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When using an OSS plug-in using the default OFS implementation, the OFS disables asynchronous reads if 'isCompressed' is not implemented by the OSS.

I suggest the default behaviour of the OFS to assume not compressed if the detection is not implemented (-EISDIR response by XrdOssDF).

XrdOfs.cc:
// Set compression values and activate the handle
//
if (oP.fP->isCompressed())
   {oP.hP->isCompressed = 1;
   dorawio = (open_mode & SFS_O_RAWIO ? 1 : 0);
}

XrdOss.hh:
virtual int isCompressed(char *cxidp=0) {(void)cxidp; return -EISDIR;}

Is there actually anything implemented with compression?

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