Writing to EOS¶

The Purdue EOS storage is mounted read-only at /eos/purdue/. To write files to EOS (for example, to your Grid directory /store/user/<cern-username>/), use the gfal or xrdcp/xrdfs commands. Where to stage outputs before copying them is in Storage volumes.

Both tools need a valid VOMS proxy, are available in every terminal, and are documented at the Purdue Tier-2 CMS site.

Using xrdcp and xrdfs¶

For example:

# copy a local file to your Grid directory on Purdue EOS
xrdcp /tmp/$USER/output.root root://eos.cms.rcac.purdue.edu//store/user/<cern-username>/output.root

# list the contents of a directory
xrdfs root://eos.cms.rcac.purdue.edu ls /store/user/<cern-username>/

Using gfal¶

For example:

gfal-copy /tmp/$USER/output.root root://eos.cms.rcac.purdue.edu//store/user/<cern-username>/output.root