As disk volume grows rapidly with terabyte disk becoming a norm, RAID reconstruction process in case of a failure takes prohibitively long time. This paper presents a new RAID architecture, S2-RAID, allowing the disk array to reconstruct very quickly in case of a disk failure. The idea is to form skewed sub-arrays in the RAID structure so that reconstruction can be done in parallel dramatically...

The paper focuses on the development of a new method for extreme value estimation based on sampled financial time series. Of particular concern is the case when the extreme values asymptotically follow the Fréchet distribution. The method is designed to account for statistical dependence between the data points of the time series in a rational way. The proposed procedure avoids the problem of d...

• Clustering of exceedances of a critical level is a phenomenon that concerns risk managers in many areas. The extremal index θ measures the propensity of the large observations in a dataset to cluster. Thus the estimation of θ is an important issue recurrently addressed in literature. Besides a declustering parameter, inference also depends on a threshold. This choice is actually a crucial top...

Environments Steven A. Moyer V. S. Sunderam Department of Mathematics and Computer Science Emory University, Atlanta, GA 30322, U.S.A. fmoyer, [email protected] Abstract PIOUS is a parallel le system architecture that provides cost-e ective, scalable bandwidth in a network computing environment. PIOUS employs data declustering, to exploit the combined le I/O and bu er cache capacities of ne...

It often appears that the most appropriate form of addressing disadvantage related to disability is through policies that can be called ‘status enhancements’: changes to the social, cultural and material environment so that the difficulties experienced by those with impairments are reduced, even eradicated. However, status enhancements can also have their limitations. This paper compares the re...

Several algorithms for parallel disk systems have appeared in the literature recently and they are asymptotically optimal in terms of the number of disk accesses Scalable systems with parallel disks must be able to run these algorithms We present for the rst time a list of capabilities that must be provided by the system to support these optimal algorithms control over declustering querying abo...

Personal computer/workstation (PC/WS) clusters have come to be studied intensively in the field of parallel and distributed computing. They are considered to play an important role as a large scale computer system in the next generation, such as large server sites and/or high performance parallel computers, because of their good scalability and cost performance ratio. In the viewpoint of applic...