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Improving the access time performance of serpentine tape drives

O. Sandsta, R. Midtstraum
1999 Proceedings 15th International Conference on Data Engineering (Cat. No.99CB36337)  
This paper presents a general model for estimating access times of serpentine tape drives. The model is used to schedule I/O requests in order to minimize the total access time.  ...  We propose a new scheduling algorithm, Multi-Pass Scan Star (MPScan*), which makes good utilization of the streaming capability of the tape drive and avoids the pitfalls of naive multi-pass scan algorithms  ...  Characteristics of serpentine tapes Figure 1 shows a principal sketch of a serpentine tape.  ... 
doi:10.1109/icde.1999.754970 dblp:conf/icde/SandstaM99 fatcat:s33cdy6p4zaufdbrn5nswy5xra

Performance Measurements of Tertiary Storage Devices

Theodore Johnson, Ethan L. Miller
1998 Very Large Data Bases Conference  
The database research community has responded with investigations into systems integration, performance modeling, and performance optimization.  ...  In spite of the rapid decrease in magnetic disk prices, tertiary storage (i.e., removable media in a robotic storage library) is becoming increasingly popular.  ...  A fundamental characteristic of a tape drive is the layout of data on the tape.  ... 
dblp:conf/vldb/JohnsonM98 fatcat:do6dirtruvh6na6ql234vjdjie

WARP:Warp Around Data Placement Technique for Serpentine Tapes

Ali Dashti
2001 Mass Storage Systems and Technologies(MSS), Proceedings of the NASA Goddard Conference on  
WARP may reduce the access time by 1 order of magnitude, depending on the tape device specifications and object sizes.  ...  Moreover, we report on the use of WARP with multiple load/unload position tapes (of the future).  ...  Acknowledgments This research was supported in part by the Kuwait University under grant EE 01/00, and NIH grant 1P20MH52194-01A1 (USCBP).  ... 
doi:10.1109/mss.2001.10028 dblp:conf/mss/Dashti01 fatcat:kdyseqkznvetnjkxyezn5uq6je

STUDY FOR POSSIBLE STORAGE SOLUTIONS FOR KLOE

F. DONNO, E. PACE
1996 Computing in High Energy Physics '95  
In this paper we discuss the characteristics of actual tape drive systems and robotic libraries that could be of interest for KLOE (DLT, IBM 359o, STK Redwood, AMPEX DST 310) and results of test are shown  ...  in collaboration with the KLOE DAQ and Off-Line Analysis Groups The requirements of KLOE represent a challenge in this field, since we have to deal with data rates (about 1011 events/year) considerably  ...  We performed a market research to see which of the commercial tape technologies is better suited for KLOE in terms of performance and price.  ... 
doi:10.1142/9789814447188_0045 fatcat:s3l5qjnpdven5ihnpkwi4qmk7y

Simulation of Hierarchical Storage Systems for TCO and QoS [chapter]

Jakob Luettgau, Julian Kunkel
2017 Lecture Notes in Computer Science  
The work shows that the simulations can be used to approximate the behavior of tape systems deployed in the real world and to conduct experiments without requiring a physical tape system.  ...  Different models for the individual components in tape systems are developed. The models are then implemented in a prototype simulation using discrete event simulation.  ...  of Hierarchical Storage Systems for TCO and QoS  ... 
doi:10.1007/978-3-319-67630-2_12 fatcat:kwipwyaf75awtefyhx2k724hlm

Investigation on Data Extraction Trends for Snake Robot

Raisuddin khan, Md. Masum Billah, Nayeem Md. Lutful Huq, Mad Helmi, Syed Masrur Ahmmed
2014 Procedia Computer Science  
Experiment the real snake to extract motion and force data is quite difficult to handle. Thus a new model of the test bed for robot handling and gathering data are proposed in this research.  ...  Angular velocity, snake robot movement trends and motion shape are involved in this investigation by implementation of serpentine locomotion.  ...  Acknowledgment The authors would like to thank MOSTI, Malaysia for their generous funding through science grant.  ... 
doi:10.1016/j.procs.2014.11.045 fatcat:5rtkijbbpngtforrhnvptidzdy

Scheduling and data replication to improve tape jukebox performance

B.K. Hillyer, R. Rastogi, A. Silberschatz
1999 Proceedings 15th International Conference on Data Engineering (Cat. No.99CB36337)  
This paper shows how the performance of tape jukeboxes can be improved across a broad parameter space via a new scheduling algorithm and schemes for the placement and replication of hot data.  ...  As a result, the proposed replication techniques can be used to fill existing spare capacity in a tape jukebox, thus improving the performance of the jukebox "for free".  ...  The authors of [8] propose and evaluate schemes for scheduling random I/Os on a single serpentine tape.  ... 
doi:10.1109/icde.1999.754969 dblp:conf/icde/HillyerRS99 fatcat:56flojscqfes3pjswc4dt73r3u

The Linear Tape File System

David Pease, Arnon Amir, Lucas Villa Real, Brian Biskeborn, Michael Richmond, Atsushi Abe
2010 2010 IEEE 26th Symposium on Mass Storage Systems and Technologies (MSST)  
The Linear Tape File System (LTFS) makes using tape as easy, flexible, portable, and intuitive as using other removable and sharable media, such as a USB drive.  ...  While there are many financial and practical reasons to prefer tape storage over disk for various applications, the difficultly of using tape in a general way is a major inhibitor to its wider usage.  ...  The performance characteristics of a tape are predictable, but they do not necessarily reflect those of a file system running on the tape.  ... 
doi:10.1109/msst.2010.5496989 dblp:conf/mss/PeaseARBRA10 fatcat:hdrobycfbjffxdanwwwagtocpy

