Is there a way to control the alignment of I/O offsets? The HOWTO shows bsrange= and bs_unaligned=, but these seem to be related to the size of the I/O, not the offset. In our lab testing it appears from blktrace dumps that I/Os are boundary-aligned based on the size of the I/O. For example, in a test of 64KB Random Reads all the I/O addresses were multiples of 64KB (128 sectors). This alignment has a profound impact on I/O performance for certain disk array configurations. Ideally we'd like to be able to control the alignment to match our customers' run-time environment. -- 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
