On 02/17/2017 09:33 PM, Boylan, Ross wrote: > I got "mdadm: can only add devices to linear arrays" when I did not > expect it. Can anyone explain what's going on, and what the right > way to handle the situation is? > > In brief, I had a raid1 set for 2 devices, but with only 1. I tried > adding a 2nd. I think you simply misunderstood the use of --grow. All you needed was --add to place a new device in the empty slot. Use --grow to change the layout or number of devices of a non-degraded array. Use --add, --fail, and --remove to manage the devices in an array without changing its structure. Often, you see --grow with an --add because a spare is needed for the structural changes one is commanding, and it is fine to combine the operations (adding a spare then growing onto it). Phil -- 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
