•  Vector read status:
  • New patch was developed and applied on lcg2270. With several features:
    • atomic cache reads
    • caching layer
    • timeout increase for readv operations
    • async read operations disabled
  • So far looks good, but only 11 user jobs were executed there.
  • Old patch has the following results: 5 user jobs failed due to read erros, 792 user jobs executed successfully (0.6 percent failure rate). On the whole farm failure rate was approximately 1.7 percent for the same time period.
• Dark data
  • Size of the dark data was identified, it is 877TB
  • Discussion is ongoing how to delete this data, it may be better to do it from the site's side
• DNS issue
  • Reappeared last Sunday, affected LHCb significantly
• Upload Failures
  • Multiple peaks of failed uploads since yesterday afternoon, seems to be related to the gateway overload
• Low number of running jobs
  • The number of running LHCb jobs was low throughout the weekend, due to fs tuning
  • Recovered now