Messages & Announcements

  • 2018-03-16:  Crane /work filesystem downtime resolved
    Category:  General Announcement

    The /work filesystem for Crane is restored as of 2:50pm.

    One of the storage servers crashed and rebooted. A filesystem check was completed with no errors found. Running jobs which were accessing /work stalled until the filesystem was restored. This may have caused jobs to exceed their time limit. There was no data loss from this outage.

    We believe the storage server crash was triggered by I/O delays as the RAID controller was rebuilding a failed disk drive. The rebuild is still running and we are monitoring the system.


  • 2018-03-16:  Crane /work filesystem unplanned downtime
    Category:  System Failure

    The /work filesystem for Crane is partially unavailable. One of the storage servers crashed and rebooted. We are now running a filesystem check before placing the server back online. Pending jobs will be held until the maintenance is complete.


  • 2018-03-07:  HCC XDMoD downtime 3/8/18
    Category:  Maintenance

    The HCC XDMoD instance (hcc-xdmod.unl.edu) will be unavailable Thurs., March 8 2018 beginning at 11am CST for maintenance. During this time, the website will be unavailable. Maintenance is expected to last approximately one hour. If you have any questions or concerns, contact hcc-support@unl.edu.


    The HCC XDMoD instance (hcc-xdmod.unl.edu) will be unavailable Thurs., March 8 2018 beginning at 11am CST for maintenance. During this time, the website will be unavailable. Maintenance is expected to last approximately one hour. If you have any questions or concerns, contact hcc-support@unl.edu.

  • 2018-01-04:  HCC Unscheduled Maintenance complete
    Category:  General Announcement

    Unscheduled maintenance has been completed on the Crane, Sandhills and Tusker clusters. Please let us know of any troubles using the clusters by sending email to hcc-support@unl.edu

    More details on the maintenance can be found at https://hcc.unl.edu/messages-announcements?idmessages=265


  • 2018-01-03:  Impending Shutdown
    Category:  Maintenance

    A significant kernel side-channel attack vulnerability has been identified; patches should be available soon. Users should be aware that once patches are available, it will be necessary to take machines down to patch this significant security vulnerability. This includes Crane and Anvil, and possibly Tusker and Sandhills. We anticipate this maintenance will happen as soon as tomorrow morning.

    More details will be sent as they become available.

    Happy New Year ...
    David Swanson


    HCC clusters went down earlier this afternoon for unscheduled maintenance to address a security flaw in the Intel-based processors found in Crane and Anvil. This newly patched kernel, which also addresses other security vulnerabilities, was applied to Tusker and Sandhills as well.

    We realize an unexpected shutdown is never preferred, but since classes start next week and all clusters were subject to well-known exploits, it was not possible to give more notice. We ourselves were waiting on the release of a patched kernel, which was fortunately released days earlier than originally anticipated.

    All jobs that were killed will be rescheduled. This patch may cause performance degradation on Intel processors (Crane, Anvil). Please let us know asap if you notice a significant slowing of your application, and we will work to mitigate this wherever possible.

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