All, I want to ensure that unique thread targeted the given LBA span, is there a way to achieve it using "raw" drive [thread1] size= LBA 0-50% [thread2] size= LBA 51-80% [thread3] size= 80-20% Another thing: When FIO start a workload e.g. Random Read does it always starts from LBA0 i.e. random_wr = size 100% (dirve written in a given pattern) then. random rd 4k [ LBA 0 ....] stonewall random rd 8k [ Will this also start from LBA 0 or pick some random offset for start] Appreciate your support here . -- Life is too short for silly things so invest your time in some productive outputs!! -- 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