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If the server cache is unwritable, or it's not possible to create the necessary directories, then data access from the client fails in a confusing way - the server returns no data instead of an error. For example, my cache directory is /stash, and I deliberately make it impossible to cache new files in a particular directory
# chmod 0111 /stash//pnfs/fnal.gov/usr/nova/data/flux/gsimple/nova_v06/nd/mn
then xrdcp fails like this:
$ XRD_LOGLEVEL=Error xrdcp -f root://fermicloud058.fnal.gov//pnfs/fnal.gov/usr/nova/data/flux/gsimple/nova_v06/nd/mn/rhc/gsimple_NOvA-ND_mn000z-200i_rp11_bs1.1_pnut_lowth_f11f093bbird_target_q34_00001.root /tmp/
[0B/330.8MB][ 0%][> ][0B/s]
[2015-07-09 16:54:54.291474 -0500][Error ][Utility ] The declared source size is 346873679 bytes, but received 0 bytes.
Run: [ERROR] Received corrupted data
and anything using the POSIX read function just gets a zero return value with no error.
If pss.trace is enabled on the server you get a message that doesn't really explain what is wrong
[2015-07-09 17:10:54.961823 -0500][Error ][App ] Prefetch::Open() can't get data-FD for /stash/pnfs/fnal.gov/usr/nova/data/flux/gsimple/nova_v06/nd/mn/rhc/gsimple_NOvA-ND_mn000z-200i_rp11_bs1.1_pnut_lowth_f11f093bbird_target_q34_00001.root /stash/pnfs/fnal.gov/usr/nova/data/flux/gsimple/nova_v06/nd/mn/rhc/gsimple_NOvA-ND_mn000z-200i_rp11_bs1.1_pnut_lowth_f11f093bbird_target_q34_00001.root
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