LFC Practical

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LHC Computing Grid i LCG File Catalog

  • In order to work with LFC user need to set environmental variables
    • $LFC_HOST (address of LFC server)
    • $LCG_CATALOG_TYPE (catalog type)
  • You can check whether variables are set with :
    • echo $LFC_HOST
    • echo $LCG_CATALOG_TYPE
  • If variables are not set, user can define them with:
    • export LFC_HOST=grid02.rcub.bg.ac.rs
    • export LCG_CATALOG_TYPE=lfc
  • User can get list of available LFC server with command:
    • lcg-infosites --vo sgdemo lfc
  • You can also list available SE,CE ...
  • User must make proxy for appropriate organization

Useful commands :

  • lcg-cr – copies file to SE and register in catalog
  • lcg-cp – copies file from grid to local destination
  • lcg-del – delete one file from grid
  • lcg-rep – makes file replica on other SE
  • lcg-aa – makes new alias (new LFN) in catalog for given GUID or existing LFN
  • lcg-ra – delete existing alias for given GUID
  • lcg-rf – register existing file on SE into catalog
  • lcg-uf – delete register info of file on SE from catalog
  • lcg-la – LFN prints out all aliases for given SURL, GUID or LFN
  • lcg-lg – prints out GUID for given LFN or SURL
  • lcg-lr – prints out all replicas for given GUID, SURL or LFN
  • lfc-mkdir – create new directory in catalog
  • lfc-chmod – changes permissions for using a file or directory
  • lfc-chown – changes owner of file or directory
  • lfc-setcomment – adds comment on file
  • lfc-delcomment – deletes comment
  • lfc-ln -s – creates symbolic link on file/directory
  • lfc-ls – lists content of given file or directory
  • lfc-rm – deletes file/directory from catalog
  • lfc-rename – renames fail/directory

Hands on task:

  1. Create directory (name it with your username) in directory >>> Ubaci putanju <<<
  2. List content of directory >>>Ubaci putanju<<<
  3. Change permissions on your folder, so that other users don't have write permission.
  4. List available Storage Elements
  5. Create file file.txt on your UI
  6. Copy file.txt on some other available SE i register file.txt in created folder
  7. List informations about that file in catalog
  8. Make replica of file on other SE
  9. Make another alias for file.txt
  10. List informations about alias
  11. Rename alias
  12. Find GUID for given alias
  13. Find SURL for given alias
  14. Register file with given SURL
  15. List all replicas for given LFN
  16. List all aliases for given LFN
  17. Download file from SE to local computer


  • lcg-cr [-d dest_file | dest_host][-h | --help][-l lfn][-v | --verbose] [--vo vo] src_file
  • lcg-cp [--vo vo] src_file dest_file
  • lcg-del [-a] [-s se] [--vo vo] file
  • lcg-rep [-d dest_file | dest_host] [--vo vo] src_file
  • lcg-aa [--vo vo] guid lfn
  • lcg-ra [--vo vo] guid lfn
  • lcg-rf [-g guid][-l lfn] [-v | --verbose] [--vo vo] surl
  • lcg-uf [--vo vo] guid surl
  • lcg-la [--vo vo] file
  • lcg-lg [--vo vo] lfn_or_surl
  • lcg-lr [--vo vo] file
  • lfc-mkdir dirname
  • lfc-chmod mode file
  • lfc-chown [-h] [-R] owner[:group] file
  • lfc-setcomment file comment
  • lfc-delcomment file
  • lfc-ln -s file [link] ili lfc-ln -s file...directory
  • lfc-ls [-cdilRTu] [--class] [--comment] [--deleted] path
  • lfc-rm [-f] [-i] file ili lfc-rm [-f] [-i] -r dirname...
  • lfc-rename oldname newname
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