DedupT: Deduplication for tape systems

Abdullah Gharaibeh, Cornel Constantinescu, Maohua Lu, Ramani Routray, Anurag Sharma, Prasenjit Sarkar, David Pease, Matei Ripeanu
2014 2014 30th Symposium on Mass Storage Systems and Technologies (MSST)  
This paper (i) details the main challenges to enable efficient deduplication on tape libraries, (ii) presents a class of solutions based on graph-modeling of similarity between data items that enables  ...  efficient placement on tapes; and (iii) presents the design and evaluation of novel cross-tape and on-tape chunk placement algorithms that alleviate tape mount time overhead and reduce on-tape data fragmentation  ...  first chunk and perform a seek to the second one.  ... 
doi:10.1109/msst.2014.6855555 dblp:conf/mss/GharaibehCLRSSPR14 fatcat:lbvxcmecgbfpfllu6r3ssi5bbq

An I/O scheduler for dual-partitioned tapes

Lucas C. Villa Real, Michael Richmond, Brian Biskeborn, David Pease
2015 2015 IEEE International Conference on Networking, Architecture and Storage (NAS)  
We observe the effectiveness of delayed writes on decreased file fragmentation and the reduction of partition switches with the use of buffering and of redundant file copies.  ...  Nowadays, after the introduction of the LTO 5 standard, tapes support logical partitioning and, with the arrival of the Linear Tape File System (LTFS), their contents are exposed through the file system  ...  A sequential write operation is performed in a serpentine pattern that follows the directions of the wraps.  ... 
doi:10.1109/nas.2015.7255232 dblp:conf/nas/RealRBP15 fatcat:7msyrc2hfben5ficykg45rw3hm

Modular and deformable touch-sensitive surfaces based on time domain reflectometry

Raphael Wimmer, Patrick Baudisch
2011 Proceedings of the 24th annual ACM symposium on User interface software and technology - UIST '11  
We illustrate these enhancements with 13 prototypes and a series of performance measurements. (3) Deformability: We create deformable touch devices by mounting stretchable wire patterns onto elastic tape  ...  To accomplish this, we extend time domain reflectometry in three ways: (1) Thin: We demonstrate how to run time domain reflectometry on a single wire.  ...  earlier versions of this paper.  ... 
doi:10.1145/2047196.2047264 dblp:conf/uist/WimmerB11 fatcat:62mlo6mggbhufhj6jibsxfsx2e

An Exact Algorithm for the Linear Tape Scheduling Problem [article]

Valentin Honoré
2022 arXiv   pre-print
Their main interests are a large capacity and a low price per gigabyte, which come at the cost of a much larger file access time than on disks.  ...  Therefore, in this paper, we aim at improving the quality of service experienced by users of tape storage systems, and not only the peak performance of such systems.  ...  Experiments presented in this paper were carried out using the Grid'5000 testbed, supported by a scientific interest group hosted by Inria and including CNRS, RENATER and several Universities as well as  ... 
arXiv:2112.09384v3 fatcat:oap6zo2tgzd3te2usxnugsecva

Control Methods in Data-Storage Systems

Giovanni Cherubini, Chung Choo Chung, William C. Messner, S. O. Reza Moheimani
2012 IEEE Transactions on Control Systems Technology  
The recording performance of data-storage devices, in which write/read elements move relative to a storage medium to reliably store and retrieve information, depends on the capability of servo mechanisms  ...  The desired characteristics of servo mechanisms for datastorage systems include robustness against variations of environmental parameters, high resolution, accuracy, stability, and fast response.  ...  A model of the readback servo signal to analyze the impact of the various TBS elements on the overall servo performance has been developed in [35] and [36] .  ... 
doi:10.1109/tcst.2011.2176942 fatcat:e6kbabrwwbghhebyb2kidgncrm

Three-dimensional flow measurements induced from serpentine plasma actuators in quiescent air

R J Durscher, S Roy
2012 Journal of Physics D: Applied Physics  
Such a configuration induces a local pinching and a local spreading of the fluid as one follows along the span of the actuator.  ...  This paper presents three-dimensional flow measurements performed on a dielectric barrier discharge (DBD) actuator with the electrodes in a serpentine design.  ...  The first author is also supported by a DOD SMART scholarship.  ... 
doi:10.1088/0022-3727/45/3/035202 fatcat:74rh5uxfm5dqpebry5lbothdqe

A simulated annealing approach for multimedia data placement

Evimaria Terzi, Athena Vakali, Lefteris Angelis
2004 Journal of Systems and Software  
Performance of the placement policies is experimentally evaluated on a simulated tertiary storage subsystem.  ...  a lot on the initial configuration and the neighborhood search.  ...  Acknowledgements The authors thank the referees who have contributed in the improvement of the paper's quality, organization and readability.  ... 
doi:10.1016/j.jss.2003.09.020 fatcat:3ddkqf4egbcjjnp5dzndvnpykm
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