Doing Your Science While You're in Orbit

Conference · Thu Jan 01 00:00:00 EST 2009

OSTI ID:1027393

Green, Mark L ^[1]; Miller, Stephen D ^[1]; Vazhkudai, Sudharshan S ^[1]; Trater, James R ^[1]

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1. ORNL

Abstract. Large-scale neutron facilities such as the Spallation Neutron Source (SNS) located at Oak Ridge National Laboratory need easy-to-use access to Department of Energy Leadership Computing Facilities and experiment repository data. The Orbiter thick- and thinclient and its supporting Service Oriented Architecture (SOA) based services (available at https://nucleus.sns.gov) consist of standards-based components that are reusable and extensible for accessing high performance computing, data and computational grid infrastructure, and cluster-based resources easily from a user configurable interface. The primary Orbiter system goals consist of (1) developing infrastructure for the creation and automation of virtual instrumentation experiment optimization, (2) developing user interfaces for thin- and thickclient access, (3) provide a prototype incorporating major instrument simulation packages, and (4) facilitate neutron science community access and collaboration. The secure Orbiter SOA authentication and authorization is achieved through the developed Virtual File System (VFS) services, which use Role-Based Access Control (RBAC) for data repository file access, thinand thick-client functionality and application access, and computational job workflow management. The VFS Relational Database Management System (RDMS) consists of approximately 43 database tables describing 429 user accounts with 437 groups over 451,000 directories with 739,618 repository files. Over 39 million NeXus file metadata records are associated to the 12,794 unique NeXus file field/class names generated from the 42,894 repository NeXus files. Services that enable (a) summary dashboards of data repository status with Quality of Service (QoS) metrics, (b) data repository NeXus file field/class name full text search capabilities within a Google like interface, (c) fully functional RBAC browser for the read-only data repository and shared areas, (d) user/group defined and shared metadata for data repository files, (e) user, group, repository, and web 2.0 based global positioning with additional service capabilities are currently available. The SNS based Orbiter SOA integration progress with the Distributed Data Analysis for Neutron Scattering Experiments (DANSE) software development project is summarized with an emphasis on DANSE Central Services and the Virtual Neutron Facility (VNF). Additionally, the DANSE utilization of the Orbiter SOA authentication, authorization, and data transfer services best practice implementations are presented.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1027393
• Resource Relation: Conference: ICNS 2009, Knoxville, TN, USA, 20090503, 20090507
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPUTER ARCHITECTURE
AUTOMATION
COMPUTERS
DATA ANALYSIS
DIRECTORIES
FUNCTIONALS
MANAGEMENT
METRICS
NEUTRON SOURCES
NEUTRONS
OPTIMIZATION
ORNL
PERFORMANCE
POSITIONING
SCATTERING
SIMULATION
SPALLATION
DATA BASE MANAGEMENT
Portal
software
scientific computing
data
data management
user facility
thick client
service oriented architechture