Datacenter Memory and Storage Past, Present, and Future
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Hard Disk Drives
37 Hard Disk Drives The last chapter introduced the general concept of an I/O device and showed you how the OS might interact with such a beast. In this chapter, we dive into more detail about one device in particular: the hard disk drive. These drives have been the main form of persistent data storage in computer systems for decades and much of the development of file sys- tem technology (coming soon) is predicated on their behavior. Thus, it is worth understanding the details of a disk’s operation before building the file system software that manages it. Many of these details are avail- able in excellent papers by Ruemmler and Wilkes [RW92] and Anderson, Dykes, and Riedel [ADR03]. CRUX: HOW TO STORE AND ACCESS DATA ON DISK How do modern hard-disk drives store data? What is the interface? How is the data actually laid out and accessed? How does disk schedul- ing improve performance? 37.1 The Interface Let’s start by understanding the interface to a modern disk drive. The basic interface for all modern drives is straightforward. The drive consists of a large number of sectors (512-byte blocks), each of which can be read or written. The sectors are numbered from 0 to n − 1 on a disk with n sectors. Thus, we can view the disk as an array of sectors; 0 to n − 1 is thus the address space of the drive. Multi-sector operations are possible; indeed, many file systems will read or write 4KB at a time (or more). However, when updating the disk, the only guarantee drive manufacturers make is that a single 512-byte write is atomic (i.e., it will either complete in its entirety or it won’t com- plete at all); thus, if an untimely power loss occurs, only a portion of a larger write may complete (sometimes called a torn write). -
Lecture Note 1
EE586 VLSI Design Partha Pande School of EECS Washington State University [email protected] Lecture 1 (Introduction) Why is designing digital ICs different today than it was before? Will it change in future? The First Computer The Babbage Difference Engine (1832) 25,000 parts cost: £17,470 ENIAC - The first electronic computer (1946) The Transistor Revolution First transistor Bell Labs, 1948 The First Integrated Circuits Bipolar logic 1960’s ECL 3-input Gate Motorola 1966 Intel 4004 Micro-Processor 1971 1000 transistors 1 MHz operation Intel Pentium (IV) microprocessor Moore’s Law In 1965, Gordon Moore noted that the number of transistors on a chip doubled every 18 to 24 months. He made a prediction that semiconductor technology will double its effectiveness every 18 months Moore’s Law 16 15 14 13 12 11 10 9 8 7 6 OF THE NUMBER OF 2 5 4 LOG 3 2 1 COMPONENTS PER INTEGRATED FUNCTION 0 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 Electronics, April 19, 1965. Evolution in Complexity Transistor Counts 1 Billion K Transistors 1,000,000 100,000 Pentium® III 10,000 Pentium® II Pentium® Pro 1,000 Pentium® i486 100 i386 80286 10 8086 Source: Intel 1 1975 1980 1985 1990 1995 2000 2005 2010 Projected Courtesy, Intel Moore’s law in Microprocessors 1000 2X growth in 1.96 years! 100 10 P6 Pentium® proc 1 486 386 0.1 286 Transistors (MT) Transistors 8086 Transistors8085 on Lead Microprocessors double every 2 years 0.01 8080 8008 4004 0.001 1970 1980 1990 2000 2010 Year Courtesy, Intel Die Size Growth 100 P6 -
Episodic Memory in Transient Global Amnesia: Encoding, Storage, Or Retrieval Deficit?
