scholarly journals Assessing the Role of Program Suspend Operation in 3D NAND Flash Based Solid State Drives

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1394
Author(s):  
Cristian Zambelli ◽  
Lorenzo Zuolo ◽  
Antonio Aldarese ◽  
Salvatrice Scommegna ◽  
Rino Micheloni ◽  
...  
Keyword(s):  
Solid State ◽  
System Level ◽  
Nand Flash ◽  
Mass Storage ◽  
System Quality ◽  
Solid State Drives ◽  
Storage Media ◽  
Dense Mass

3D NAND Flash is the preferred storage medium for dense mass storage applications, including Solid State Drives and multimedia cards. Improving the latency of these systems is a mandatory task to narrow the gap between computing elements, such as CPUs and GPUs, and the storage environment. To this extent, relatively time-consuming operations in the storage media, such as data programming and data erasing, need to be prioritized and be potentially suspendable by shorter operations, like data reading, in order to improve the overall system quality of service. However, such benefits are strongly dependent on the storage characteristics and on the timing of the single operations. In this work, we investigate, through an extensive characterization, the impacts of suspending the data programming operation in a 3D NAND Flash device. System-level simulations proved that such operations must be carefully characterized before exercising them on Solid State Drives to eventually understand the performance benefits introduced and to disclose all the potential shortcomings.

scholarly journals Quality in crisis: a systematic review of the quality of health systems in humanitarian settings

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Keely Jordan ◽  
Todd P. Lewis ◽  
Bayard Roberts
Keyword(s):  
Systematic Review ◽  
Health System ◽  
Health Systems ◽  
Point Of Care ◽  
System Level ◽  
System Quality ◽  
High Quality ◽  
Humanitarian Settings ◽  
Quality Health

Abstract Background There is a growing concern that the quality of health systems in humanitarian crises and the care they provide has received little attention. To help better understand current practice and research on health system quality, this paper aimed to examine the evidence on the quality of health systems in humanitarian settings. Methods This systematic review was based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) protocol. The context of interest was populations affected by humanitarian crisis in low- and middle- income countries (LMICs). We included studies where the intervention of interest, health services for populations affected by crisis, was provided by the formal health system. Our outcome of interest was the quality of the health system. We included primary research studies, from a combination of information sources, published in English between January 2000 and January 2019 using quantitative and qualitative methods. We used the High Quality Health Systems Framework to analyze the included studies by quality domain and sub-domain. Results We identified 2285 articles through our search, of which 163 were eligible for full-text review, and 55 articles were eligible for inclusion in our systematic review. Poor diagnosis, inadequate patient referrals, and inappropriate treatment of illness were commonly cited barriers to quality care. There was a strong focus placed on the foundations of a health system with emphasis on the workforce and tools, but a limited focus on the health impacts of health systems. The review also suggests some barriers to high quality health systems that are specific to humanitarian settings such as language barriers for refugees in their host country, discontinued care for migrant populations with chronic conditions, and fears around provider safety. Conclusion The review highlights a large gap in the measurement of quality both at the point of care and at the health system level. There is a need for further work particularly on health system measurement strategies, accountability mechanisms, and patient-centered approaches in humanitarian settings.

scholarly journals The Nature and Role of User Beliefs Regarding a Website's Design Quality

2020 ◽  
Vol 32 (1) ◽  
pp. 75-96 ◽  
Author(s):  
Camille Grange ◽  
Henri Barki
Keyword(s):  
Information Quality ◽  
Past Research ◽  
Design Guidelines ◽  
Ease Of Use ◽  
Research Model ◽  
System Quality ◽  
Design Quality ◽  
It Acceptance

Researchers and practitioners have long been interested in identifying the criteria that users consider important in assessing whether a system is worth using. However, past research in this domain has not taken into account the characteristics of a system's design and their quality in a systematic and comprehensive manner, which is likely to have limited the development of actionable design guidelines. The article addresses this issue by suggesting a research model that links user beliefs—which have traditionally been used in IT acceptance and success research (i.e., information quality, system quality, usefulness, and ease of use)—to their beliefs regarding the quality of three categories of a system's design (i.e., visual quality, page layout quality, and navigation quality) and testing it in the context of organizational intranets. The analysis of data collected from 159 intranet website users in three organizations supported the model, suggesting that the three categories of design quality beliefs significantly influenced users' assessment of their system's information quality and system quality.

Quality

2020 ◽  
pp. 166-183
Author(s):  
Julie Sin
Keyword(s):  
Health Services ◽  
Health System ◽  
Services Quality ◽  
Quality Care ◽  
System Level ◽  
Quality Of Services ◽  
Provider Perspective ◽  
Multidimensional Concept

This chapter looks at the topic of health services quality from a commissioning and whole population perspective. Quality is noted to be a multidimensional concept and dimensions of quality are considered. The role of the commissioner in maintaining and improving quality of services is explored, and this is seen within a wider backdrop of a health system with commissioner and provider functions (if there are such distinctions in the system). Commissioners need to know whether they are securing quality care for their population for the money spent. They also need an understanding of how this dovetails with the provider perspective on this topic. Commissioners also need to be able to articulate what they wish to assess in practice under the guise of quality. Finally, at a system level there are also bearings on how to compile and interpret a picture of a population’s health if needed.

Modeling the Endurance Reliability of Intradisk RAID Solutions for Mid-1X TLC NAND Flash Solid-State Drives

2017 ◽  
Vol 17 (4) ◽  
pp. 713-721 ◽  
Author(s):  
Cristian Zambelli ◽  
Alessia Marelli ◽  
Rino Micheloni ◽  
Piero Olivo
Keyword(s):  
Solid State ◽  
Nand Flash ◽  
Solid State Drives

scholarly journals HMB-I/O: Fast Track for Handling Urgent I/Os in Nonvolatile Memory Express Solid-State Drives

2020 ◽  
Vol 10 (12) ◽  
pp. 4341
Author(s):  
Kyusik Kim ◽  
Seongmin Kim ◽  
Taeseok Kim
Keyword(s):  
Quality Of Service ◽  
Solid State ◽  
User Satisfaction ◽  
Nonvolatile Memory ◽  
Fast Track ◽  
Solid State Drives ◽  
Solid State Drive ◽  
Memory Buffer

Differentiated I/O services for applications with their own requirements are very important for user satisfaction. Nonvolatile memory express (NVMe) solid-state drive (SSD) architecture can improve the I/O bandwidth with its numerous submission queues, but the quality of service (QoS) of each I/O request is never guaranteed. In particular, if many I/O requests are pending in the submission queues due to a bursty I/O workload, urgent I/O requests can be delayed, and consequently, the QoS requirements of applications that need fast service cannot be met. This paper presents a scheme that handles urgent I/O requests without delay even if there are many pending I/O requests. Since the pending I/O requests in the submission queues cannot be controlled by the host, the host memory buffer (HMB), which is part of the DRAM of the host that can be accessed from the controller, is used to process urgent I/O requests. Instead of sending urgent I/O requests into the SSDs through legacy I/O paths, the latency is removed by directly inserting them into the HMB. Emulator experiments demonstrated that the proposed scheme could reduce the average and tail latencies by up to 99% and 86%, respectively.

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