Accessing Data

To access data one of the following methods can be used:

  1. For crab jobs set ignoreLocality flag to true in the config file (Read more about CRAB3 Configuration File)
  2. For interactive access to files use:
    root://cms-xrd-global.cern.ch/<LFN>       
    For example:
    root -l root://cms-xrd-global.cern.ch//store/express/Commissioning2016/StreamExpressCosmics/ALCARECO/TkAlCosmics0T-Express-v1/000/266/150/00000/008C1D7E-D9E4-E511-A6C0-02163E01460B.root      
  3. In a cmsRun job an LFNs needs to be specified.

Data Exploration

For data exploration, DAS can be used:

  1. To check what datasets are available for a given run:
    https://cmsweb.cern.ch/das/request?view=list&limit=50&instance=prod%2Fglobal&input=dataset+run%3D266150    
    This is equivalent to go the the DAS Web Interface and query
     dataset run=266150 
  2. To get a list of files for a given dataset for a given run:
     https://cmsweb.cern.ch/das/request?view=list&instance=prod%2Fglobal&input=file+dataset%3D%2FStreamExpressCosmics%2FCommissioning2016-TkAlCosmics0T-Express-v1%2FALCARECO+run%3D+266150 
    This is equivalent to go the the DAS Web Interface and query
    file dataset=/StreamExpressCosmics/Commissioning2016-TkAlCosmics0T-Express-v1/ALCARECO run=266150 
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Topic revision: r1 - 2016-03-09 - JohnHarveyCasallasLeon
 
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