Computer Science
Solid State Storage
Solid state storage refers to a type of computer storage that uses solid state drives (SSDs) to store data. Unlike traditional hard disk drives (HDDs), solid state storage has no moving parts, which results in faster data access and improved reliability. It is commonly used in modern computing devices such as laptops, desktops, and servers due to its speed and durability.
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4 Key excerpts on "Solid State Storage"
eBook - ePubMoving Media Storage Technologies
Applications & Workflows for Video and Media Server Platforms
- Karl Paulsen(Author)
- 2012(Publication Date)
- Routledge(Publisher)
ca . 2008–2009), and the storage size of memory modules began to grow, the implementation of SSD systems began to increase.SSD may stand for either solid state disk or solid state drive. Purists would argue that it cannot be a disk because that would assume it has a form of “disk” media that spins. Perhaps, it is assumed that because SSD is evaluated in competitive terms against the HDD, and depending upon the system, may use the same SAS, SATA, or Fibre Channel storage interfaces, that the SSD really is not just a disk—more appropriately it is a drive.Regardless, this chapter will look at the SSD as a formidable type of storage, one that offers many advantages to magnetic or optical spinning disk storage systems, not the least of which is power consumption, reduction of access time, and resistance to shock.Irrespective of SSD’s advantages and capabilities, which are covered in this chapter, a looming question still remains: As the storage industry takes a hard look at cost-control and its environmental ecosystems, just how soon will the move to SSD accelerate for enterprise level implementations?KEY CHAPTER POINTS• An overview, history, and development of flash memory, which is the media form utilized in solid state disks• The components, cell structure, and operations of flash memory• Outlining the values and the limitations of flash memory• The designations, applications, and differences between NOR and NAND memories• How data protection and security are handled in solid state disks• Applications for flash memory and the components in a solid state diskSolid State Storage Evolution
In an era of increasing file sizes, megalith-like storage requirements, rotational disk drive capacities exceeding terabyte proportions, and an astounding dependence upon storage in dimensions previously unobtainable comes a restoration of a nearly lost technology—solid state memory for mass storage.
eBook - PDFPhase Change Memory
From Devices to Systems
- Naveen Muralimanohar, Moinuddin K. Qureshi, Sudhanva Gurumurthi, Bipin Rajendran(Authors)
- 2022(Publication Date)
- Springer(Publisher)
The advent of Solid-State Disks (SSDs) has played an important role towards realizing such high-performance, energy-efficient storage systems. 7.3.1 OVERVIEW OF SOLID-STATE DISKS An SSD is a device that uses a Non-Volatile Memory as the storage medium. Current SSDs use NAND Flash as the NVM. Unlike a Hard Disk Drive (HDD), which is an electro-mechanical device with a rotating spindle and moving arms, an SSD has no moving parts. As a result, an SSD 7.3. STORAGE SYSTEM DESIGN 81 typically dissipates much less power and heat than an HDD, makes no acoustic noise, and is tolerant to shock and vibrations. SSDs also use traditional storage interfaces, such as SCSI and SATA, and can therefore be used as drop-in replacements for HDDs. Host Interface Controller Processor Buffers Flash Chip Flash Chip Flash Chip Flash Chip Flash Chip Flash Chip RAM Figure 7.1: Solid-State Disk Architecture. Image Adapted from [4]. The overall architecture of an SSD is given in Figure 7.1. The SSD consists of several Flash memory chips that are connected to a controller. An enterprise SSD may contain more than one controller. The SSD also contains DRAM memory that is used a cache and the storage interface (e.g., SATA). A detailed discussion on the architecture of SSDs is given in [4] and [27]. 7.3.2 THE FLASH TRANSLATION LAYER (FTL) The idiosyncrasies of Flash memory, such as its inability to do efficient in-place writes, break the conventional block-based device abstraction that rotating magnetic disk drives have provided to the other layers of the system stack. Furthermore, there is an asymmetry in the read, write, and erase latencies to Flash memory that further complicates Flash memory management. (The typical read, write, and erase latencies of an SLC Flash chip are approximately 25 microseconds, 200 microseconds, and 1.5 milliseconds, respectively [170]).
No longer available |Learn more- (Author)
- 2014(Publication Date)
- Research World(Publisher)
____________________ WORLD TECHNOLOGIES ____________________ Chapter 9 Solid-State Drive An SSD in standard 2.5-inch (64 mm) form-factor DDR SDRAM based SSD ____________________ WORLD TECHNOLOGIES ____________________ PCI attached IO Accelerator SSD PCI-E, DRAM, and NAND based SSD A solid-state drive (SSD) is a data storage device that uses solid-state memory to store persistent data with the intention of providing access in the same manner of a traditional block i/o hard disk drive. SSDs are distinguished from traditional hard disk drives (HDDs), which are electromechanical devices containing spinning disks and movable read/write heads. SSDs, in contrast, use microchips which retain data in non-volatile memory chips and contain no moving parts. Compared to electromechanical HDDs, SSDs are typically less susceptible to physical shock, quieter, and have lower access time ____________________ WORLD TECHNOLOGIES ____________________ and latency. SSDs use the same interface as hard disk drives, thus easily replacing them in most applications. As of 2010, most SSDs use NAND-based flash memory, which retains memory even without power. SSDs using volatile random-access memory (RAM) also exist for situations which require even faster access, but do not necessarily need data persistence after power loss, or use external power or batteries to maintain the data after power is removed. A hybrid drive combines the features of an HDD and an SSD in one unit, containing a large HDD, with a smaller SSD cache to improve performance of frequently accessed files. These can offer near-SSD performance in most applications (such as system startup and loading applications) at a lower price than an SSD. These are not suitable for data-intensive work, nor do they offer the other advantages of SSDs.
eBook - PDF- Greg Schulz(Author)
- 2016(Publication Date)
- Auerbach Publications(Publisher)
Which drive to use depends on the application; increasingly, a mix of high-speed FC or SAS drives is configured in a storage system with some number of lower-performing, high-capacity or FAT HDDs for a tiered storage solution in a box. 8.4.2.1 Solid-State Devices (SSDs) The need for more effective I/O performance is linked to the decades old, and still growing, gap between server and storage performance, where the performance of HDD storage has not kept up with the decrease in cost and increase in reliability and capacity compared to improvements in server pro-cessing power. Reducing energy consumption is important for many IT data centers. Although there is discussion about reducing energy by doing less work or powering down storage to reduce energy use, the trend is toward doing more with less power per unit of work. This includes intelligent power man-agement when power consumption can be reduced without compromising application performance or availability as well as doing more IOPS or band-width per watt of energy. FLASH is relatively low-cost and persistent memory that does not lose its content when power is turned off. USB thumb drives are a common example. DDR/RAM is dynamic memory that is very fast but is not persis-tent, and data is lost when power is removed. DDR/RAM is also more expensive than FLASH. Hybrid approaches combine FLASH for persis-tency, high capacity, and low cost with DDR/RAM for performance. There is a myth that SSD is only for databases and that SSD does not work with files. The reality is that in the past, given the cost of DRAM-based solutions, specific database tables or files, indices, log or journal files, or other transient performance-intensive data were put on SSDs. If the data-base were small enough or the budget large enough, the entire database may have been put on SSDs. Given the cost of DRAM and FLASH, however, many new applications and usage scenarios are leveraging SSD technologies.
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