Conversational-Tape-Transformation
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Improving Tape Restore Request Scheduling in the Storage System
Department of Computer Science Bachelor Thesis Improving Tape Restore Request Scheduling in the Storage System dCache Evaluation of Pre-Scheduling Strategies by Disk Systems in Front of Automated Tape Storage in the Context of the ATLAS Experiment Handed in on: February 24, 2020 Author: Lea Morschel Deutsches Elektronen-Synchrotron DESY Notkestraße 85 D-22607 Hamburg Supervisor (University): Supervisor (Company): Prof. Dr. Dennis S¨aring Tigran Mkrtchyan University of Applied Sciences Wedel Deutsches Elektronen-Synchrotron DESY Feldstraße 143 Notkestraße 85 D-22880 Wedel D-22607 Hamburg Abstract This thesis aims to improve the data recall efficiency from magnetic tape to disk by optimizing the request scheduling within the scientific disk storage system dCache. It is written in the context of the future data management challenges by the ATLAS experiment, where the high luminosity configuration will require an order of magnitude more storage capacity than can be provided by the current funding and usage model. A concept called data carousel is being investigated by the ATLAS collaboration, which aims to realize the active yet efficient usage of tape storage. Established components in the data management chain such as dCache are aimed to be adapted to efficiently support this altered workflow. In the context of this thesis, the current request scheduling within dCache is evaluated, the problem formalized and analyzed with regard to finding an optimal solution. A solution is proposed and discussed. Due to the complexity of the system chain and resulting behavior, which is not easily subjected to experimentation, a tape system simulator is developed, dCache modeled as a requestor thereof. -
Naprave Za Masovno Shranjevanje Podatkov
TŠC Kranj Naprave za masovno shranjevanje podatkov 08 December 20, 2008 [NAPRAVE ZA MASOVNO SHRANJEVANJE PODATKOV] Kazalo Uvod:...............................................................................................................................................................................3 Magnetni trak..................................................................................................................................................................3 IBM formati:................................................................................................................................................................4 Kronološki seznam magnetnih formatov:....................................................................................................................4 Disketa:............................................................................................................................................................................5 Cd:..................................................................................................................................................................................6 DVD:................................................................................................................................................................................6 Oznake regij so naslednje:...........................................................................................................................................7 Trdi disk...........................................................................................................................................................................8 -
Copias De Seguridad : Estudio Y Metodología
Trabajo Final de Carrera Copias de seguridad: Estudio y metodologı́a. Memoria Autor: Rafael Santamaría Carmona Consultor: Juan José Cuadrado Gallego 1 CONTENIDO 1 INTRODUCCIÓN 9 1.1 OBJETIVOS 11 1.2 METODOLOGÍA 12 2 LAS COPIAS DE SEGURIDAD A LO LARGO DE LA HISTORIA 13 2.1 TARJETAS PERFORADAS 14 2.2 CINTAS MAGNÉTICAS 20 2.3 DISCOS DUROS 22 2.3.1 LOS DISCOS DUROS EN EL SENO DE HOGARES Y PEQUEÑAS O MEDIANAS EMPRESAS 23 2.4 DISCOS FLEXIBLES 25 2.5 DISPOSITIVOS ÓPTICOS 26 2.6 MEMORIAS FLASH USB (USB FLASH DRIVES ) 28 2.7 INTERNET Y “LA NUBE ” 30 3 DISPOSITIVOS DE ALMACENAMIENTO 33 3.1 CINTAS MAGNÉTICAS 33 3.1.1 INTRODUCCIÓN 33 3.1.2 ESTRUCTURA FÍSICA 33 3.1.3 ESTRUCTURA LÓGICA 