Access to data at NIKHEF tier

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There are maybe multiple ways to access data on the LCG. Though the two methods explained here are via LFC (LCG File Catalog) and SRM (Storage Resource Management). I'm just documenting what I didn't know. So please, correct things if they are wrong!

  • LFC is a file catalog at a Grid site that stores the information on which site a file can be found. This means, for example, that a file registered in the NIKHEF LFC, might be stored for at a CERN SE (Storage Element).
  • SRM is a procotol that enables file access only at a specific SE.

NOTE: For all this a Grid certificate [1] is required.

LFC

Everytime you start a new session, you need to setup the environment for Grid access: 

source /global/ices/lcg/current/etc/profile.d/grid_env.csh


DPM/DPNS/SRM

Disk Pool Manager 

setenv DPM_HOST tbn18.nikhef.nl
setenv DPNS_HOST tbn18.nikhef.nl

dpns-ls -l /dpm/nikhef.nl/home/atlas/MYFILE

srmcp srm://tbn18.nikhef.nl:8443/dpm/nikhef.nl/home/atlas/MYFILE file:////tmp/MYFILE

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