[Halld-offline] Planned Outage of farm, ifarm, and storage: Monday, August 19th 9:00am to Wednesday, August 21st 9:00am

[Alexander Austregesilo]

Dear Colleagues,

Please remember the planned outage of farm, ifarm, and storage from 
Monday, August 19th 9:00am to Wednesday, August 21st 9:00am. The farm, 
ifarm, SWIF, Globus, tape storage, and Lustre storage (/cache and 
/volatile) will be offline during this time window to transition to a 
new Lustre parallel filesystem. Farm nodes are reserved starting August 
19th at 9:00am. Farm jobs that are scheduled to run during this period 
will be queued until the work has been completed. Files stored in /cache 
and /volatile will be copied to the filesystem with the following caveats:

*    If the final filesystem synchronization runs long, it will be 
stopped at 9:00am on August 21. Any uncopied files will be limited to 
those written in the days just before the upgrade. /lustre19 will be 
maintained as an offline backup for at least one month.
*    The /lustre19 path will not be valid after the change. Please use 
/cache and /volatile in absolute paths to files.
*    As a reminder, an outage for this transition was scheduled because 
of a limitation in older hardware that prevents from running both Lustre 
filesystems simultaneously.

Steps to help facilitate a speedy Lustre transition on August 19th:

*    Consolidate or delete small files on Lustre if possible
*    Limit directly writing large file sets to /cache or /volatile the 
weekend before the upgrade. This will help to keep the final file system 
synchronization from running long.
*    Important Note: Using jcache is not a concern because jcache 
requests are written to both the old and new Lustre filesystems.

Best regards,

Alex

-- 
Alexander Austregesilo

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