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Hi XRootd Community, We here at DESY were working on interfacing XRootd with dCache. Currently we need the stage-in capability from dCache (which in this case is MSS) into XRootd local folder. And also we need a Migration tool from XRootd local folder into MSS (dCache). We use the oss.msgwcmd and oss.stagecmd directives. Also the oss.rcreate directive is set. Well, whenever the StageIn command is called everything works fine and the files are staged ok. But we have some problems with Flushing files to MSS. Calling "msstalk create mssfn mode" in the most straightforward way does not work. It seems to us that 1. The "create" command is called BEFORE the actual file was written into the local folder by xrdcp. So there is nothing to flush. 2. It is kind of unknown when the file should be start to being flushed. 3. "create" should first touch the file on MSS, return "0" saying that evrything is ok and then it can actually flush the file. Otherwise the flushing does not work. So we wonder how actually the create should function and how it should communicate with XRootd? What kind of logic should be behind the implementation of create part of oss.mssgwcmd command? Volodymyr Kapchynskyy, DESY