On Tue, 27 Mar 2018 15:32:11 +0200 Andreas Klauer <Andreas.Klauer@xxxxxxxxxxxxxx> wrote: > If you have three free slots, add your new drives, partition them > and grow your 3-drive RAID-1 to a 6-drive RAID-1. > > mdadm --grow /dev/md0 --raid-devices=6 --add /dev/newX1 /dev/newY1 /dev/newZ1 Other than showing off that you're gung-ho with command-lines, there's not a single reason in combining these two operations like this. If this was RAID5/6 with a 4 or 5 to 6 change, can you guarantee it wouldn't FIRST reshape the array onto a number of missing devices, massively degrading or eliminating redundancy, and only then would start with the "add" operation (to "fill in the blanks" and start a rebuild)? As such, combining grow and add is a very bad habit to have. First add whatever devices you have, only then start a reshape. -- With respect, Roman -- 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
