The old system had only sda and sdb in raid1. Now I've made a linear array with sda and sdb and created a new raid1 array with sdd. >>Is there something wrong with my setup? >Do you have any reason to think so? Yes, because yesterday I've update the kernel and grub complained about "raid array -1 not found". Also why sda and sdb have both a partition defined as "linux raid" but sdd doesn't? Where is the correct way to create an array? If I remember correctly these are the steps I did: 0) The system was /dev/sda1 /dev/sdb1 in raid1 (dev/md0) with a LVM partition on top of the raid 1) I created a new degradeted raid 1 /dev/md1 array with /dev/sdd (without defining any partition) 2) I've mounted /dev/md1 and formatted as ext4. Then I copied everything from /dev/md0 3) I destroyed the old /dev/md0 and than recreated a new /dev/md0 as a linear array 4) I've added /dev/md0 on /dev/md1 and the drivers start syncying Than I've update the kernel and grub complained about "raid array -1". When I restarted the system a Grub error 17 was showed. So I booted from an usb key and restored grub (I think I installed it wrongly on /dev/sda instead of the correct drive /dev/sdc) and the system booted correctly. -- Federico Foschini. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html