GridSubmission withCrab

CRAB submission to the GRID

Aim

• This page describes details about the usage of CRAB at the IIHE. This page does not aim to explain CRAB.
• For general information on how to use Crab, we strongly advise you to go to the following link and also this one
• In case of troubles with CRAB, before sending a mail to the T2 admins or to the "Crab Feedback" Hypernews mailing list, please read this
• More information on running with crab on the grid can be found in the CMS workbook
• A list with Frequently Asked Questions can be found here
• Please subscribe to hn-cms-crabFeedback@cern.ch and to hn-cms-crabDevelopment@cern.ch for staying up to date on problems and developments

Procedure

CMSSW environment

• CMSSW enviroment is under variable VO_CMS_SW_DIR is the correct release. (This also means that this variable will not have to be set manually anymore)

source $VO_CMS_SW_DIR/cmsset_default.sh

source $VO_CMS_SW_DIR/cmsset_default.csh

Crab environment

CRAB is available under cvmfs

• For CRAB3

source /cvmfs/cms.cern.ch/crab3/crab.sh
or
source /cvmfs/cms.cern.ch/crab3/crab.csh

• For CRAB2 (almost deprecated)

source /cvmfs/cms.cern.ch/crab/crab.sh
or
source /cvmfs/cms.cern.ch/crab/crab.csh

becms group

• becms is a group within the VO CMS.
• you have a unique account name in CMS. This is your SiteDB account.
  • you also should have an account with that login under the new UIs
  • try m0.iihe.ac.be
  • login is based on rsa keys. Talk to the admins if you can not login.
• Requirements:
  • Have an account in /cms/becms group and be registered in SiteDB
  • Instructions
• This group gives you write access to your personal /store/user path on the storage
  • at least for IIHE
  • everyone else has read access
  • you are not able to write to /pnfs/iihe/cms
  • the location where you should be able to find your data is /pnfs/iihe/cms/store/user/<username>
• add to crab.cfg
• for CRAB2:

[GRID]
virtual_organization    = cms
group                   = becms

• for CRAB3:

config.section_("User")
config.User.voGroup = 'becms'

• To create a valid proxy you have to issue the following command

voms-proxy-init --voms cms:/cms/becms

• If you want to test your access to the storage via the CRAB3 option checkwrite you need to issue the following command:

crab checkwrite --site=T2_BE_IIHE --voGroup=becms

Data Publication

You'll find all information [here https://twiki.cern.ch/twiki/bin/view/CMS/SWGuideCrabForPublication]

Using the crab server or not: only for CRAB2

• According to the Crab software guide it is recommended to use the crab server.
• In most crab tutorials you will see that you are given the choice between using the glite with our without the server. Although there is a 3rd possibility. If you read the crab FAQ you will see a short comparison on using the glite-server or the glidein-server.

Comments and FAQ

• autocompletion with csh doesn't seem to work
  • actually, is seems to work as intended
  • TAB only completes unambigous prefixes
  • use CTRL-D to list all possible matches
• as the old /user is not mounted, you will need to recreate the $HOME/.globus directory and copy your usercert.pem and userkey.pem files.
  • don't forget to check the permissions of the files.