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...

To meet the bandwidth needs of modern computer systems, parallel storage systems are evolving beyond RAID levels 1 through 5. The Parallel Data Lab at Carnegie Mellon University has constructed three Scotch parallel storage testbeds to explore and evaluate five directions in RAID evolution: first, the development of new RAID architectures to reduce the cost/performance penalty of maintaining re...

We report on our investigations on some technologies that can be used to build disk servers and networks of disk servers using commodity hardware and software solutions. It focuses on the performance that can be achieved by these systems and gives measured gures for di erent con gurations. It is divided into two parts : iSCSI and other technologies and hardware and software RAID solutions. The ...

The main aim of this paper is to present MOGUL, a Methodology to Obtain Genetic fuzzy rule-based systems Under the iterative rule Learning approach. MOGUL will consist of some design guidelines that allow us to obtain diierent Genetic Fuzzy Rule-Based Systems, i. e., evolutionary algorithm-based processes to automatically design Fuzzy Rule-Based Systems by learning and/or tuning the Fuzzy Rule ...

We sought to determine if verapamil induces frequency-dependent prolongation of atrioventricular nodal conduction in 10 consecutive patients studied in the electrophysiology laboratory. We used a maintenance infusion of verapamil designed to produce plasma concentrations of verapamil in the "therapeutic" range and that did not alter heart rate or blood pressure significantly. Frequency-dependen...

BACKGROUND The Rheumatoid Arthritis Impact of Disease (RAID) score was developed as a European League Against Rheumatism initiative to obtain a patient reported outcome score for clinical trials in patients with rheumatoid arthritis (RA), based on patients' perception of the impact of the disease on several domains of health. The objective of this study was to assess the content validity of thi...

The toxicities of Raid Max Roach Bait (sulfluramid) and COMBAT Roach Control System (hydramethylnon) to susceptible and field-collected German cockroaches were examined. In all field-collected strains, a variable fraction of the population exhibited tolerance to Raid Max. In some strains, few males were killed in the first 5 d of exposure to Raid Max and some lived for up to 123 d when provided...

The Cambridge Structural Database (CSD) currently contains over 310,000 structure determinations for small molecule organic and organometallic compounds, and thus is a good source of information on molecular geometries and conformational preferences. The program Mogul (Molecular Geometry Library) has been developed by the CCDC to provide rapid access to this information with full statistics. To...

............................................................................................................................................. 2 Overview of the RAID 5 rebuild process ................................................................................................. 2 Estimating the mean-time-to-failure (MTTF) ..........................................................................

In a serverless cluster of PCs or workstations, the cluster must allow remote file accesses or parallel I/O directly performed over disks distributed to all client nodes. We introduce a new distributed disk array, called the RAID-x, for use in serverless clusters. The RAID-x architecture is based on an orthogonal striping and mirroring (OSM) scheme, which exploits full-bandwidth and protects th...