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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 109 records · Page 6
All sourcesNASA NTRSDOE OSTI
DOE OSTI2014

Distributed File System Utilities to Manage Large DatasetsVersion 0.5

FileUtils provides a suite of tools to manage large datasets typically created by large parallel MPI applications. They are written in C and use standard POSIX I/Ocalls. The current suite consists of tools to copy, compare, remove, and list. The tools provide dramatic speedup over existing Linux tools, which often run as a single process.

ECP↗
DOE OSTI2013

Ceph Parallel File System Evaluation Report

We used Data Direct Networks’ (DDN) SFA10K as the storage backend during this evaluation. It consists of 200 SAS drives and 280 SATA drives, organized into various RAID levels by two active-active RAID controllers. The exported RAID groups by these controllers are driven by four hosts. Each host has two InfiniBand (IB) QDR connections to the storage backend. We used a single dualport Mellanox connectX IB card per host. By our calculation, this setup can saturate SFA10K’s maximum theoretical throughput (~12 GB/s). Our Ceph testbed employs a collection of testing nodes. These nodes and their roles are summarized in Table 1. In the following discussion, we use “servers”, “osd servers”, “server hosts” interchangeably. We will emphasize with “client” prefix when we want to distinguish it from above. All hosts (client and servers) were configured with Redhat 6.3 and kernel version 3.5.1 initially, and later upgraded to 3.9 (rhl-ceph image), Glibc 2.12 with syncfs support, locally patched. We used the Ceph 0.48 and 0.55 release in the initial tests, upgraded to 0.64 and then to 0.67RC for a final round of tests.

Wang, Feiyi↗
DOE OSTI2017

Final Project Report: Composition and Realization of Source-to-Sink High-Performance Flows: File Systems, Storage, Hosts, LAN and WAN

A number of Department of Energy (DOE) science applications, involving exascale computing systems and large experimental facilities, are expected to generate large volumes of data, in the range of petabytes to exabytes, which will be transported over wide-area networks for the purpose of storage, visualization, and analysis. The objectives of this proposal are to (1) develop and test the component technologies and their synthesis methods to achieve source-to-sink high-performance flows, and (2) develop tools that provide these capabilities through simple interfaces to users and applications. In terms of the former, we propose to develop (1) optimization methods that align and transition multiple storage flows to multiple network flows on multicore, multibus hosts; and (2) edge and long-haul network path realization and maintenance using advanced provisioning methods including OSCARS and OpenFlow. We also propose synthesis methods that combine these individual technologies to compose high-performance flows using a collection of constituent storage-network flows, and realize them across the storage and local network connections as well as long-haul connections. We propose to develop automated user tools that profile the hosts, storage systems, and network connections; compose the source-to-sink complex flows; and set up and maintain the needed network connections.

97 MATHEMATICS AND COMPUTING↗
NASA NTRS1994

HLLV avionics requirements study and electronic filing system database development

This final report provides a summary of achievements and activities performed under Contract NAS8-39215. The contract's objective was to explore a new way of delivering, storing, accessing, and archiving study products and information and to define top level system requirements for Heavy Lift Launch Vehicle (HLLV) avionics that incorporate Vehicle Health Management (VHM). This report includes technical objectives, methods, assumptions, recommendations, sample data, and issues as specified by DPD No. 772, DR-3. The report is organized into two major subsections, one specific to each of the two tasks defined in the Statement of Work: the Index Database Task and the HLLV Avionics Requirements Task. The Index Database Task resulted in the selection and modification of a commercial database software tool to contain the data developed during the HLLV Avionics Requirements Task. All summary information is addressed within each task's section.

Source record↗
DOE OSTI2015

Parallel log structured file system collective buffering to achieve a compact representation of scientific and/or dimensional data

Collective buffering and data pattern solutions are provided for storage, retrieval, and/or analysis of data in a collective parallel processing environment. For example, a method can be provided for data storage in a collective parallel processing environment. The method comprises receiving data to be written for a plurality of collective processes within a collective parallel processing environment, extracting a data pattern for the data to be written for the plurality of collective processes, generating a representation describing the data pattern, and saving the data and the representation.

96 KNOWLEDGE MANAGEMENT AND PRESERVATION↗