• Smooth operations of Tier-1 services with the exception of network performance problems on the primary OPN circuit between BNL and CERN
  • Unnoticed between April 6 and April 25
    • perfSONAR plots clearly show the problem
    • Brought up at yesterday's ESnet site coordinator meeting
      • ESnet CTO suggested to have ESnet engineers work with Shawn on monitoring improvements
  • Connectivity (via BGP session) maintained over the entire period
  • Throughput significantly impaired leading to job completion delays
  • Switching to secondary OPN circuit solved the problem
    • ESnet engineering investigated the circuit and found packet loss caused by components close to the Virginia landing point
  • Another OPN network performance issue was reported for transfers from BNL to SARA
    • Independent from the BNL - CERN issue
• PO for ~7.5 PB (usable) of magnetic disk arrived at vendor (RAID Inc)
  • Expect delivery in ~4 weeks