NASA Scientific and Technical Aerospace Reports

clusters with usually small IT budgets, it is important that the storage system ‘just work’ with relatively little administrative
overhead.
Author
Unix (Operating System); Bandwidth; Data Storage; Object-Oriented Programming
20040121042 Sandia National Labs., Albuquerque, NM, USA
The Data Services Archive
Haynes, Rena A.; Johnson, Wilbur R.; NASA/IEEE MSST 2004 Twelfth NASA Goddard Conference on Mass Storage
Systems and Technologies in cooperation with the Twenty-First IEEE Conference on Mass Storage Systems and Technologies;
April 2004, pp. 261-271; In English; See also 20040121020
Contract(s)/Grant(s): DE-AC04-94AL-85000; No Copyright; Avail: CASI; A03, Hardcopy
As access to multi-teraflop platforms has become more available in the Department of Energy Advanced Simulation
Computing (ASCI) environment, large-scale simulations are generating terabytes of data that may be located remotely to the
site where the data will be archived. This paper describes the Data Service Archive (DSA), a service oriented capability for
simplifying and optimizing the distributed archive activity. The DSA is a distributed application that uses Grid components
to allocate, coordinate, and monitor operations required for archiving large datasets. Additional DSA components provide
optimization and resource management of striped tape storage.
Author
Computer Systems Simulation; Data Integration; Distributed Processing; Data Transfer (Computers); Massively Parallel
Processors
20040121044 Illinois Univ., Chicago, IL, USA
Using DataSpace to Support Long-Term Stewardship of Remote and Distributed Data
Grossman, Robert L.; Hanley, Dave; Hong, Xin-Wei; Krishnaswamy, Parthasarathy; NASA/IEEE MSST 2004 Twelfth NASA
Goddard Conference on Mass Storage Systems and Technologies in cooperation with the Twenty-First IEEE Conference on
Mass Storage Systems and Technologies; April 2004, pp. 239-243; In English; See also 20040121020; No Copyright; Avail:
CASI; A01, Hardcopy
In this note, we introduce DataSpace Archives. DataSpace Archives are built on top of DataSpace s DSTP servers and
are designed not only to provide a long term archiving of data, but also to enable the archived data to be discovered, explored,
integrated and mined. DataSpace Archives are based upon web services. Web services UDDI and WSDL mechanisms provide
a simple means for any web service client to discover relevant archived data . In addition, data in DataSpace Archives can
carry a variety of XML metadata, and the DSTP servers which underly the DataSpace Archives provide direct access to this
metadata. Unfortunately, web services today do not provide the scalabilty required to work with large remote data sets. For
this reason, DataSpace Archives employ a scalable web service we have developed called SOAP+.
Author
Metadata; Data Storage; Data Transfer (Computers)
20040121045 Deutsches Elektronen-Synchrotron, Hamburg, Germany
dCache, the Commodity Cache
Fuhrmann, Patrick; NASA/IEEE MSST 2004 Twelfth NASA Goddard Conference on Mass Storage Systems and Technologies
in cooperation with the Twenty-First IEEE Conference on Mass Storage Systems and Technologies; April 2004, pp. 171-175;
In English; See also 20040121020; No Copyright; Avail: CASI; A01, Hardcopy
The software package presented within this paper has proven to be capable of managing the storage and exchange of
several hundreds of terabytes of data, transparently distributed among dozens of disk storage nodes. One of the key design
features of the dCache is that although the location and multiplicity of the data is autonomously determined by the system,
based on configuration, cpu load and disk space, the name space is uniquely represented within a single file system tree. The
system has shown to significantly improve the efficiency of connected tape storage systems, through caching, gather & flush
and scheduled staging techniques. Furthermore, it optimizes the throughput to and from data clients as well as smoothing the
load of the connected disk storage nodes by dynamically replicating datasets on the detection of load hot spots. The system
is tolerant against failures of its data servers which enables administrators to go for commodity disk storage components.
Access to the data is provided by various ftp dialects, including gridftp, as well as by a native protocol, offering regular file
system operations like open/read/write/seek/stat/close. Furthermore the software is coming with an implementation of the
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