Puyuan Yang

Learn More
Flash memory has been widely used for storage devices in various embedded systems and enterprise computing environment, due to its shock-resistance, low power consumption, non-volatile, and high I/O speed. However, its physical characteristics impose several limitations in the design of flash-based solid state disks (SSDs). For example, its write operation(More)
Flash-memory-based solid state drives (SSD) have been widely used in computer systems. Due to the high price and some specific features of SSD such as asymmetric read/write speeds and limited erasure endurance, it has been a very common solution, e.g., in modern data centers, to use hybrid storage systems involving SSD and traditional hard disks (HDD).(More)
Flash memory is widely used in embedded devices and enterprise storage systems. Currently, flash-based storage devices usually use a flash translation layer (FTL) to cope with the special features of flash memory. Many methods for the design and implementation of the FTL have been proposed, such as BAST (block-associative sector translation), FAST (fully(More)
Flash-memory-based solid-state drives (SSDs) are used widely for secondary storage. To be effective for SSDs, traditional indices have to be redesigned to cope with the special properties of flash memory, such as asymmetric read/write latencies (fast reads and slow writes) and out-of-place updates. Previous flash-optimized indices focus mainly on reducing(More)
In recent years, mobile operating systems, represented by android and iOS, have become more and more popular in smartphones. However, the energy issue in smartphones, which refers to the poor battery capacity and management schemes, has been the bottleneck to further advance the development in this area. Generally, mobile applications have to consider both(More)
Recently, it has been more and more popular to build hybrid storage systems on the basis of SSD (Solid State Drives) and HDD (Hard Disk Drive). In order to evaluate the performance of various hybrid storage based algorithms, this paper proposes a flexible simulation tool called SH-Sim. SH-Sim aims to provide a flexible virtual hybrid disk which is made up(More)
Recently, with the widely use of flash memory based solid state drives (SSDs), a lot of studies have been conducted on SSD-based data management, such as index structures, query processing, and buffer management schemes. This paper focuses on buffer schemes for SSD-based database systems. However, differing from previous studies, we concentrate on buffer(More)
  • 1