J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.66.2.148 on 1 February 1999. Downloaded from 148 J Neurol Neurosurg Psychiatry 1999;66:148–154 Episodic memory in transient global amnesia: encoding, storage, or retrieval deficit? Francis Eustache, Béatrice Desgranges, Peggy Laville, Bérengère Guillery, Catherine Lalevée, Stéphane SchaeVer, Vincent de la Sayette, Serge Iglesias, Jean-Claude Baron, Fausto Viader Abstract evertheless this division into processing stages Objectives—To assess episodic memory continues to be useful in helping understand (especially anterograde amnesia) during the working of memory systems”. These three the acute phase of transient global amne- stages may be defined in the following way: (1) sia to diVerentiate an encoding, a storage, encoding, during which perceptive information or a retrieval deficit. is transformed into more or less stable mental Methods—In three patients, whose am- representations; (2) storage (or consolidation), nestic episode fulfilled all current criteria during which mnemonic information is associ- for transient global amnesia, a neuro- ated with other representations and maintained psychological protocol was administered in long term memory; (3) retrieval, during which included a word learning task which the subject can momentarily reactivate derived from the Grober and Buschke’s mnemonic representations. These definitions procedure. will be used in the present study. Results—In one patient, the results sug- Regarding the retrograde amnesia of TGA, it gested an encoding deficit, -
Mnemonics in a Mnutshell: 32 Aids to Psychiatric Diagnosis
Mnemonics in a mnutshell: 32 aids to psychiatric diagnosis Clever, irreverent, or amusing, a mnemonic you remember is a lifelong learning tool ® Dowden Health Media rom SIG: E CAPS to CAGE and WWHHHHIMPS, mnemonics help practitioners and trainees recall Fimportant lists (suchCopyright as criteriaFor for depression,personal use only screening questions for alcoholism, or life-threatening causes of delirium, respectively). Mnemonics’ effi cacy rests on the principle that grouped information is easi- er to remember than individual points of data. Not everyone loves mnemonics, but recollecting diagnostic criteria is useful in clinical practice and research, on board examinations, and for insurance reimbursement. Thus, tools that assist in recalling di- agnostic criteria have a role in psychiatric practice and IMAGES teaching. JUPITER In this article, we present 32 mnemonics to help cli- © nicians diagnose: • affective disorders (Box 1, page 28)1,2 Jason P. Caplan, MD Assistant clinical professor of psychiatry • anxiety disorders (Box 2, page 29)3-6 Creighton University School of Medicine 7,8 • medication adverse effects (Box 3, page 29) Omaha, NE • personality disorders (Box 4, page 30)9-11 Chief of psychiatry • addiction disorders (Box 5, page 32)12,13 St. Joseph’s Hospital and Medical Center Phoenix, AZ • causes of delirium (Box 6, page 32).14 We also discuss how mnemonics improve one’s Theodore A. Stern, MD Professor of psychiatry memory, based on the principles of learning theory. Harvard Medical School Chief, psychiatric consultation service Massachusetts General Hospital How mnemonics work Boston, MA A mnemonic—from the Greek word “mnemonikos” (“of memory”)—links new data with previously learned information. -
Cloud Transformation/ Operation Services & Xaas
Cloud Transformation/ A research report Operation Services & XaaS comparing provider strengths, challenges Global 2019 and competitive differentiators Quadrant Report Customized report courtesy of: November 2018 ISG Provider Lens™ Quadrant Report | November 2018 Section Name About this Report Information Services Group, Inc. is solely responsible for the content of this report. ISG Provider Lens™ delivers leading-edge and actionable research studies, reports and consulting services focused on technology and service providers’ strength and Unless otherwise cited, all content, including illustrations, research, conclusions, weaknesses and how they are positioned relative to their peers in the market. These assertions and positions contained in this report were developed by and are the sole reports provide influential insights accessed by our large pool of advisors who are property of Information Services Group, Inc. actively advising outsourcing deals as well as large numbers of ISG enterprise clients who are potential outsourcers. The research and analysis presented in this report includes research from the ISG Provider Lens™ program, ongoing ISG Research programs, interviews with ISG advisors, For more information about our studies, please email [email protected], briefings with services providers and analysis of publicly available market information call +49 (0) 561-50697537, or visit ISG Provider Lens™ under ISG Provider Lens™. from multiple sources. The data collected for this report represents information that ISG believes to be current as of September 2018, for providers who actively participated as well as for providers who did not. ISG recognizes that many mergers and acquisitions have taken place since that time but those changes are not reflected in this report. -
Memory Reconsolidation
