In a serverless cluster of computers, all local disks can be integrated as a distributed software RAID (ds-RAID) with a single I/O space. This paper presents the architecture and performance of a new RAID-x for building ds-RAID. Through experimentation, we evaluate the RAID-x along with RAID-5, chained-declustering, and RAID-10 architectures, all embedded in a Linux cluster environment. All fou...

The RAID-6 specification calls for a storage system with multiple storage devices to tolerate the failure of any two devices. Numerous erasure coding techniques have been developed that can implement RAID-6; however, each has limitations. In this paper, we describe a new class of RAID-6 codes called the Liberation Codes. These codes encode, update and decode either optimally or close to optimal...

The paper contains preliminary results from an investigation comparing Linux and WindowsXP disk I/O using kernel-based software RAID on identical hardware. WindowsXP performance is shown to be substantially superior to Linux performance, for reasons not currently understood. One known problem with the Linux RAID driver is that in Linux 2.4 file I/O is synchronous and file operations are seriali...

© Initial Experiments in Visualizing Fine-Grained Execution of Parallel Software Through Cycle-Level Simulation Rick Strong, Jayaram Mudigonda, Jeffrey Mogul, Nathan Binkert

Manifold Ranking is a graph-based ranking algorithm being successfully applied to retrieve images from multimedia databases. Given a query image, Manifold Ranking computes the ranking scores of images in the database by exploiting the relationships among them expressed in the form of a graph. Since Manifold Ranking effectively utilizes the global structure of the graph, it is significantly bett...

RAID storage systems have been in use since the early 1990’s. Recently, however, as the demand for huge amounts of on-line storage has increased, RAID has once again come into focus. This report reviews the history of RAID, as well as where and how RAID systems fit in the storage hierarchy of an Enterprize Computing System (EIS). We describe the known RAID configurations and the advantages and ...

Hepatitis E virus (HEV) infection is a common cause of acute viral hepatitis (AVH) in Egypt. We aimed to identify risk factors of HEV among acute hepatitis cases, measure HEV specific immune response to differentiate between symptomatic and asymptomatic infections. The study included symptomatic acute hepatitis (AH) patients (n = 235) and asymptomatic contacts (n = 200) to HEV cases. They compl...

TPT-RAID is a multi-box RAID wherein each ECC group comprises at most one block from any given storage box, and can thus tolerate a box failure. It extends the idea of an out-of-band SAN controller into the RAID: data is sent directly between hosts and targets and among targets, and the RAID controller supervises ECC calculation by the targets. By preventing a communication bottleneck in the co...