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Intelligent Edge
Published in Haishi Bai, Zen of Cloud, 2019
Warm storage. For storage on disk, Solid State Drives (SSDs) can be used to provide better performance over traditional Hard Disk Drives (HDDs). SSDs don't have any mechanical parts, so they can seek disk addresses much more efficiently than HDDs that use mechanical actuators over rotating disks. Most databases are backed by hard drives. Data stored in warm storage is used for batched analysis such as aggregations, cross-references, and trend analysis.
Reliability assessment for solid state drive based on measurement errors and fuzzy failure threshold
Published in Stein Haugen, Anne Barros, Coen van Gulijk, Trond Kongsvik, Jan Erik Vinnem, Safety and Reliability – Safe Societies in a Changing World, 2018
Peng Li, Jiaxin Yuan, Wei Dang
Solid state drives (SSDs) are the most important and widely-used data storage device in space application due to their high performance, low energy consumption, small size, and shock resistance compared with traditional hard disk drives (HDDs). As the amount of data stored in SSDs keeps increasing, it is important to understand the reliability characteristics of SSD under field conditions. However, for SSD with high reliability and long life, it is nearly impossible to obtain sufficient amount of time-to-failure data within acceptable testing time by testing such products under normal operating environments and sometimes even under harsher conditions (Nelson 2008).
Networked Media in an IT Environment
Published in Al Kovalick, Video Systems in an IT Environment, 2013
At 3 o’clock on Figure 1.4 is the dimension of storage density (cost/GB), storage bandwidth3 [cost/(Mbps)], and power consumed (W/GB). For all metrics, smaller is better. Unless you have been living in a cave for the past 20 years, it is obvious that disk drive capacity per unit has been climbing at an astronomical rate. Much of the technology that makes up drives and other storage media also follows Moore’s law, hence the capacity increase. The dimension of storage is a broad topic. The four main storage means are hard disk drives (HDD), optical disk, tape, and DRAM/Flash. The application spaces for these are as follows: HDD—video servers, file/database servers, Web servers, PCs of all types, personal video recorders, embedded products (portable music players)Optical disk—DVD (4.7 GB single sided), CD (700 MB), Blu-ray (up to 25 GB single sided, 50 GB double sided), and other lesser known devices. Some sample applications are Consumer DVD—SD and HDSony XDCAM HD using a variation of the Blu-ray format for field acquisition at 50 GB per discArchive, backupTape—traditional videotape, archive, backup. Archive tape technology is discussed in Chapter 3A.RAM/Flash—RAM is being used to replace disc and tape for select applications, including deep cache. The Panasonic P2 camera is a good example of a professional camera that has only removable Flash cards as the media store. In 2009, 32 GB modules are common and able to store 160 minutes of DV25 video. P2 cards have writing speeds of 640 Mbps, exceeding conventional Flash memory. Sony also offers a Flash-based camera, the XDCAM EX, using the SxS PRO cards. By 2010, 128 GB Flash cards will be in use.SSD—The Solid State Disc is a device that mimics an HDD using identical I/O ports and form factor but with Flash memory replacing rotating platters for storage. There are numerous reasons to replace HDD with SSD in some applications. See Appendix L for a review of the pros and cons.
Anomaly Detection Model for Predicting Hard Disk Drive Failures
Published in Applied Artificial Intelligence, 2021
Sladjana M. Djurasevic, Uros M. Pesovic, Borislav S. Djordjevic
HDDs have been primary technology for computer data storage for several decades. Newly emerging SSDs (Solid State Drives), based on semiconductor storage, surpass HDDs in terms of response time and throughput performance. On the other hand, HDDs are dozen times cheaper per stored byte than SSDs (Appuswamy et al. 2017), and it is still the predominant data storage medium both in the enterprise and consumer market. The electromechanical design of the HDD renders it more susceptible to failures than other components of the computer system, with an average annual failure rate of HDDs in the range from 0.3 to 3%. The HDD failure generally leads to permanent data loss and typically the cost of losing data exceeds that of HDD itself. Reliability of data storage on HDD is significantly improved using RAID (Redundant Array of Independent Disks) technology which provides data retention in case one or more HDDs in RAID array had failed. RAID technology is commonly used in enterprise computer systems given its considerable cost and multiple-HDD requirement in forming a redundant array. Typical computer systems for consumer market utilize a single HDD. The prediction of HDD failure can be very useful in preventing data loss as it allows for data backup in case of imminent HDD failure warning.
iSDS: a self-configurable software-defined storage system for enterprise
Published in Enterprise Information Systems, 2018
Wen-Shyen Eric Chen, Chun-Fang Huang, Ming-Jen Huang
To help enterprises lower their spending on storage, there are also many new technologies emerging in recent years. For example, higher density hard disc drives (HDDs) brought much cheaper but larger size for magnetic media. Another example is the emergence of solid-state drives (SSDs) (Streetman and Banerjee 2000, Agrawal et al. 2008). SSD is a data storage media that uses integrated circuit (similar to random-access memory [RAM]) to store data. Different from RAM, the data stored in SSD are permanent even when power is off. Without the rotation of magnetic discs and forward–backward movement of reading head, SSD is much faster than HDD. However, its price per unit is still much higher than HDD (Newman 2014).