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Elsevier - Publisher Connector Current Biology Vol 23 No 17 R746 emerged from the pattern of amnesia consequence of this dynamic process Memory collectively caused by all these is that established memories, which reconsolidation different types of interventions. have reached a level of stability, can be Memory consolidation appeared to bidirectionally modulated and modified: be a complex and quite prolonged they can be weakened, disrupted Cristina M. Alberini1 process, during which different types or enhanced, and be associated and Joseph E. LeDoux1,2 of amnestic manipulation were shown to parallel memory traces. These to disrupt different mechanisms in the possibilities for trace strengthening The formation, storage and use of series of changes occurring throughout or weakening, and also for qualitative memories is critical for normal adaptive the consolidation process. The initial modifications via retrieval and functioning, including the execution phase of consolidation is known to reconsolidation, have important of goal-directed behavior, thinking, require a number of regulated steps behavioral and clinical implications. problem solving and decision-making, of post-translational, translational and They offer opportunities for finding and is at the center of a variety of gene expression mechanisms, and strategies that could change learning cognitive, addictive, mood, anxiety, blockade of any of these can impede and memory to make it more efficient and developmental disorders. Memory the entire consolidation process. and adaptive, to prevent or rescue also significantly contributes to the A century of studies on memory memory impairments, and to help shaping of human personality and consolidation proposed that, despite treat diseases linked to abnormally character, and to social interactions. -
The Birth, Evolution and Future of Microprocessor
The Birth, Evolution and Future of Microprocessor Swetha Kogatam Computer Science Department San Jose State University San Jose, CA 95192 408-924-1000 [email protected] ABSTRACT timed sequence through the bus system to output devices such as The world's first microprocessor, the 4004, was co-developed by CRT Screens, networks, or printers. In some cases, the terms Busicom, a Japanese manufacturer of calculators, and Intel, a U.S. 'CPU' and 'microprocessor' are used interchangeably to denote the manufacturer of semiconductors. The basic architecture of 4004 same device. was developed in August 1969; a concrete plan for the 4004 The different ways in which microprocessors are categorized are: system was finalized in December 1969; and the first microprocessor was successfully developed in March 1971. a) CISC (Complex Instruction Set Computers) Microprocessors, which became the "technology to open up a new b) RISC (Reduced Instruction Set Computers) era," brought two outstanding impacts, "power of intelligence" and "power of computing". First, microprocessors opened up a new a) VLIW(Very Long Instruction Word Computers) "era of programming" through replacing with software, the b) Super scalar processors hardwired logic based on IC's of the former "era of logic". At the same time, microprocessors allowed young engineers access to "power of computing" for the creative development of personal 2. BIRTH OF THE MICROPROCESSOR computers and computer games, which in turn led to growth in the In 1970, Intel introduced the first dynamic RAM, which increased software industry, and paved the way to the development of high- IC memory by a factor of four. -
Nasdeluxe Z-Series
NASdeluxe Z-Series Benefit from scalable ZFS data storage By partnering with Starline and with Starline Computer’s NASdeluxe Open-E, you receive highly efficient Z-series and Open-E JovianDSS. This and reliable storage solutions that software-defined storage solution is offer: Enhanced Storage Performance well-suited for a wide range of applica- tions. It caters perfectly to the needs • Great adaptability Tiered RAM and SSD cache of enterprises that are looking to de- • Tiered and all-flash storage Data integrity check ploy a flexible storage configuration systems which can be expanded to a high avail- Data compression and in-line • High IOPS through RAM and SSD ability cluster. Starline and Open-E can data deduplication caching look back on a strategic partnership of Thin provisioning and unlimited • Superb expandability with more than 10 years. As the first part- number of snapshots and clones ner with a Gold partnership level, Star- Starline’s high-density JBODs – line has always been working hand in without downtime Simplified management hand with Open-E to develop and de- Flexible scalability liver innovative data storage solutions. Starline’s NASdeluxe Z-Series offers In fact, Starline supports worldwide not only great features, but also great Hardware independence enterprises in managing and pro- flexibility – thanks to its modular archi- tecting their storage, with over 2,800 tecture. Open-E installations to date. www.starline.de Z-Series But even with a standard configuration with nearline HDDs IOPS and SSDs for caching, you will be able to achieve high IOPS 250 000 at a reasonable cost. -
Use External Storage Devices Like Pen Drives, Cds, and Dvds
External Intel® Learn Easy Steps Activity Card Storage Devices Using external storage devices like Pen Drives, CDs, and DVDs loading Videos Since the advent of computers, there has been a need to transfer data between devices and/or store them permanently. You may want to look at a file that you have created or an image that you have taken today one year later. For this it has to be stored somewhere securely. Similarly, you may want to give a document you have created or a digital picture you have taken to someone you know. There are many ways of doing this – online and offline. While online data transfer or storage requires the use of Internet, offline storage can be managed with minimum resources. The only requirement in this case would be a storage device. Earlier data storage devices used to mainly be Floppy drives which had a small storage space. However, with the development of computer technology, we today have pen drives, CD/DVD devices and other removable media to store and transfer data. With these, you store/save/copy files and folders containing data, pictures, videos, audio, etc. from your computer and even transfer them to another computer. They are called secondary storage devices. To access the data stored in these devices, you have to attach them to a computer and access the stored data. Some of the examples of external storage devices are- Pen drives, CDs, and DVDs. Introduction to Pen Drive/CD/DVD A pen drive is a small self-powered drive that connects to a computer directly through a USB port. -
