Distributed Storage

Governance, Risk, and Compliance (GRC) Management is on the edge of becoming one of the most important business activities for enterprises. Consequently, IT departments and IT service providers must sharpen their alignment to business processes and demands. Fulfilling these new requirements is supplemented by best practice frameworks, such as ITIL, which define a complete set of IT Service Management (ITSM)

High-performance liquid chromatography was used to study the stability of folate vitamers in two types of rye breads after baking and 16 weeks of frozen storage. Bread made using sourdough seeds contained less total folate (74.6 microg/100 g dry basis, expressed as folic acid) than the whole rye flour (79.8 microg/100 g dry basis) and bread leavened only with baker's yeast (82.8 microg/100 g dry basis). Most importantly, it was generated by a significant decrease in 5-CH3-H4folate form. The baking process caused some changes in folate distribution. Storage of breads at -18 degrees C for 2 weeks did not have a significant effect (p < 0.05) on total folates compared to the content directly after baking. After a 5-weeks storage period, a significant decrease (p < 0.05) in the content of total folates was recorded and it dropped on average by 14% for both type of breads. After a longer period of storage (16 weeks), a 25% loss of folates in the bread made with baker's yeast...

This paper reviews different aggregation approaches that can be applied for the integration of distributed energy resources and loads in electrical power systems. Based on this review we define a set of terms that allow a clear differentiation of aggregation approaches. These definitions provide a framework for electrical power systems analyses concerning also the interaction of different control ap- proaches. In particular the integration of Controllable Distributed Energy (CDE) units - that comprise controllable distributed generators, controllable distributed storage units and controllable distributed loads - is analysed concerning their pos- sibilities to provide ancillary services for network operation.

Bigtable is a distributed storage system for managing structured data that is designed to scale to a very large size: petabytes of data across thousands of commodity servers. Many projects at Google store data in Bigtable, including web indexing, Google Earth, and Google ...

Because of the dynamic and heterogeneous nature of a grid infrastructure, the client/server paradigm is a common programming model for these environments, where the client submits requests to several geographically remote servers for executing already deployed applications on its own data. According to this model, the applications are usually decomposed into independent tasks that are solved concurrently by the servers (the so called Data Grid applications). On the other hand, as many scientific applications are characterized by very large set of input data and dependencies among subproblems, avoiding unnecessary synchronizations and data transfer is a difficult task. This work addresses the problem of implementing a strategy for an efficient task scheduling and data management in case of data dependencies among subproblems in the same Linear Algebra application. For the purpose of the experiments, the NetSolve distributed computing environment has been used and some minor changes h...

In this paper we describe HIS, a system that enables efficient storage and querying of data organized into concept hierarchies and dispersed over a net- work. Our scheme utilizesan adaptive algorithm thatautomatically adjusts the level of indexing according to the granularity of the incoming queries, without assuming any prior knowledge of the query workload. Efficient roll-up and drill-down opera- tions

La realización de dos estudios de ámbito nacional durante 1988-89 con el objetivo de analizar la situación de la cadena de frío vacunal en España activó el interés por la logística de las vacunas entre los profesionales de la salud pública. Se realizaron utilizando la metodología de evaluación basada en tarjetas de monitorización tiempo-temperatura (informe Battersby) y encuestas transversales sobre el estado de la cadena de frío vacunal (informe Ferrando) en los niveles provincial y local (2° y 3er eslabón). Los informes técnicos pusieron de manifiesto la precariedad de la situación, identificaron los puntos débiles que ponían en riesgo la efectividad de las vacunas y favorecieron la sensibilización hacia una actividad que constituye la columna vertebral de un programa de inmunización. Las mejoras propuestas fueron incorporadas paulatinamente por las distintas comunidades autónomas, que realizaron inversiones en equipamientos materiales y formación del personal sanitario, estableciendo protocolos de gestión específicos.Two studies aiming to analyze the vaccine cold chain throughout Spain, performed from 1988-89, sparked interest in vaccine logistics among public health authorities. The studies were performed using evaluation methodology based on cold chain monitor cards with a time-temperature indicator (Battersby's report) and cross-sectional surveys on the conditions of the cold chain (Ferrando's report) in the second and third levels (provincial and local stores). The technical reports revealed the precariousness of the situation, identified the weak points that were jeopardizing the vaccines’ efficiency, and favored awareness of an activity that constitutes the vertebral column of any immunization program. The improvements proposed were gradually implemented by regional governments. More funds for equipment and personnel training were provided and specific management protocols were established.

Ability to accommodate all types of distributed storage options and renewable energy sources is one of main characteristics of smart grid. Smart grid integrates advanced sensing technologies, control methodologies and communication technologies into current power distribution systems to provide electricity to customers in a better way. Infrastructure for implementation and utilization of renewable energy sources requires distributed storage systems with high power density and high energy density. Currently, some research investigates energy management and dynamic control of distributed storage system to offer not only high power density and high energy density storage but also high efficiency and long life systems. In this paper, an intelligent energy management system is proposed to provide short-term requirements of distributed storage system in smart grid. The energy management of a distributed storage system is formulated as a nonlinear mixed-integer optimization problem. A hybrid algorithm that is combined an evolutionary algorithm with a linear programming was developed to solve the problem. Outcomes of simulation studies show the potential of solving the problem by the proposed algorithm.

Description/Abstract We prototype a storage system that provides the access performance of a well-endowed GridFTP deployment (eg, using a cluster and a parallel file-system) at the modest cost of single desktop. To this end, we integrate GridFTP and a combination of dedicated but low-bandwidth (thus cheap) storage nodes and scavenged storage from LAN-connected desktops that participate intermittently to the storage pool. The main advantage of this setup is that it alleviates the server I/O access bottleneck. Additionally, the specific ...

Peer-to-Peer networks attracted a significant amount of interest because of their capacity for resource sharing and content distribution. Content distribution applications allow personal computers to function in a coordinated manner as a distributed storage medium by contributing, searching, and obtaining digital content. Searching in unstructured P2P networks is an important problem, which has received considerable research attention. Acceptable searching techniques must provide large coverage rate, low traffic load, and optimum latency. This paper reviews flooding-based search techniques in unstructured P2P networks. It then analytically compares their coverage rate, and traffic overloads. Our simulation experiments have validated analytical results.

ABSTRACT The explosion of user generated data along with the evolution of web 2.0 applications (e.g. social networks, blogs, podcasts, etc.) has resulted in a tremendous demand for storage. With cloud computing posing as a possible all-in-one solution, "storage clouds" focus on providing distributed storage capability. We discuss the creation of a storage cloud using edge devices, based on Peer-to-Peer resource provisioning. In this approach, mobile phones, PCs/Media Centers, Set-top-boxes, modems and networked storage devices can all contribute as storage within these storage clouds. Combining all end-user edge devices may result in a scalable, very flexible storage capability that keeps the data comparatively close to the user, increasing availability, while reducing latency. This work addresses the issue of Quality of Service (QoS)-aware scheduling in a P2P storage cloud, built with edge devices by designing an optimization scheme that minimizes energy from a system perspective and simultaneously maximizing user satisfaction from the individual user perspective.