34 3.1.4 MÉTODOS DE GRABACIÓN DIGITAL 35 3.1.4.1 Grabación lineal 35 3.1.4.2 Grabación transversal 36 3.1.5 FORMATOS DE CINTAS MAGNÉTICAS 38 3.2 DISCOS DUROS 41 3.2.1 INTRODUCCIÓN 41 3.2.2 ESTRUCTURA FÍSICA 41 3.2.3 ESTRUCTURA LÓGICA 44 3.2.4 FUNCIONAMIENTO BÁSICO 45 3.2.5 TIPOS DE DISCOS DUROS 46 3.2.5.1 Discos duros externos portátiles 46 3.2.5.2 Discos duros externos de sobremesa 46 3.2.5.3 Mini discos duros externos 47 3.3 DISCOS ÓPTICOS 48 3.3.1 INTRODUCCIÓN 48 3.3.2 ESTRUCTURA 48 3.3.3 PROCESO DE LECTURA 49 3.3.4 PROCESO DE GRABACIÓN 49 3.4 DISPOSITIVOS DE MEMORIA FLASH 50 COPIAS DE SEGURIDAD : ESTUDIO Y METODOLOGÍA 3.4.1 INTRODUCCIÓN 50 3.4.2 ESTRUCTURA 50 3.4.3 MÉTODO DE GRABACIÓN 51 4 LAS COPIAS DE SEGURIDAD Y EL ESTÁNDAR ISO 53 4.1 INTRODUCCIÓN 53 4.2 EL ESTÁNDAR ISO/IEC 27002 55 5 MODELOS DE COPIAS DE SEGURIDAD 59 5.1 INTRODUCCIÓN 59 5.2 COPIA TOTAL O COMPLETA -
Oral History of Grant Saviers; 2011-05-17
Oral History of Grant Saviers Interviewed by: Tom Gardner Recorded: May 17, 2011 Mountain View, California CHM Reference number: X6162.2011 © 2011 Computer History Museum Oral History of Grant Saviers [0:00:00]1 Gardner: I'm Tom Gardner, a volunteer with the Storage Special Interest Group at the Computer History Museum, and this morning I'm here with Grant Saviers, to mainly cover Grant's remarkable history at Digital Equipment Corporation. Probably a good time for the prisoner shot. Saviers: Right, an original sign from DEC, when it was a 6,000 square foot operation at Building 12 of the Mill [DEC Maynard MA facility]. Of course, once you’ve been at DEC, you're always a DEC-ie, so I saved this when I left. Gardner: Grant has a long career in the computer industry, long time at DEC, and then with Adaptec. We'll probably not get to Adaptec in this recording session, we'll leave that for later, and we probably will not cover all of Grant's career, focusing today mainly on the storage aspects of Grant's career. Grant, tell us about your early background, where you grew up. Saviers: Well, I was born in Baltimore, Maryland, and my dad was learning to run a machine gun, so he could go off to Europe and fight in World War II, and I grew up as the only child in a family which was not a technical family, my dad was an accountant, my mother was a housewife, and at some early age, I got interested in technology, you know, the kids' chemistry set, how to blow up things, and things like that, and I got into electronics via ham radio, and that was when I was 13 years old. -
Sds16 Muras Lto-Report.Pdf
Tape Storage – an introduction Popular perception of tape storage is that of an old and obsolete technology. It is the oldest storage technology still in use today. There are some benefits to tape storage in comparison to hard disk based storage that give reason to the continued development of the technology. Some of those are for example: • No power needed to preserve data (HDDs are similar in this regard but are rarely used as offline media due to portability reasons) • Data density (more data can be fit within the same volume) • Portability (tape cartridges can be easily transported – e.g. to secure locations geographically apart from the backed‐up data center) • Cost per stored Byte is lower Source: http://www.economist.com/blogs/babbage/2013/09/information‐storage Image [1]: http://cdn.static‐economist.com/sites/default/files/imagecache/full‐ width/images/2013/09/blogs/babbage/20130928_stp504.jpg Hierarchical Storage Management Tape storage is located at the bottom of the hierarchical storage model. Storage is always a trade‐off between cost, capacity, durability and performance. The decision which technology to use is based on weighing those factors against each other. Small, expensive, volatile and very fast memories like CPU registers and caches which range up to a couple of Mbytes on one side of the spectrum versus relatively cheap, and comparatively slow non‐volatile HDDs and tape‐based storage on the other side. Source: https://en.wikipedia.org/wiki/Hierarchical_storage_management Image [2]: https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/ComputerMemoryHierarchy.svg/20 00px‐ComputerMemoryHierarchy.svg.png Tape Storage – early history Previously used punched cards proved to be too unreliable for data storage and offered a very low data density.