[Halld-offline] Jefferson Lab Data Center Maintenance work Jan 2 - 8, 2024

[Alexander Austregesilo]

Dear Colleagues,

Please note this message from JLab Scientific Computing and plan 
accordingly:

> Following the Jefferson Lab shutdown in January 2024, several 
> service-affecting data center changes are scheduled. The work will be 
> begin starting Tuesday Jan 2nd to avoid conflicts with with the beam 
> schedule for physics.
>
>   * The Tape Library will be out of service Tuesday Jan 2nd until
>     Monday, Jan 8th. The library will be modified to add additional
>     tape drive expansion room and a second robotic accessor. Tape
>     storage tools, including jcache and LQCD srm tools, will not be
>     available during that time. Farm jobs requiring files from tape
>     will queue until the library reconfiguration is completed. Farm
>     jobs running from disk will continue to be scheduled.
>   * A single day power outage for compute clusters including the farm
>     and LQCD is being coordinated with Facilities Management during
>     this period. Additional information will follow once a date is fixed.
>   * A Slurm upgrade to the farm is planned during this week. Although
>     Slurm upgrades are typically transparent to user jobs, there is
>     the possibility that the queue of pending jobs will need to be
>     cleared. Additional information about the timing will follow. The
>     Slurm upgrade will add new GPU and CPU scheduling capabilities,
>     patch security issues, and prepare the farm for the AlmaLinux 9
>     upgrade.
>
Happy Holidays,

Alex

-- 
Alexander Austregesilo

Staff Scientist - Experimental Nuclear Physics
Thomas Jefferson National Accelerator Facility
Newport News, VA
aaustreg at jlab.org
(757) 269-6982
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