat:w6vf6wdcu5axtibju3tscwt36m

Some Basic Issues and Applications of Switch-Mode Rectifiers on Motor Drives and Electric Vehicle Chargers [chapter]

C. M., Y. C.
2011 Electrical Generation and Distribution Systems and Power Quality Disturbances  
Performance evaluation The SMR fed SRM drive is shown in Fig. 21 .  ...  Dynamic model estimation i.  ... 
doi:10.5772/20151 fatcat:celzkkly2bfxfnscs3ldistjou

Interconnected Operations of Electric Vehicle to Grid and Microgrid

Ganisetti Vijay Kumar, Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROC, Min-Ze Lu, Chang-Ming Liaw, Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROC, Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROC
2020 Journal of energy and power technology  
The EV motor drive boostable DC-link voltage is established by a battery through a bilateral interface boost-buck DC-DC converter for good driving performance over a wide speed range.  ...  In idle conditions, the embedded interface converter and inverter of the motor drive can be arranged to perform the G2V/V2G operations by adding external LC low-pass filters.  ...  The fast-tracking and regulation of DClink voltage responses can enhance the EV SynRM driving performance.  ... 
doi:10.21926/jept.2102023 fatcat:ovjlwpey3zdm5khjmib7vkp5eu

Investigating associations between ICU level and quality of care in the Netherlands: reporting only SMRs is not the whole story

Armand R. J. Girbes, Margreeth B. Vroom, Michael A. Kuiper, Annemarie M. G. A. de Smet, Marcus J. Schultz
2015 Intensive Care Medicine  
As highlighted very recently, performance assessment requires better case-mix adjustment than is currently available in the APACHE IV model, especially given the growing role of outcomes in driving prospective  ...  SMRs can be confounded by case-mix differences since the SMR is calculated using a logistic regression model, and a wellknown and previously reported serious problem of this model is that it underestimates  ... 
doi:10.1007/s00134-015-3908-9 pmid:26077093 fatcat:eptvhg3jkvgbbchenbtbutd5se

Numerical Investigation of the Sorption Enhanced Steam Methane Reforming in a Fluidized Bed Reactor

Zhongxi Chao, Yuefa Wang, Jana P. Jakobsen, Maria Fernandino, Hugo A. Jakobsen
2012 Energy Procedia  
The sorption enhanced steam methane reforming (SE-SMR) in a laboratory scale fluidized bed reactor is investigated using a three-fluid model.  ...  CO 2 can always play the role of sorption enhancement, the hydrogen purity at the outlet is between 98-99% before the breakthrough, which is much higher than that (73-74%) of steam methane reforming (SMR  ...  level models for design and optimization of fluidized bed processes) of the Norwegian Research Council are gratefully appreciated.  ... 
doi:10.1016/j.egypro.2012.06.005 fatcat:mr3bnt5jfrgtpbj3bi2lm32isq

SMORE: A Cold Data Object Store for SMR Drives (Extended Version) [article]

Peter Macko, Xiongzi Ge, John Haskins Jr., James Kelley, David Slik, Keith A. Smith, Maxim G. Smith
2017 arXiv   pre-print
An index stored on flash and backed up to the SMR drives maps object identifiers to on-disk locations.  ...  Read performance declines for smaller object sizes where inter- object seek time dominates.  ...  on the SMR drives.  ... 
arXiv:1705.09701v1 fatcat:2bnfjqi2enbanmjs5dxeisazte

Virtual Guard: A Track-Based Translation Layer for Shingled Disks

Mansour Shafaei, Peter Desnoyers
2017 USENIX Workshop on Hot Topics in Storage and File Systems  
We compare performance of Vguard to an available drive-managed SMR drive analyzed and modeled in previous research.  ...  Virtual Guard (Vguard) is a track-based static mapping translation layer for shingled magnetic recording (SMR) drives.  ...  We compare Vguard with the simulated performance of the Seagate 5 TB drive ("DM-SMR"), using parameters and drive settings shown in Table 1 .  ... 
dblp:conf/hotstorage/ShafaeiD17 fatcat:f2cav64bgnf4ba2jyfmdqotq4a

SMRDB

Rekha Pitchumani, James Hughes, Ethan L. Miller
2015 Proceedings of the 8th ACM International Systems and Storage Conference on - SYSTOR '15  
To address this need, we developed SMRDB, a key-value data store for SMR disks, demonstrating that SMR disks can be effectively used to replace conventional disks for many applications.  ...  Shingled Magnetic Recording (SMR) disks employ a shingled write process that overlaps the data tracks on the disk surface like the shingles on a roof, thereby increasing disk areal density with minimal  ...  SMR access restrictions can be handled in the drive, in the host, or co-operatively by both the host and the drive (Feldman and Gibson 2013) .  ... 
doi:10.1145/2757667.2757680 dblp:conf/systor/PitchumaniHM15 fatcat:ikyoa2isxfaczgaykkt6cvavrm

Elevating commodity storage with the SALSA host translation layer [article]

Nikolas Ioannou, Kornilios Kourtis, Ioannis Koltsidas
2018 arXiv   pre-print
To satisfy increasing storage demands in both capacity and performance, industry has turned to multiple storage technologies, including Flash SSDs and SMR disks.  ...  As a result, performance and durability of many storage devices is severely degraded.  ...  SSDs and SMR drives.  ... 
arXiv:1801.05637v1 fatcat:u5jlqwgk5zaptaz5oxbkaxkahm

THERMAL-HYDRAULIC ANALYSIS OF SMR WITH NATURALLY CIRCULATING PRIMARY SYSTEM DURING LOSS OF FEED WATER ACCIDENT

Susyadi Susyadi
2016 Tri Dasa Mega  
One of SMR designs being developed implements natural driving force for its primary cooling system.  ...  The method used is by representing the reactor system into RELAP5 code generic models and performing numerical simulation.  ...  One of SMR designs being developed implements natural driving force for its primary cooling system.  ... 
doi:10.17146/tdm.2016.18.3.2670 fatcat:ebr3ou6x3rcinbmbgcvxr4dtpy

Spotlight Session on Electrified Aircraft Technology: IMOTHEP (Investigation and Maturation of Technologies for Hybrid Electric Propulsion) Project

Philippe Novelli
2021 Zenodo  
the SMR-radical configuration : Accounting for BLI effect in propulsive performance  Set up of a low fidelity toolchain, based on parallel compressor approach and power balance methods Design of ducted  ...  strategy is key  Indicative preliminary design values 13 Vehicle initial design Radical regional: turboelectric + distributed propulsion • 6 electric engines (300 kW each) • 2 turboshafts driving  ... 
doi:10.5281/zenodo.5243106 fatcat:pxbsafdknzghvonfgbevpw4snq

Remote Monitoring of Equipment in Small Modular Reactors

B. Upadhyaya, C. Mehta, V. Lollar, W. Hines J
2013 Chemical Engineering Transactions  
The control rod drive mechanisms in many SMRs are also internal to the reactor vessel.  ...  A physics model of an integral pressurized water reactor has been developed and used to simulate anomalies in sensors, equipment, and in the reactor dynamics.  ...  Acknowledgments This research is being performed using funding received from the DOE Office of Nuclear Energy's Nuclear Energy University Programs under grant DE-AC07-05IDPS07-07ID14517 with the University  ... 
doi:10.3303/cet1333141 doaj:018b6828d3f9486aa610b77b8a9903f1 fatcat:wmcjri2gzzemvdhibq67lgdqmi
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