Daily Bulletin Archive

Apr. 2, 2018

Cheyenne system administrators will perform important maintenance procedures on PBS today beginning at noon MDT. The maintenance is expected to take approximately one hour to complete.

Most PBS commands will not work during the maintenance outage, including qstat and qsub, and new job submissions will not be possible. Access to Cheyenne’s login nodes will not be interrupted.

No batch jobs are expected to be lost as a result of the maintenance.  Jobs that are executing when the maintenance begins will continue to run without interruption. Jobs that are queued for execution or in a hold state will remain in those states until PBS is returned to service.

 

Users will be notified when PBS is returned to service.

Apr. 2, 2018

Users of the NCAR/CISL High Performance Storage System (HPSS) whose storage allocations are overspent as of Monday, April 2, will receive error messages when they try to write files to that system and those transfers will fail. Once an allocation is overspent, users will need to reduce their holdings before they can write additional files. Some users may need to modify their workflows to ensure that archive space is available, detect error messages, and confirm execution of transfers to HPSS.

To check the status of your HPSS allocation, log in to the Systems Accounting Manager (sam.ucar.edu) and select Reports, then My Account Statements. The accounting statements are updated weekly, so the most recent writes or deletions may not be reflected until several days after they are made.

Additional details and guidance will be available soon.

Mar. 31, 2018

The application deadline for the Women in IT Networking at SC (WINS) program has been extended to March 31. Awardees will receive funding to participate as SCinet team members during the SC18 conference in November in Dallas, Texas. Interested and qualified women are encouraged to apply.

See the WINS site for more information and a link to the application. WINS is a three year National Science Foundation-funded program that awards up to five early to mid-career women from diverse regions of the U.S. research and education community IT field to participate in the ground-up construction of SCinet, one of the fastest and most advanced computer networks in the world. WINS is a joint effort between the Energy Sciences Network (ESnet), the Keystone Initiative for Network Based Education and Research (KINBER), and the University Corporation for Atmospheric Research (UCAR).

Mar. 30, 2018

The PBS qstat command will be modified during this week's maintenance outage. When Cheyenne is returned to service late this week users will be able to query only for information about their own jobs and not jobs submitted by other users. The reason for this change is to reduce demands on the PBS server, which has frequently been overloaded, resulting in poor system performance and job failures. User should be aware that this change may affect some existing scripts and workflow managers.

CISL learned recently that some users’ scripts were issuing multiple qstat commands, which can be highly resource intensive, every minute or every second. Limiting qstat to return information only for jobs belonging to the user will significantly reduce demands on the system. Before this change, the command’s default behavior was to return information on all jobs in the PBS database.

Users can further help reduce demands on the system by adopting the following changes wherever possible:

  • Use “qstat <jobid>” instead of just “qstat”

  • Avoid using “qstat -f -x”

  • Limit the number and frequency of qstat commands. Multiple calls every minute provides little extra information and adversely affects overall system performance.

CISL thanks all users for their cooperation. Please contact cislhelp@ucar.edu if you have any questions or would like help in this matter.

Mar. 26, 2018

CISL is now accepting requests from university-based researchers for large-scale allocations for the 5.34-petaflops Cheyenne cluster; submissions are due March 26.

You should be aware that the CHAP is scrutinizing requests for disk and tape storage much more closely  because of the rapidly growing scale of the data generated by many university projects and constraints on the available storage within the CISL environment. Be sure to review the guidance on the updated instruction page before preparing your submission.

Large allocations on Cheyenne are those of more than 400,000 core-hours. CISL accepts requests from university researchers for these large-scale allocations every six months. For updated submission instructions and information regarding available resources, see the CISL HPC Allocations Panel (CHAP) page.

Please contact cislhelp@ucar.edu if you have any questions about this opportunity.

Mar. 26, 2018

No downtime: Cheyenne, GLADE, Geyser_Caldera and HPSS

Mar. 25, 2018

IBM engineers and CISL system administrators crossed a significant hurdle yesterday, March 22, by successfully recovering missing disk drives on the /glade/p file system.   The recovered disks had been unreachable since the hardware component failure on March 8 causing errors when reading many /glade/p files.

A full file system check was performed overnight night to verify data, locate any file corruption and generate a report for IBM that will be reviewed this morning.  Pending the outcome of that review a full repair of the file system may be initiated that will keep all of /glade/p offline throughout the day.

Users will be kept up to date on all developments through the Notifier service.

Mar. 23, 2018

The Women in IT Networking at SC (WINS) program is now accepting applications for the 2018 program. Awardees will receive funding to participate as SCinet team members during the SC18 conference in November in Dallas, Texas. Interested and qualified women are encouraged to apply.

The application deadline is March 23. See the WINS site for more information and a link to the application. WINS is a three year National Science Foundation-funded program that awards up to five early to mid-career women from diverse regions of the U.S. research and education community IT field to participate in the ground-up construction of SCinet, one of the fastest and most advanced computer networks in the world. WINS is a joint effort between the Energy Sciences Network (ESnet), the Keystone Initiative for Network Based Education and Research (KINBER), and the University Corporation for Atmospheric Research (UCAR).

Mar. 22, 2018

The High Performance Storage System (HPSS), which CISL uses to manage its tape archive, doesn’t have a built-in way to enforce quotas, so the CISL Systems Accounting Manager (SAM) supports that new feature. HPSS reports summary weekly storage holdings to SAM by user and project, then SAM reports to HPSS which projects have overspent their allocations. HPSS accounting happens only once a week, so users should be aware of when changes actually take effect.

For example, a user whose storage allocation is overspent might delete enough files on a Thursday or Friday to be under the allocation limit, but the weekly HPSS accounting run is done each Sunday. Changes in the project’s HPSS holdings then are updated in SAM on Monday. At that point, the system recognizes that the allocation is no longer overspent and it restores the user’s ability to write files to HPSS. The actual tape capacity that was freed up is reclaimed later on.

Requests for occasional short-term (one week) exceptions to allocation limit enforcement to compensate for the accounting time delay should be sent to cislhelp@ucar.edu for consideration.

Mar. 19, 2018

No downtime: Cheyenne, HPSS, Geyser_Caldera.

Work continues on GLADE P

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