A Buffer Management Issue in Designing SSDs for LFSs

Kim, Jaegeuk; Seol, Jinho; Maeng, Seungryoul

doi:10.1587/transinf.e93.d.1644

Cited by 5 publications

(6 citation statements)

References 10 publications

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“…Their scheme identifies hot data based on two factors: frequent updates to a data item and irregular allocation. 55,56 DRAM is used for data that cannot be identified as cold or hot. Hot and cold data are stored in SLC and MLC registers, respectively, from where they are transferred 16 Working of the technique of Matsui et al 24 (RAM refers to an SCM, eg, ReRAM) to SLC and MLC chips, respectively.…”

Section: Number Of Physical Blocks In Slc Cb Is Same As the Number Ofmentioning

confidence: 99%

“…Writing and updating of data in the registers is performed similar to previous techniques. () DRAM is used for data that cannot be identified as cold or hot. If the write request does not update existing data and is not sequential, LSN of write request is stored in DRAM buffer if DRAM buffer contains less than a threshold number of LSNs.…”

Section: Buffer Design and Management Techniquesmentioning

confidence: 99%

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A survey of techniques for architecting SLC/MLC/TLC hybrid Flash memory–based SSDs

Alsalibi

Mittal

Al-Betar

et al. 2018

Concurrency and Computation

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Flash memory-based solid-state drives (SSDs) offer several attractive features and benefits compared to hard disk drive (HDD), such as shock resistance and better performance especially for random data access. Depending on the number of bits in each cell, Flash memory can be designed as single/multi/triple level cell (SLC/MLC/TLC), which have different performance, density, cost and write endurance characteristics. To bring the best of these together, several researchers have proposed designing SSD using hybrid SLC/MLC/TLC Flash memory. However, these SSDs also present several challenges such as buffer management, placement of hot/cold data in suitable portion, and intelligent garbage collection. Several recent techniques aim to address these challenges.In this paper, we present a survey of techniques for managing SSDs designed with SLC/MLC/TLC Flash memory. We classify the works on several axes to bring out their similarities and differences.We aim to synthesize the state-of-art progress in hybrid SSD management and also spark further research in this area. KEYWORDSflash translation layer, garbage collection, hybrid solid state disk, NAND flash memory, wear leveling INTRODUCTIONAs the amount of digital data continues to grow at an exponential rate and key applications become more data intensive, efficient storage architectures and management techniques have become more important than ever before. Conventionally, hard disk drive* has been used as a storage device; however, its limitations such as poor performance (especially for random accesses), higher form factor, and vulnerability to shocks and magnetic fields have encouraged researchers to explore its alternatives.Flash memory is a promising technology for designing storage devices due to its several attractive properties, eg, high performance and density, low power consumption, noise-free operation, and immunity to shocks and magnetic fields. 2-6 Also, its cost has been decreasing in recent years and it is expected to provide even better cost efficiency than HDD in near future. Based on the number of bits stored in each cell, Flash can be characterized as SLC (1 bit), MLC † (2 bit) and TLC (3 bits). As shown in Table 1, these cell types provide a spectrum of properties and trade-offs. Specifically, on going from SLC to MLC to TLC, the performance and write endurance decrease whereas density and cost efficiency improve.To achieve the best of these three cell types, hybrid SSD designs have been proposed, which use Flash memories of multiple cell types to improve performance, energy efficiency, and reliability. 16 However, these hybrid SSD designs also bring challenges, such as selection of relative proportion of SLC/MLC/TLC, efficient mapping/moving of hot/cold data to them, accounting for their disparate write endurance and density values, and

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Section: Number Of Physical Blocks In Slc Cb Is Same As the Number Ofmentioning

confidence: 99%

Section: Buffer Design and Management Techniquesmentioning

confidence: 99%

A survey of techniques for architecting SLC/MLC/TLC hybrid Flash memory–based SSDs

Alsalibi

Mittal

Al-Betar

et al. 2018

Concurrency and Computation

View full text Add to dashboard Cite

show abstract

“…Technically, there are two basic types of SSD storage systems, Multi-Level Cell (MLC), and Single Level Cell (SLC) [11,17,21]. The main differences between these two types are concerning with the number of writing cycles [8,10], and the storage capacity level, which mainly affected the SSD media life span [10,14,21,22]. Physically, there are three main components that SSD data storage system consists of, the flash package, SSD controller and host interface logic [7,12,14].…”

Section: Introductionmentioning

confidence: 99%

“…These components are simplified and illustrated in the following figure. The controller as shown in figure 1, consist of three main parts, processor, buffer manager, and flash demux/mux integrated circuit [14]. The main function of the processor is to manage the flow of data and mappings from the logical block address to physical locations [5,11,14].…”

Section: Introductionmentioning

confidence: 99%

“…The controller as shown in figure 1, consist of three main parts, processor, buffer manager, and flash demux/mux integrated circuit [14]. The main function of the processor is to manage the flow of data and mappings from the logical block address to physical locations [5,11,14]. Respectively, the buffer manager will speed up the processing time required for performing several storage system functions, such as reading or writing operations [9,10], while flash demux/mux is to managing instructions and data transport processes along the serial connections to the flash packages [13,15].…”

Section: Introductionmentioning

confidence: 99%

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An Overview of Video Allocation Algorithms for Flash-based SSD Storage Systems

Al-Sabateen¹,

Alomari²,

Sumari³

2012

IJACSA

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Abstract-Despite the fact that Solid State Disk (SSD) data storage media had offered a revolutionary property storages community, but the unavailability of a comprehensive allocation strategy in SSDs storage media, leads to consuming the available space, random writing processes, time-consuming reading processes, and system resources consumption. In order to overcome these challenges, an efficient allocation algorithm is a desirable option. In this paper, we had executed an intensive investigation on the SSD-based allocation algorithms that had been proposed by the knowledge community. An explanatory comparison had been made between these algorithms. We reviewed these algorithms in order to building advanced knowledge armature that would help in inventing new allocation algorithms for this type of storage media.

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Data pattern aware FTL for SLC+MLC hybrid SSD

Kwon

Chung

2014

Des Autom Embed Syst

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A Buffer Management Issue in Designing SSDs for LFSs

Cited by 5 publications

References 10 publications

A survey of techniques for architecting SLC/MLC/TLC hybrid Flash memory–based SSDs

A survey of techniques for architecting SLC/MLC/TLC hybrid Flash memory–based SSDs

An Overview of Video Allocation Algorithms for Flash-based SSD Storage Systems

Data pattern aware FTL for SLC+MLC hybrid SSD

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