The standard Grid VO registration procedure should be followed to be enable to use the resources connected with the FCC VO.
:::{admonition} Note :class: callout
You need to use a browser where you have installed your certificate and the CERN CA certificates. Firefox usually works fine, Google Chrome usually does not work. Safari might also work. :::
DIRAC is available on CernVM-FS. To enable the relevant applications and scripts, the following setup script needs to be sourced first
source /cvmfs/clicdp.cern.ch/DIRAC/bashrc
To submit jobs through DIRAC a proxy needs to be created and uploaded:
dirac-proxy-init -g fcc_user
A successful creation looks like this:
Generating proxy...
Enter Certificate password:
Added VOMS attribute /fcc
Uploading proxy..
Proxy generated:
subject : /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=ganis/CN=393971/CN=Gerardo Ganis/CN=2178341058/CN=3000266373
issuer : /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=ganis/CN=393971/CN=Gerardo Ganis/CN=2178341058
identity : /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=ganis/CN=393971/CN=Gerardo Ganis
timeleft : 23:53:58
DIRAC group : fcc_user
path : /tmp/x509up_u2759
username : ganis
properties : NormalUser
VOMS : True
VOMS fqan : ['/fcc']
Proxies uploaded:
DN | Group | Until (GMT)
/DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=ganis/CN=393971/CN=Gerardo Ganis | | 2022/05/13 12:12
The last section shows the valid proxies upload to the DIRAC system. It can also be checked with
dirac-proxy-info -m
with output similar to
subject : /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=ganis/CN=393971/CN=Gerardo Ganis/CN=2178341058/CN=3000266373
issuer : /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=ganis/CN=393971/CN=Gerardo Ganis/CN=2178341058
identity : /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=ganis/CN=393971/CN=Gerardo Ganis
timeleft : 23:50:40
DIRAC group : fcc_user
path : /tmp/x509up_u2759
username : ganis
properties : NormalUser
VOMS : True
VOMS fqan : ['/fcc']
== Proxies uploaded ==
DN | Group | Until (GMT)
/DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=ganis/CN=393971/CN=Gerardo Ganis | | 2022/05/13 12:12
If everything worked fine, your proxy should be mapped to the fcc001
user. This can be checked this way:
export EOS_MGM_URL=root://eospublic.cern.ch
XrdSecPROTOCOL=gsi,unix eos whoami
the result should look similar to this:
Virtual Identity: uid=140035 (99,140035) gid=2855 (99,2855) [authz:gsi] host=lxplus743.cern.ch domain=cern.ch geo-location=0513
At CERN the uid of fcc001
is 140035.
Once DIRAC is enabled it is possible to copy, browse and access files.
For the example we used the file edm4hep_test_output.root
.
Files can be copied in the area of each user with, for example, xrdcp
:
xrdcp edm4hep_test_output.root root://eospublic.cern.ch//eos/experiment/fcc/user/g/ganis/edm4hep_test_output.root
[5B/5B][100%][==================================================][5B/s]
The immediate availability of the file can be checked with
$ xrdfs eospublic.cern.ch ls /eos/experiment/fcc/prod/fcc/user/g/ganis
/eos/experiment/fcc/prod/fcc/user/g/ganis/edm4hep_test_output.root
or, /eos
is mounted, with
$ ls -lt /eos/experiment/fcc/prod/fcc/user/g/ganis
total 9545
-rw-r--r--. 1 fcc001 fcc-cg 9768981 Nov 3 2021 edm4hep_test_output.root
Files can be replicated to another STorage Element, e.g. CNAF-DISK, using
dirac-dms-replicate-lfn
:
$ dirac-dms-replicate-lfn /fcc/user/g/ganis/edm4hep_test_output.root CNAF-DISK
The availability of the files can be browsed using the command dirac-dms-lfn-replicas
:
$ dirac-dms-lfn-replicas /fcc/user/g/ganis/edm4hep_test_output.root
LFN StorageElement URL
=============================================================
/fcc/user/g/ganis/edm4hep_test_output.root CNAF-DISK davs://xfer-archive.cr.cnaf.infn.it:8443/fcc/user/g/ganis/edm4hep_test_output.root
CERN-DST-EOS gsiftp://eospublicftp.cern.ch//eos/experiment/fcc/prod/fcc/user/g/ganis/edm4hep_test_output.root
The file can be accessed through the indicate path; for example:
$ source /cvmfs/sw.hsf.org/key4hep/setup.sh
$ root -l
root [0] TFile *f1 = TFile::Open(“davs://xfer-archive.cr.cnaf.infn.it:8443/fcc/user/g/ganis/edm4hep_test_output.root”)
(TFile *) 0x2ec28b0
root [1]
The DIRAC web portal is available to check the status of things. It shows all the jobs submitted and the files registered.
:::{admonition} Note :class: callout
As for the VO registration, you need to use a browser where you have installed your certificate and the CERN CA certificates. Firefox usually works fine, Safari might also work. Google Chrome usually does not work. :::