Messages & Announcements

  • 2012-07-31:  PrairieFire retirement and Sandhills reconfiguration
    Category:  General Announcement

    PrairieFire and SandHills require a shutdown for substantial changes in two weeks (Aug. 14). Several significant improvements are planned: the OS will be upgraded, the Maui/torque scheduler will be replaced, and the 2 systems will be fully merged with the name "prairiefire" retired. Existing binaries and scripts may work immediately; some may require recompiling or editing. Updated FAQs will be available before these changes are enacted. If you have any concerns, please contact hcc-support@unl.edu.


    Several clusters sharing the name "PrairieFire" have served us well over the last 9 years, but, as announced at various user meetings last spring, the name will soon go into a well-earned retirement. August 14th the newer cluster SandHills, already sharing several components with PrairieFire, and the parts of PrairieFire that remain useful, will be merged into a single system. After August 14th prairiefire will no longer be maintained as a separate resource. This will coincide with several other important changes.

    The operating system is overdue for an upgrade; it will be updated to SL6.2 (equivalent to RHEL6). We will also be implementing the SLURM resource manager in place of TORQUE/Maui. Existing TORQUE submit scripts will run with minimal changes. FAQs will be updated on the HCC website soon. While existing executables will likely run, recompiling may be required. The current scheduling stack's failings have been mitigated by vigilance and a growing list of ad hoc solutions. SLURM (https://computing.llnl.gov/linux/slurm/overview.html) promises to improve this situation considerably, based upon our test implementation and the experience of LLNL and other prominent users. All filesystems will be unaffected by this change; they were already integrated previously.

    While these changes are necessary, even a successful upgrade can result in unexpected effects. Please contact us immediately if you encounter any trouble, and we'll work to make the transition as smooth as possible.

  • 2012-06-26:  Tusker downtime, July 2, 10am-noon
    Category:  Maintenance

    On Monday, July 2, from 10am to noon, Tusker will be unavailable in order to perform maintenance on the /home filesystem.

    No running jobs should be affected, but jobs may be delayed in the three days leading up to the maintenance window. Any jobs which cannot complete before the maintenance window will be held until work is complete.


    On Monday, July 2, from 10am to noon, Tusker will be unavailable in order to perform maintenance on the /home filesystem.

    No running jobs should be affected, but jobs may be delayed in the three days leading up to the maintenance window. Any jobs which cannot complete before the maintenance window will be held until work is complete.

  • 2012-06-15:  PRAIRIEFIRE: Unplanned outage
    Category:  System Failure

    The /util network filesystem crashed and had to be restarted this morning. If you had jobs running on PRAIRIEFIRE please log on and check to see if they need to be resubmitted.


    The /util network filesystem crashed and had to be restarted this morning. If you had jobs running on PRAIRIEFIRE please log on and check to see if they need to be resubmitted.

  • 2012-05-29:  Farewell, Merritt
    Category:  General Announcement

    Merritt has served the HCC community well for the last several years. It's going off line for good at 12 o'clock noon, May 31st.


    This retirement was announced earlier this month (http://hcc.unl.edu/hcccreditedit/messages.php?idmessages=78).
    If you need access to data from Merritt, please contact HCC staff
    (hcc-support@unl.edu).

  • 2012-05-03:  Merritt Retired; no further access
    Category:  General Announcement

    Merritt, a shared memory machine from SGI, has suffered a hardware failure that reduces its capability by 50%. Since all of the Tusker nodes have as much RAM space as Merritt in this condition, we are retiring Merritt immediately. If you have a pressing need to access Merritt, please contact hcc-support@unl.edu asap. We plan to unplug it by May 15, 2012.


    Merritt has been slated for retirement at the next significant hardware failure for some time. That next failure has occurred.

    Data will be backed up elsewhere, and was not lost as a result of this failure. No login is available at this time. If users need access, you must contact HCC immediately (hcc-support@unl.edu). 2 nodes of tusker have 512 GB RAM; 104 have 256 GB RAM. Sandhills also has a node with 256 GB RAM. HCC staff will be available to help to port code to these other more current resources as needed.

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