Hybrid storage systems that consist of flash-based solid state drives (SSDs) and traditional disks are now widely used. In hybrid storage systems, there exists a two-level cache hierarchy that regard dynamic random access memory (DRAM) as the first level cache and SSD as the second level cache for disk storage. However, this two-level cache hierarchy typically uses independent cache replacement...

Few cloud storage systems can handle random read accesses efficiently. In this paper, we present a RAMCloud Storage System, RCSS, to enable efficient random read accesses in cloud environments. Based on the Hadoop Distributed File System (HDFS), RCSS integrates the available memory resources in an HDFS cluster to form a cloud storage system, which backs up all data on HDFS-managed disks, and fe...

This paper proposes a new sub-threshold low power 9T static random-access memory (SRAM) cell compatible with bit interleaving structure in which the effective sizing adjustment of access transistors in write mode is provided  by isolating writing and reading paths. In the proposed cell, we consider a weak inverter to make better write mode operation. Moreover applying boosted word line feature ...

Modeling and simulation are flexible and effective tools to design and evaluate the performance of Storage Area Network (SAN). Fibre Channel (FC) is presently the dominant protocol used in SAN. In this paper, we present a new simulation SANSim, developed for modeling and analyzing FC storage network. SANSim includes four main modules: an I/O workload module, a host module, a storage network mod...

The rapidly declining cost of persistent RAM technologies prompts the question of when, not whether, such memory will become the preferred storage medium for many computers. Conquest is a file system that provides a transition from disk to persistent RAM as the primary storage medium. Conquest provides two specialized and simplified data paths to in-core and on-disk storage, and Conquest realiz...

We propose a wavelet based method for compressing volumetric data with little loss in quality. The method supports fast random access to individual voxels within the compressed volume. Such a method is important since storing and visualising very large volumes impose heavy demands on internal memory and external storage facilities making it accessible only to users with huge and expensive compu...

The use of cache memory makes the processing of access in a faster rate. The main purpose of cache memory is to give faster memory access by which the data read should be fast and at the same period d provide less expensive and types of semiconductor memories which are of large memory size. There is correspondingly main memory which is large but slow together with a smaller as well faster cache...

We propose a practice-oriented scheme for protecting RAM access pattern. We first consider an instance which relies on the use of a secure (trusted) hardware buffer; it achieves both security and performance levels acceptable in practice by adapting ideas from oblivious RAM mechanisms, yet without the expensive (re-)shuffling of buffers. Another instance requires no special hardware, but as a r...

We describe the first DNA-based storage architecture that enables random access to data blocks and rewriting of information stored at arbitrary locations within the blocks. The newly developed architecture overcomes drawbacks of existing read-only methods that require decoding the whole file in order to read one data fragment. Our system is based on new constrained coding techniques and accompa...