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Hi Andy, the problem is SFS_O_RDONLY = 0. When a "open for write" flag such as kXR_open_apnd is sent to an XRootD server it is translated to SFS_O_RDONLY. Here at CERN we are marking files within our tape backed directories as "NOT updateable". This is an EOS specific ACL. Such files should be read-only once they have been created. An "open for write" on such files including the use of the kXR_open_apnd flag should fail either with a permissions error or with a "not supported error". In order for us to detect kXR_open_apnd it must be passed through to XrdSfsFile::open() in some way. Ignoring it and passing SFS_O_RDONLY is not correct. Removing the kXR_open_apnd flag all together is another solution. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/1126#issuecomment-580133285 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1