+allocate storage for a file. Setting the starting OST index for a file
+.RI ( stripe_number =0)
+is supported with all versions of Lustre, and other stripes in the file
+will be assigned sequentially by the filesystem. Setting the OST indices
+other than stripe 0 is only supported with Lustre 2.7 and later, and will
+return an error at file creation time for 2.6 and earlier.