Infrastructure:

• FNAL: Had some downtime due xrootd being off on one data server. Caused clients to get dreaded 84 error.
• Monitoring had downtime due to expired proxy.
• Frontend at UCSD is down. Waiting for new hardware - can turn it back on in the VM, but might have to shut it off again at any given time. Likely in the next 2 weeks (possibly in the next few days).
• Production redirector had hostcert expire.
• Gratia went down due to unrelated OOM issues.
• Matevz's collector has held up.
• Florida had issues with Lustre, but Xrootd responded correctly.

Software:

• Dan has been working on the read-ahead patch for the XrdHdfs plugin. Being tested in Wisconsin and lightly at Nebraska.
  • IOPS to HDFS halves.
  • Re-use of bytes in the buffer is about 10%.
  • Brian: What percentage of "useless" bytes?
• Dan: Been looking at the CVMFS design. Might be useful regardless locally for $OSG_APP. Not looking at the code yet.
  • Igor: How would you handle "committing" file modifications to the file tree to make them available? Dan: Might be a lot of concurrency/race issues here to have a "cronjob" do the updates for us.
  • Brian: Might want to think about doing a FUSE-emulation layer for Parrot.
• Brian: Summary of Xrootd meeting (will put a pointer to slides)

AOB:

• Ken: Can we do an update at the T2 meeting?
  • Brian: Would be nice to have Matevz do it, but don't want to volunteer him when he's on vacation. Dan will be backup if Matevz is unable.
  • Topics: Job Overflow and monitoring
• Igor: Student we were hoping to use to look at data placement has disappeared; will have to find a new one. UCSD has candidate for job position; might free up Igor/Jeff/Matevz's time.
• Brian: At the end-stages of hiring new personnel.
• Dan: Got a new student working on Parrot and CMSSW.