Raid
Copy table1
sfdisk -d /dev/sdb | sfdisk -f /dev/sda
Create raid1
mdadm --create --verbose /dev/md2 --level=1 --raid-devices=2 /dev/sdc /dev/sdd
Add disk to raid1
mdadm --manage /dev/md0 --add /dev/sda1
Speed up rebuild1
echo 50000 > /proc/sys/dev/raid/speed_limit_min