Design and Research of Multiple Data Channels in Solid State Recorder of the Satellite SJ-10

2014 ◽  
Vol 1073-1076 ◽  
pp. 1977-1981
Author(s):  
Qi Song ◽  
Shan Li ◽  
Yan Zhu ◽  
Jun She An
Keyword(s):  
Solid State ◽  
Data Flow ◽  
Storage System ◽  
High Capacity ◽  
Scientific Data ◽  
System Throughput ◽  
Nand Flash ◽  
Multiple Data ◽  
File System Management ◽  
Solid State Recorder

Space borne high-capacity solid state recorder (SSR) is an inevitable chain of the space scientific data acquirement system. It has become a common device in spacecraft gradually. This paper presents the design and accomplishment of the large capacity SSR design based on NAND flash of the satellite SJ-10. The SSR improves its writing speed significantly by applying multi-pipeline writing technique. External SDRAM is used as the channel cache of the multi-channel data flows to increase the cache capacity and system throughput speed. In addition, the EDAC processing, data flow combining and separating can enhance the stability of the storage system as well as the data efficiently. The implementing of multi-channel has also laid the foundation for file system management of the space borne storage data. The simulation of multi-channel data flow is given in this paper.

WLVT: A Static Wear-Leveling Algorithm with Variable Threshold

2013 ◽  
Vol 756-759 ◽  
pp. 3131-3135
Author(s):  
Yuan Hua Yang ◽  
Xian Bin Xu ◽  
Shui Bing He ◽  
Fang Zhen ◽  
Yu Ping Zhang
Keyword(s):  
Solid State ◽  
Flash Memory ◽  
Storage System ◽  
Nand Flash ◽  
Nand Flash Memory ◽  
Wear Leveling ◽  
Variable Threshold ◽  
Solid State Disk ◽  
The Poor ◽  
Traditional Algorithm

NAND flash memory has been successfully employed in storage system due to its advantages such as performance, resistance, and capacity. NAND flash memory based solid state disk (SSD) has started to replace disk in numerous environments. However, the poor endurance offered by these SSDs continues to be their key shortcoming. To improve SSD endurance, we propose a static wear-leveling algorithm with variable threshold (WLVT). In contrast with traditional algorithm with fixed threshold, WLVT adjusts the value of threshold, so that each block can simultaneously reach the erasure times that the manufacturer gives when life of SSD is over. Therefore, available erasure time of each block will be fully utilized when SSD fails. Experimental results show that the endurance of the SSD is significantly improved.

h-Hash: A Hash Index Structure for Flash-Based Solid State Drives

2015 ◽  
Vol 24 (09) ◽  
pp. 1550128 ◽  
Author(s):  
Bo-Kyeong Kim ◽  
Sang-Won Lee ◽  
Dong-Ho Lee
Keyword(s):  
Solid State ◽  
Flash Memory ◽  
High Reliability ◽  
Storage System ◽  
Index Structure ◽  
Nand Flash ◽  
Solid State Drives ◽  
Nand Flash Memory ◽  
Operation Speed ◽  
Fast Access

Flash-based solid state drives (SSDs) have been widely used as storage medium because of their fast access speed, high reliability and low power consumption. In spite of these advantages, they inherit distinct characteristics such as no in-place updates, asymmetric operation speed and unit because they consist of NAND flash memories. Therefore, a disk-based hash index structure may result in severe performance degradation if it is directly deployed on a NAND flash memory-based storage system. In this paper, we propose a new hybrid hash index structure for flash-based SSDs. It delays and reduces the split operations which cause slow block erasure and additional read and write operations by exploiting overflow buckets according to the ratio of updates and deletions. Through various performance evaluations, we show the superiority of our proposed index structure by comparing it to other hash index structures for flash-based SSDs.

A user-visible solid-state storage system with software-defined fusion methods for PCM and NAND flash

2016 ◽  
Vol 71 ◽  
pp. 44-61 ◽  
Author(s):  
Zheng Li ◽  
Fang Wang ◽  
Jingning Liu ◽  
Dan Feng ◽  
Yu Hua ◽  
...  
Keyword(s):  
Solid State ◽  
Storage System ◽  
Nand Flash ◽  
Fusion Methods
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