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.
Figure 1. NEX Components and User Tiers
Pleiades733 TB total
Current Statistics - NEX "nobackup" allocation is under Nbp4
Sandboxeslnxsrv87: 123 TB total
lnxsrv105: 123 TB total
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.
Other, NEX Facts - 1 year, 2 months ago
Other, NEX Facts - 7 months, 1 week ago
This page describes the datasets currently available on the NEX computing platform that are available to NEX science users. LANDSAT Landsat 5 and Landsat 7 ...
Other, NEX Facts - 11 months, 4 weeks ago
Apart from a number of custom tools and capabilities that are currently being integrated into the NEX science platform, the following is a subset of ...
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