scholarly journals Design and Implementation of Sequential Read Ahead in Zoned Namespaces for Solid State Drives

2020 ◽  
Vol 5 (5) ◽  
pp. 1985-1988
Author(s):  
Adnan Asad Vohra ◽  
Dr. Srividya P
Keyword(s):  
Form Factor ◽  
Solid State ◽  
Data Storage ◽  
Sequential Data ◽  
Solid State Drives ◽  
Normal Functioning ◽  
Ongoing Research ◽  
Design And Implementation ◽  
Solid State Devices ◽  
Read Request

In the day and age of data and information, the ability to retrieve the information becomes of paramount importance. The cutting edge technology in terms of data storage is currently Solid State Devices which use NAND gates to store data. This relatively new method of storing data presents numerous avenues of research and breakthroughs. The concept of Zoned Namespaces in SSD firmware is one such major avenue of ongoing research. The objective of this paper is to understand the need for higher data accessing speeds and envisioning the advancements made possible by improving basic read and write speeds in SSD's. The goal is to allow for writing sequential data in namespaces where the data related to each other holds a granularity of a single zone. The idea is achieved by implementing sequential read ahead where the sequential data is read ahead of time by anticipating host read request to that data. This gives the host, cache hit on requested data which greatly improves performance. The pre-fetched data is cleared from cache once the data has been read or any disabling condition occurs thus not hampering normal functioning of the drive. The implementation was tested on a 8 TB form factor SSD. The results for reads were 70 MB/s for ZNS before SRA and 275 MB/s after SRA enablement. Thus a very significant increase is observed which proves that the objective was achieved.

scholarly journals Mitigating Self-Heating in Solid State Drives for Industrial Internet-of-Things Edge Gateways

Electronics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1179
Author(s):  
Cristian Zambelli ◽  
Lorenzo Zuolo ◽  
Luca Crippa ◽  
Rino Micheloni ◽  
Piero Olivo
Keyword(s):  
Solid State ◽  
Internet Of Things ◽  
Data Storage ◽  
Storage Temperature ◽  
Nand Flash ◽  
Solid State Drives ◽  
Industrial Internet Of Things ◽  
Self Heating ◽  
Industrial Internet ◽  
Protection Mechanisms

Data storage in the Industrial Internet-of-Things scenario presents critical aspects related to the necessity of bringing storage devices closer to the point where data are captured. Concerns on storage temperature are to be considered especially when Solid State Drives (SSD) based on 3D NAND Flash technology are part of edge gateway architectures. Indeed, self-heating effects caused by oppressive storage demands combined with harsh environmental conditions call for proper handling at multiple abstraction levels to minimize severe performance slow downs and reliability threats. In this work, with the help of a SSD co-simulation environment that is stimulated within a realistic Industrial Internet-of-Things (IIoT) workload, we explore a methodology orthogonal to performance throttling that can be applied in synergy with the operating system of the host. Results evidenced that by leveraging on the SSD micro-architectural parameters of the queuing system it is possible to reduce the Input/Output operations Per Second (IOPS) penalty due to temperature protection mechanisms with minimum effort by the system. The methodology presented in this work opens further optimization tasks and algorithmic refinements for SSD and system designers not only in the IIoT market segment, but generally in all areas where storage power consumption is a concern.

scholarly journals Development of Algorithm to Enhance the Security Feature of SATA on Solid State Drives

2019 ◽  
Vol 8 (6S) ◽  
pp. 193-198
Keyword(s):  
Solid State ◽  
Data Storage ◽  
User Authentication ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Solid State Drives ◽  
Flash Memories ◽  
Storage Devices ◽  
Storage Media ◽  
Security Feature

Now a day’s quantity of data growing day by day accordingly the size of storage media is also increasing rapidly. In most of the storage devices flash memories are used one of them is Solid State drive. Solid state drives i.e. SSDs are non-volatile data storage devices which store determined data in NAND or NOR i.e. in flash memories, which provides similar functionality like traditional hard disk (HDD). This paper provides comparative study of Solid-state drives over Hard-disk drives. Also, implementation of algorithm to enhance the security of Solid-state drives in terms of user authentication, access control and media recovery from ATA security feature set. This algorithm fulfils security principles like Authentication and Data Integrity.

Preparation of Thin Cadmium Telluride Samples for Electron Microscope Studies

1974 ◽  
Vol 32 ◽  
pp. 548-549
Author(s):  
T. J. Magee ◽  
J. Peng ◽  
J. Bean
Keyword(s):  
Electron Microscope ◽  
Sulfuric Acid ◽  
Solid State ◽  
Sample Preparation ◽  
Cadmium Telluride ◽  
Potassium Dichromate ◽  
Optical Components ◽  
The Past ◽  
Solid State Devices

Cadmium telluride has become increasingly important in a number of technological applications, particularly in the area of laser-optical components and solid state devices, Microstructural characterizations of the material have in the past been somewhat limited because of the lack of suitable sample preparation and thinning techniques. Utilizing a modified jet thinning apparatus and a potassium dichromate-sulfuric acid thinning solution, a procedure has now been developed for obtaining thin contamination-free samples for TEM examination.

scholarly journals Design and Implementation Scheme of QSFP28 Optical Transceiver for Long-Reach Transmission Using PAM4 Modulation

2021 ◽  
Vol 11 (6) ◽  
pp. 2803
Author(s):  
Jae-Woo Kim ◽  
Dong-Seong Kim ◽  
Seung-Hwan Kim ◽  
Sang-Moon Shin
Keyword(s):  
Form Factor ◽  
Low Cost ◽  
Pulse Amplitude ◽  
Small Form ◽  
Transceiver Design ◽  
Industrial Sites ◽  
Design And Implementation ◽  
Design Scheme ◽  
Implementation Scheme ◽  
Small Form Factor

A quad, small form-factor pluggable 28 Gbps optical transceiver design scheme is proposed. It is capable of transmitting 50 Gbps of data up to a distance of 40 km using modulation signals with a level-four pulse-amplitude. The proposed scheme is designed using a combination of electro-absorption-modulated lasers, transmitter optical sub-assembly, low-cost positive-intrinsic-native photodiodes, and receiver optical sub-assembly to achieve standard performance and low cost. Moreover, the hardware and firmware design schemes to implement the optical transceiver are presented. The results confirm the effectiveness of the proposed scheme and the performance of the manufactured optical transceiver, thereby confirming its applicability to real industrial sites.

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