Nanotechnology Trends in Nonvolatile Memory Devices
IBM Research Nanotechnology Trends in Nonvolatile Memory Devices Gian-Luca Bona [email protected] IBM Research, Almaden Research Center © 2008 IBM Corporation IBM Research The Elusive Universal Memory © 2008 IBM Corporation IBM Research Incumbent Semiconductor Memories SRAM Cost NOR FLASH DRAM NAND FLASH Attributes for universal memories: –Highest performance –Lowest active and standby power –Unlimited Read/Write endurance –Non-Volatility –Compatible to existing technologies –Continuously scalable –Lowest cost per bit Performance © 2008 IBM Corporation IBM Research Incumbent Semiconductor Memories SRAM Cost NOR FLASH DRAM NAND FLASH m+1 SLm SLm-1 WLn-1 WLn WLn+1 A new class of universal storage device : – a fast solid-state, nonvolatile RAM – enables compact, robust storage systems with solid state reliability and significantly improved cost- performance Performance © 2008 IBM Corporation IBM Research Non-volatile, universal semiconductor memory SL m+1 SL m SL m-1 WL n-1 WL n WL n+1 Everyone is looking for a dense (cheap) crosspoint memory. It is relatively easy to identify materials that show bistable hysteretic behavior (easily distinguishable, stable on/off states). IBM © 2006 IBM Corporation IBM Research The Memory Landscape © 2008 IBM Corporation IBM Research IBM Research Histogram of Memory Papers Papers presented at Symposium on VLSI Technology and IEDM; Ref.: G. Burr et al., IBM Journal of R&D, Vol.52, No.4/5, July 2008 © 2008 IBM Corporation IBM Research IBM Research Emerging Memory Technologies Memory technology remains an -
Cloud Transformation/ Operation Services & Xaas
Cloud Transformation/ A research report Operation Services & XaaS comparing provider strengths, challenges U.S. 2019 and competitive differentiators Quadrant Report Customized report courtesy of: November 2018 ISG Provider Lens™ Quadrant Report | November 2018 Section Name About this Report Information Services Group, Inc. is solely responsible for the content of this report. ISG Provider Lens™ delivers leading-edge and actionable research studies, reports and consulting services focused on technology and service providers’ strength and Unless otherwise cited, all content, including illustrations, research, conclusions, weaknesses and how they are positioned relative to their peers in the market. These assertions and positions contained in this report were developed by and are the sole reports provide influential insights accessed by our large pool of advisors who are property of Information Services Group, Inc. actively advising outsourcing deals as well as large numbers of ISG enterprise clients who are potential outsourcers. The research and analysis presented in this report includes research from the ISG Provider Lens™ program, ongoing ISG Research programs, interviews with ISG advisors, For more information about our studies, please email [email protected], briefings with services providers and analysis of publicly available market information call +49 (0) 561-50697537, or visit ISG Provider Lens™ under ISG Provider Lens™. from multiple sources. The data collected for this report represents information that ISG believes to be current as of September 2018, for providers who actively participated as well as for providers who did not. ISG recognizes that many mergers and acquisitions have taken place since that time but those changes are not reflected in this report. -
Onvey White Paper C
C onvey White Paper onvey Ramping Up Web Server Memcached Capabilities with Hybrid-Core Computing Convey Computer White Paper Convey White Paper Ramping Up Web Server Memcached Capabilities with Hybrid-Core Computing Introduction Constantly increasing network traffic and rapidly growing datasets present ever increasing scaling challenges for memcached, a high-performance, distributed memory caching system used by most of the top web sites in the world. Convey’s hybrid-core technology provides a solution. The rapid growth of the Internet, and the emergence of hyperscale computing are placing new demands on the flow of web traffic. For example, companies like Amazon, Google, and Facebook have created hyperscale data centers to handle exponentially increasing traffic driven by social networking and on-line commerce. The problem of delivering content to consumers in a real-time manner is compounded by this explosive growth. Contents Enter Memcached 1 Introduction Memcached is a key technology employed to accelerate the delivery of content that 1 Enter Memcached resides/persists in mass storage systems. 2 Rejuvenation Time Memcached, which stands for Memory Cache Daemon, is a general-purpose distributed 2 More is Less memory caching system. It was developed in 2003 because LiveJournal, an early social 3 The Hybrid-Core Computing blogging site, was experiencing rapid growth and its users were complaining about slow Solution response times. 4 Removing the Scalability Barrier 4 Summary of Benefits One of the major bottlenecks was the latency associated with reading from the 5 Conclusions database. To deal with this problem, the journal’s founder, Brad Fitzgerald, created memcached. It was a smashing success, eliminating the bottleneck to the delight of LiveJournal users.