TY - THES A1 - Tuschl, Roland T1 - Ein Userspace-Dateisystem zur Verwaltung von Grid-Daten T1 - A Userspace Filesystem for the Management of Grid Data N2 - Das Ziel dieser Arbeit ist die Schaffung einer Zugriffs-Komponente für das Grid-Datenmanagement-System ZIB-DMS, das dessen transparente Einbindung in den Verzeichnisbaum eines Linux-Systems erlaubt. Dazu wird unter Verwendung des FUSE-Rahmenwerkes ein Userspace-Dateisystem mit Anbindung an das ZIB-DMS konzipiert und implementiert. Im Fokus stehen dabei die Abbildung der erweiterten Verwaltungsmechanismen des Systems auf die limitierte Schnittstelle hierarchischer Dateisysteme und die dazu notwendigen Änderungen am ZIB-DMS. N2 - The goal of this work is to create an access component for the Grid data management system ZIB-DMS, that allows a transparent integration into the directory tree of a Linux system. For this purpose the FUSE framework is used to design and implement a userspace file system with connections to the ZIB-DMS. The focus is on the mapping of the extended management mechanisms of the system to the limited interface of hierarchical file systems and the therefore necessary changes to ZIB-DMS. KW - Dateisystem KW - Grid KW - Datenmanagement KW - filesystem KW - Grid KW - data management Y1 - 2009 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-11483 ER - TY - GEN A1 - Schintke, Florian A1 - Reinefeld, Alexander T1 - On the Cost of Reliability in Large Data Grids N2 - Global grid environments do not only provide massive aggregated computing power but also an unprecedented amount of distributed storage space. Unfortunately, dynamic changes caused by component failures, local decisions, and irregular data updates make it difficult to efficiently use this capacity. In this paper, we address the problem of improving data availability in the presence of unreliable components. We present an analytical model for determining an optimal combination of distributed replica catalogs, catalog sizes, and replica servers. Empirical simulation results confirm the accuracy of our theoretical analysis. Our model captures the characteristics of highly dynamic environments like peer-to-peer networks, but it can also be applied to more centralized, less dynamic grid environments like the European {\em DataGrid}. T3 - ZIB-Report - 02-52 KW - replication KW - availability KW - reliability KW - distributed catalog KW - data grid Y1 - 2002 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-7195 ER - TY - GEN A1 - Best, Christoph T1 - A simple C++ library for manipulating scientific data sets as structured data N2 - Representing scientific data sets efficiently on external storage usually involves converting them to a byte string representation using specialized reader/writer routines. The resulting storage files are frequently difficult to interpret without these specialized routines as they do not contain information about the logical structure of the data. Avoiding such problems usually involves heavy-weight data format libraries or data base systems. We present a simple C++ library that allows to create and access data files that store structured data. The structure of the data is described by a data type that can be built from elementary data types (integer and floating-point numbers, byte strings) and composite data types (arrays, structures, unions). An abstract data access class presents the data to the application. Different actual data file structures can be implemented under this layer. This method is particularly suited to applications that require complex data structures, e.g. molecular dynamics simulations. Extensions such as late type binding and object persistence are discussed. T3 - ZIB-Report - TR-98-06 KW - scientific file formats KW - structured data KW - object persistence Y1 - 1998 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-5674 ER -