On Monday August 20, dattanchu@xxxxxxxxx wrote: > I am currently running 2.6.22.1 kernel with mdadm version 2.6.2. That combination should work. > > When I try to run > mdadm --grow /dev/md2 --add /dev/sdd1 > mdadm: Cannot add new disk to this array Odd. I tried add a drive to a three-drive linear array and it worked, though my drives are somewhat smaller than yours - that shouldn't matter though. Do you get any kernel messages at the time when you try to add? dmesg | tail -20 NeilBrown - 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