Site Support Team - Documentation
CompOps Systems Background Information


  • What is BDII, where who puts the info?
    • Every CE


  • How does CRAB submits jobs only through SEs?
    • CRAB populates the .jdl file (instructions for the jobs) with the SEs
    • Then the glidein factories match the SE to the site name and the corresponding CEs according to the list the factories keep (manual configuration)


  • Does phedex use only phedex node name?
    • Node names and SE list - phedex table is the most reliable source

  • How does Phedex get the SEs list?
    • From TFC files of every site.

  • If a site upgrades to SL6 how to update Phedex?
    • PhEDEx is not distributed through CVMFS, you need to install and configure the PhEDEx agents manually.
    • You can find the instructions for SLC6 here: LINK


  • How does SAM work?
    • presently:   SAM jobs --> glite WMS (reads info || submits through condor) --> Sites
      future plan: SAM jobs (condor_g plugin) -directly-> Sites
    • SAM tests use glite WMS instead of glidein WMS because glideins use pilots and in that scheme we can't test the CE.
    • glite WMS has two parts, first reads the info from the job (SEs, CEs, etc) and 2nd it submits through condor.
    • glite generates more problems because is a push system (we can't guarantee that a job will execute in case of failure at the site) while glideins are a pull system (only successful pilots will pull jobs).
    • The plan is to remove the glite WMS, but before that can happen we need a condor_g plugin for glite. We don't need the intermediate state of the gliteWMS to read the info and submit the job. The job already has all the info, we just need the plugin for the job submitter to be able to submit directly through condor to all sites.
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Topic revision: r3 - 2013-10-22 - JohnArtieda
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