Neil, I am trying to create the RAID 5 array with >mdadm -C /dev/md0 -l5 -n6 -x1 -prs /dev/hd[bcdefgh] However, I am getting the following error message; >mdadm: RUN_ARRAY failed: Invalid argument Because I used these devices as raid1, I ran ">mdadm --zero-superblock /dev/hdx" on all of these devices. But no help. Even I tried with "mkraid & raidtab" it still has the same error. Also, I tried with -f option, and with or without space between option and its value on mdadm -C. All of these devices are used as the whole disk without partition. I had no problem with RAID 0 or 1. Any clue? Thanks, Bo - 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