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On Tue, 29 Nov 2022, maksiks wrote:

>> From your response is that I should put into the config
> oss.statlib /cms/.../statlib.py
> where statlib.py would by my custom script that will return what is needed?
Not quite. The plugin needs to be written in C++. An example of such a 
plugin can be found in xrootd/src/XrdOss/XrdOssSIgpfsT.cc which is a stat 
plugin for gpfs that is used to prohibit access to files that no longer 
online. The way you package a stat plugin (i.e. create a shared library) 
is shown in xrootd/src/XrdPlugins.cmake (see variable LIB_XRD_GPFS).

Your plugin needs to set the following flags in st_rdev XRDSFS_OFFLINE and 
XRDSFS_HASBKUP, as appropriate. These are defined in XrdSfs/XrdSfsFlags.hh

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