For example, I have the following in xrootd config:

all.export /data
oss.localroot /tmp

For a test, I use an dummy N2N that does nothing but return a pfn=lfn. When user access this file /data/myfile, xrootd will call XrdOucName2Name::lfn2pfn(lfn=/data/myfile, pfn, len).

If I return pfn=/data/myfile, xrootd will tell user that the file is not found / can not open. If I return pfn=/tmp/data/myfile, then everything will be OK.

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