I'm looking at the kernel/user interface md_u.h and trying to figure out how to start a linear raid, not persistant, no superblock, from my little test program. My current plan of attack is to do 3 steps... #1. do ioctl SET_ARRAY_INFO. Which fields of mdu_array_info_t should I fill out before passing it into ioctl? #2. Add disks with ADD_NEW_DISK... one mdu_disk_info_t per disk for nr_disks (or raid_disks??) in mdu_array_info_t. #3. RUN_ARRAY or START_ARRAY ioctl. I can't figure out which to use. It seems that RUN_ARRAY requires a mdu_param_t arg. Are personality and 'level' the same thing? Is "linear" mode represented as 1? So many variables here... I want to give this a shot, but I also don't want to trash my system doing something stupid! One more question... I seem to remember that you can only have something like 12 or 27 devices per set a while back. Does this limitation still stand for non-superblock linear raids? If so, will I be able to effectively use more devices by creating multiple raids of 12 devices, and then making a raid of the raids? Thanks for your help! -Jeff - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
