• Post-DC24 test @RAL:
  • GGUS-165529
    • T0-T1 test repetition (RAL-LCG2); in progress.
    • Test went ahead on 18 March around 13:30 hrs (UK time).
    • During the first 2-3 hours, the traffic was regular and writing happened at a rate of 28.6 Gb/s.
    • FTS parameters were changed to achieve the desired rate (44 Gb/s), but the rates went down.
    • Concerning deletions: 
      • The tape is not like disk and files are not actually deleted but their id in the catalogue is. 
      • The degradation due to deletions is an artefact of how the test is run, not of the performance of the tape system.
      • The files can't simply be overwritten -- this was not realised before the test.
      • Enough space is needed on 20 March for at least about 6 hours to avoid this to happen. 
    • Asked of RAL: observation about tape rates, deletion and network 13:40 and 17:00 UTC to be posted on the ticket.
  • Monit-grafana link:
    • There were deletion "failures", but no deletion error was found! 
      

 

• lcg2483.gripp.ac.uk
  • RAL-LCG2_TEST -- 
    
    • Things are fairly good -- HammerCloud tests look good. 
      
    • Job Accounting link.
    • The workernode link.

 

• New tape family discussions: STAH-76.