NEX FACTS 7/24/2013

  • NEX Goal
  • NEX User Tiers
  • Current NEX Data Holdings
  • Models available on NEX
  • Tools and Libraries available on NEX
  • Disk Storage Space
  • Computing Hours Available
  • NEX Goal

    The goal of the NASA Earth Exchange (NEX) is to enable enhanced and more efficient use of Earth observations for NASA Earth science technology, research and applications programs. NEX is a collaborative compute platform that improves the availability of Earth science data, models, analysis tools and scientific results through a centralized environment that fosters knowledge sharing, collaboration, innovation and direct access to compute resources.

    NEX User Tiers

    The NEX components (represented conceptually in Figure 1) include a web portal, prototyping sandbox and assets within the NASA Advanced Supercomputing (NAS) High-Performance Computing (HPC) environment. There are three principal user tiers with different access to resources:

    Earth Science Community Users

    The Earth Science Community Users have access to the web portal and all the associated collaboration and social networking tools.

    NEX Science Users

    The NEX Science Users have access to the web portal and the prototyping sandbox, which includes NEX tools and small sample of the datasets.

    NEX HPC Users

    The NEX HPC Users have access to all the components including the complete NEX data holdings and supercomputing resources.

    image here Figure 1. NEX Components and User Tiers

    Current NEX Data Holdings

    Click here for the list of available datasets

    Models available on NEX

    Click here for the list of available models

    Tools and Libraries available on NEX

    Click here for available tools and libraries.

    Disk Storage Space

    Pleiades

    733 TB total
    Current Statistics - NEX "nobackup" allocation is under Nbp4

    Sandboxes

    lnxsrv87: 123 TB total
    lnxsrv105: 123 TB total

    Computing Hours Available

    On Pleiades, PBS (version 10.4) is used to manage batch jobs that run on the compute nodes (4 different processor types, 11,136 nodes, 162,496 cores in total). The accounting unit is the Standard Billing Unit (SBU). The SBUs charged to a PBS job running on the compute node(s) is:
    SBU charged = Wall_Clock_Hours_Used * Number of MAUs * SBU Rate
    where the MAU represents the minimum allocatable unit of resources available through PBS. NEX has 472,465 SBUs available as of 12/3/2013.

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    Started: Aug 20, 2012

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