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News
Results of 2017 User Survey Now Available
30 Nov, 2017
In 2017, 346 users participated in a user survey that addressed twelve NAS service areas. This report provides a summary of the survey results and information on related activities undertaken over the last year to improve performance in several key...
Training Materials for "Memory Usage on NAS Xeon-Based Systems" Now Available
13 Nov, 2017
Training materials are now available for the webinar "Memory Usage on NAS Xeon-Based Systems," which was held on Wednesday, November 8, 2017. You can download a PDF of the slides presented, and follow along with an accompanying MPEG file of the...
Electra Expanded with Intel Skylake Nodes
27 Oct, 2017
In September, Electra was expanded with the addition of 1,152 Intel Xeon Gold 6148 "Skylake" nodes. This expansion brings Electra's theoretical peak performance to 4.79—more than half that of Pleiades. After extensive testing by NAS teams and a...
Training Materials for "Using IOT for I/O and MPI Performance Analysis" Now Available
12 Sep, 2017
Training materials are now available for the webinar "Using IOT for I/O and MPI Performance Analysis," which was held on Wednesday, September 6, 2017. You can download a PDF of the slides presented, and follow along with an accompanying MPEG file...
Training Materials for "Using OpenMP 4.0 on Pleiades" Now Available
31 Jul, 2017
Training materials are now available for the webinar "Using OpenMP 4.0 on Pleiades," which was held on Wednesday, July 26, 2017. You can download a PDF of the slides presented, and follow along with an accompanying MPEG file of the recorded audio...
Pleiades and Electra Operating Systems Upgraded to SLES 12
28 Jun, 2017
On June 28, 2017, all of the Pleiades and Electra compute nodes and five front-end systems (pfe21–25) were upgraded to SUSE Linux Enterprise Server 12 Service Pack 2 (SLES 12 SP2) as the default operating system. You might need to change the way...
Change to Default Stripe Count on Lustre Filesystems
22 Jun, 2017
The default stripe count has been changed from 1 to 4 on all Pleiades Lustre filesystems. This change will improve read/write performance for most file access methods, and balance the load across the available servers. It will also mitigate the...
pbs_release_nodes Command Now Available on Pleiades, Electra, and Merope
16 May, 2017
The pbs_release_nodes command, which was previously available only on Merope, is now available on Pleiades and Electra. This PBS command enables you to release nodes from a running job when it is beneficial to do so—for example, when most nodes in...
Quota Enforcement Resumed on /nobackup Filesystems
09 Feb, 2017
Enforcement of hard quota limits that had been turned off for the Lustre /nobackup filesystems was resumed on February 8, 2017, with a different mechanism. Quota limits were turned off for several months due to software bugs that were causing...
Electra In Production January 1, 2017
01 Jan, 2017
Electra is a 1.2-petaflop system housed in a module outside of the main NAS building. It has 16 Broadwell racks, each containing 72 nodes. Each node contains two 14-core E5-2680v4 (2.4 GHz) processor chips and 128 GB of memory. Electra was ranked...
Removal of Older Versions of Apache Subversion
29 Nov, 2016
The NAS Subversion server is being updated to improve security. This change causes older versions of the Subversion software to fail to connect to the NAS Subversion server. Therefore, the OS-supplied version (/usr/bin/svn) and the older versions...
SMD Computing Time Requests Exceed Capacity
07 Nov, 2016
Continuing a multi-year trend, Science Mission Directorate (SMD) computing time requests far exceeded capacity at both the NASA Advanced Supercomputing (NAS) Facility and the NASA Center for Climate Simulation (NCCS). As a result many Principal...
New NAS MATLAB License Usage Policy
31 Oct, 2016
Effective immediately, we have implemented a new policy to better manage the limited number of NAS MATLAB licenses. In summary: Each user is limited to a single interactive MATLAB license. When using the MATLAB GUI, after 4 hours of being idle...
Training Materials from the NAS User Webinar, "Getting a NAS Account" Now Available
18 Oct, 2016
The training materials from the user webinar "Getting a NAS Account," held Wednesday, October 19, 2016, are now available in the Past Webinars Archive. This webinar covers the steps required for Principal Investigators (PI) and new users in...
Update: NAS Systems Back in Production
11 Oct, 2016
Pleiades, Endeavour, Merope, Lou, and the Lustre filesystems are online and available. We apologize for any inconvenience, and thank you for your patience. If you have any questions or concerns, please contact the Control Room at (800) 331-8737,...
Bridge Nodes Were Removed on Sept. 8
08 Sep, 2016
The bridge nodes (bridge[1-4]) were retired September 8, 2016 at noon (Pacific Time) to improve stability of the InfiniBand fabric. With the bridge nodes no longer available, you will need to use the PFE hosts to access Pleiades and Endeavour....
Results of 2015 User Survey Now Available
20 Jul, 2016
In 2015, 314 users participated in a user survey that addressed 12 NAS service areas. This report provides a summary of the survey results and information on related activities undertaken over the last year to improve performance in several key...
Additional 14 Broadwell Racks Incorporated into Pleiades
05 Jul, 2016
Another 14 racks containing Intel Broadwell processors were incorporated into Pleiades on July 1, bringing the total number of Broadwell racks to 28 and increasing the system's theoretical peak performance from 6.28 to 7.25 petaflops. Pleiades is...
Important Changes to Running MATLAB in Batch Jobs
22 Jun, 2016
On Pleiades and Merope, PBS batch jobs are no longer allowed to query the license server for MATLAB licenses. This change prevents multi-node PBS batch jobs from querying the license server from multiple nodes simultaneously, which can overwhelm...
Training Materials from Recent Webinars Now Available
21 Jun, 2016
Training materials from the following web-based user training sessions are now available in the Past Webinars Archive: Simplifying and Optimizing Your Data Transfers (slides and video) Performance Evaluation of Pleiades Broadwell Nodes Using...
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