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If your files are available on another site in the grid, let's say CERN or GridKa, you can access them via grid protocols as gridftp or xrootd over the internet/WAN.


If you start 1000s of jobs on the NAF and each reads a file over WAN there is the good chance, that you will

  • saturate the in/outgoing network connection to the internet
  • overload the remote storage

→ you will cause a distributed denial of service attack on shared resources.

And as a result numerous local and remote network admins will try to track you down to stop you.

Advice: if you plan to access file on remote storage elements, use the file transport infrastructure of your experiment to copy these files to your local scratch space in an organized way.

Cat5 o' Nine Tails

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