Difference: LHCComputingGrid (6 vs. 7)

> lfc-mkdir -m 755 /grid/cms/user_name/some_directory (Here, the -m xxx option is optional, this sets the permissions of the directory. All logical file names begin with /grid/virtual_organization. If you are a new user, the directory /grid/virtual_organization/user_name will not exist initially: you have to create it first, if you want an own directory. It is recommended to restrict write permissions like in the example.)

There are various commands to manage logical file names, all beginning with lfc-, like lfc-chmod, lfc-getacl, lfc-setacl, lfc-chown, lfc-ln, lfc-rename, lfc-ls, lfc-rm, lfc-mkdir etc. Refer to the man pages of these commands, but the usage of these should be self-explanatory.

As the given logical directory is ready, one can copy files into it. If you want to store a file in the LCG storage infrastructure permanently, copying a file is not enough: you have to register the file in the logical file catalogue. It is done like:

> lcg-cr --vo cms -d grid100.kfki.hu -l lfn:/grid/cms/alaszlo/destionation/testfile.txt \
                                                    file:/afs/kfki.hu/home/alaszlo/source/testfile.txt

> lcg-cp --vo cms lfn:/grid/cms/alaszlo/some_directory/test_file.txt file:$PWD/test_file.txt

There are various commands to manage the stored files (e.g. unregister and delete them, or create replicas), all beginning with lcg-, like lcg-rep, lcg-aa, lcg-rf, lcg-cp, lcg-cr, lcg-la, lcg-uf, lcg-del, lcg-lg, lcg-lr, lcg-gt, lcg-ra etc. Refer to the man peges of these commands, but most of them are self-explanatory.

Unfortunately, one cannot copy and register complete directory trees. Therefore, I wrote a shell script wrapper to do this:

> lcgcr.sh source_directory destination_directory_lfn (You can find this here: lcgcr.sh.)

Note: unfortunately, I encountered that the lcg-cr action often fails (this should be remedied in future). Therefore, it is convenient to put an lcg-cr command into a checker loop:

RESULT = 1
while (( $RESULT != 0 )) ; do
    lcg-cr --vo cms -d grid100.kfki.hu \
        -l lfn:/grid/cms/alaszlo/destintation/test_file.txt \
            file:/afs/kfki.hu/home/alaszlo/source/test_file.txt
    RESULT = $?
    if (( $RESULT != 0 )) ; then sleep 1m ; fi
done

This precaution may also be recommended for lcg-cp.

-- AndrasLaszlo - 06 Mar 2006