Hi, I'm trying out FIO, and rand a random read job with a 12GB file. It seems that the "Laying out IO file(s) " process generates a zero-filled file. This means that when compression is activated (on ZFS), no reads actually happens. I tried adding a "buffer_compress_percentage=10" section to tell generated data should compress from only "10%" but this seems to apply only to actual benchmark job, not the 'laying out file's. Am I missing something? Thanks Michel -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html