On 13/07/15 00:33, Adam Goryachev wrote: > Also, for your raid1, never have a hot spare, just do this: > mdadm /dev/mdX --grow --raid-devices=3 > Then you will always have all your data replicated on all three drives, > so again, no hot spare required. Never say never, as there are valid use cases for having hot spares in a RAID1 set. My own use case is that I want to be reasonably assured that my spare won't fail at around the same time as the active disks (due to having the same age and having been subjected to exactly the same workload). -- 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