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Hi, Now that I have an libXrdPosixPreload.so to use, I am running into problems getting this to work. I am trying to set it up to support a gridftp server but I thought I would first start with a presumably simpler case. I just want to use "ls" against a file. The README file for XrdPosix implies that this should work. I have a file available in the name space that can be copied back to the client machine, via our redirector: [mcguigan@gk01 ~]$ /opt/xrootd/bin/xrdcp root://xrdb.local:1094//xrd/test1/100mb /tmp/wood [xrootd] Total 95.37 MB |====================| 100.00 % [115.2 MB/s] I created the following xrdrun.sh file: #!/bin/sh export XROOTD_VMP='xrd.local:1094:/xroot/=/xrd/' export LD_LIBRARY_PATH=/opt/xrootd/lib/ export LD_DEBUG=libs export LD_PRELOAD=/opt/xrootd/lib/libXrdPosixPreload.so export XRDPOSIX_DEBUG=3 $* Shouldn't this allow me to do: ./xrdrun.sh ls /xroot/test1/100mb ./xrdrun.sh ls root://xrdb.local:1094//xrd/test1/100mb I receive the message "No such file or directory error" from the ls. With the LD_DEBUG statement I can see that the pre-load library is being loaded and initialized just prior to ls being loaded. Also, if I malform the VMP environment varialble, I will get an Invalid map message from XrdPosix. I don't get any information by setting XRDPOSIX_DEBUG. Should this work? How can I debug this? I tried rebuilding the XrdPosix libraries with a couple of very simple output statements in XrdPosixXrootPath::URL but I get seg faults when I try to use them. I am working on SL4.5 X86_64. Any advice is greatly appreciated. Patrick