On Tue, Mar 27, 2018 at 10:51:06AM +0200, Gandalf Corvotempesta wrote: > # mdadm --detail /dev/md0 > /dev/md0: > Version : 1.2 > Raid Level : raid1 > Raid Devices : 3 > (I have 3 free slots in this server). 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 mdadm --wait /dev/md0 # and/or watch cat /proc/mdstat When the sync is done, you can fail the old drives. mdadm /dev/md0 --fail /dev/oldA1 /dev/oldB1 /dev/oldC1 And reduce the number of drives back to 3. mdadm --grow /dev/md0 --raid-devices=3 Finally grow the RAID size to max. mdadm --grow /dev/md0 --size=max Of course the last step only works if you added large partitions... Regards Andreas Klauer -- 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
