On Wed, 9 Dec 2009 20:31:54 +0530 <senthilkumar.muthukalai@xxxxxxxxx> wrote: > Hi, > > I am trying to add a disk to a Linear Raid which was created with 2 > disks. > We use linux-2.6.18 and mdadm-2.6.4. > I guess these support the above mentioned disk addition. Yes, should work. This functionality was introduced in 2.6.18. > root@NAS00226b1755a0 ~]# mdadm /dev/md0 --grow --add /dev/sata3 This is the correct usage but, > mdadm: Cannot add new disk to this array This indicates that something went wrong. Do you get any messages in the kernel logs at this point? 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