From 6b98da675af5df659cf987ff97d2aae5259c282b Mon Sep 17 00:00:00 2001 From: Andre Sailer <andre.philippe.sailer@cern.ch> Date: Wed, 18 Oct 2017 16:33:48 +0200 Subject: [PATCH] Docs:FAQ: add info about staging files --- docs/Files/UserGuide/faq.rst | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/docs/Files/UserGuide/faq.rst b/docs/Files/UserGuide/faq.rst index 68c189c4c..7a0adb79f 100644 --- a/docs/Files/UserGuide/faq.rst +++ b/docs/Files/UserGuide/faq.rst @@ -63,6 +63,29 @@ Or use the replicate command in the :doc:`UserGuide/CommandReference/DataManagem See the list of available :ref:`storageelements` +How to stage files +`````````````````` + +If a Storage Element uses a tape back-end file access can be slow (e.g.: +CERN-SRM). To speed up the access the :ref:`storageelements` should be told +which files will be used. This is done via the +:doc:`AdministratorGuide/CommandReference/dirac-stager-stage-files` command. + +First obtain the list of files. Check on which Storage Element the files are +located by identifying available file replicas. This can be done for example +with the :doc:`UserGuide/CommandReference/DataManagement/dirac-dms-lfn-replicas` +command or in the :doc:`UserGuide/CommandReference/DataManagement/dirac-dms-filecatalog-cli`. Then issue the command. + +.. note:: + + The command will not give an error if wrong files or Storage Elements 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. + + Jobs ---- -- GitLab