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Using lfs setstripe on stampede

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Using lfs setstripe on stampede
stampede scratch setstripe
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6/25/13 6:33 PM
When writing a 15 GB file on the stampede $SCRATCH file system, our application (Qbox) achieves an aggregate write rate of 85 MB/s (writing from 1024 tasks using MPI-IO). On ranger, we used to improve this considerably by setting the stripe count of the file (before writing it) using lfs setstripe -c 32 filename.
We tried this on stampede, but it causes the MPI-IO call to hang and the resulting file size is zero.
Does anyone know how to use striped files on stampede?
Thanks
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