Stage Files in the DiracFileCatalog

If a StorageElement uses a tape backend file access can be slow (e.g.: CERN-SRM). To speed up the access the StorageElement should be told which files will be used. This is done via the dirac-stager-stage-files command.

First obtain the list of files. Check on which StorageElement the files are located by identifying available file replicas. This can be done for example with the dirac-dms-lfn-replicas command or in the file catalog CLI. Then issue the command. The command will not give an error if wrong files or StorageElements are given as input.

To see if files are being staged use dirac-stager-monitor-file. Once the file has been staged the staging request is removed from the Database and this command will return that the file has no staging request pending.

-- AndreSailer - 21 Feb 2014