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URL:
  <http://savannah.cern.ch/support/?136127>

                 Summary: RFE: allow NOT to publish in a redirector GPFS
files which are on tape onnly
                 Project: XROOTD
            Submitted by: boccali
            Submitted on: 2013-02-25 16:58
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: None

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Details:

As explained in ticket #135998:

At CNAF we have GPFS + TSM tape backend, and files are logically always
present in GPFS. But, when files are on tape only, they appear in GPFS (via
stat()) with the real size, but 0 blocks.

more precisely, 
int result = stat64(fileName, &buf); 
while buf.st_size is in all cases the real size, buf.st_blocks is 0 if the
file is only on tape, a reasonable >0 number otherwise. 

We would like to "publish" to the redirector just the files which are on
disk, in a way that remote xrootd requests cannot cause tape recall
storms...

tommaso




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