Remote access to Castor data
for data analysis
Kilian Schwarz
Direct gridftp based access
• grid-proxy-init
• globus-url-copy –dbg –vb –bs 262144 –tcp-bs
2621440
gsiftp://castorgrid03.cern.ch/castor/cern.ch/user/
p/phristov/trdtest1/751796/genTracks.root
file:////home/kschwarz/test.root
• disadvantage: one has to know where the files
are located
• Currently only on alice.fzk.de or grid5.gsi.de
(Firewall doors to be opened)
AliEn2/PROOF
• Still music of the future:
• All data have to be migrated to Castor2
• Not all ROOT modifications necessary for
AliEn2 are in CVS so far
• AliRoot analysis class has to be modified
so that AliEn data sets can be read in
correctly (P.Hristov has still 2 weeks of
holidays)
AliEn2 + PROOF the way it should
work
• In ROOT/PROOF
TGrid::Connect(“alien:aliendb5.cern.ch”,”aliprod”
)
TAlienCollection* collection =
TAlienCollection:Query(“”,”” for example “*miniesd.root”
,);
TDSet * analysisdataset = collection--
>GetDataset(“TTree”,”esdTree”);
gProof->Process(“myAnalasis.C”)
AliEn2 GUI (in development)
AliEn2 GUI
AliEn2 GUI
AliEn2 GUI
AliEn2 GUI
AliEn2 GUI