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News
PBS Scheduling Updated for Broadwell Jobs
21 Dec, 2017
Beginning on December 21, 2017, jobs requesting Broadwell nodes are now scheduled by PBS to run on either Pleiades or Electra, whichever system has enough free nodes. This applies to jobs that request Broadwell nodes using either model=bro or...
Update: Merope is Available
20 Dec, 2017
NAS system administrators have completed maintenance work on Merope. The system is back online and available for use. Original notification Merope will be placed in dedicated time for network changes and system maintenance on Wednesday,...
Update: Pleiades is Available
18 Dec, 2017
The /nobackupp9 filesystem is back online, and Pleiades is now available for all jobs. We apologize for any inconvenience. If you have any questions or concerns, please send email to support@nas.nasa.gov or call 1-800-331-8737 or 1-650-604-4444. ...
Brief NAS Network Outages on Dec. 27
15 Dec, 2017
On December 27, 2017, the NAS Network Team will perform network maintenance that will briefly affect all internet communications between remote systems and NAS systems. We expect there will be two interruptions between 5:00–7:00 p.m., each lasting...
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...
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