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.
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Topic revision: r1 - 2011-11-29 - BrianBockelman
 
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