We go first restore the raid on partition 8 and 9
So do
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mdadm --zero-superblock /dev/sdb8
mdadm --zero-superblock /dev/sdb9
mdadm --assemble /dev/md1 /dev/sda8 --run
mdadm --assemble /dev/md2 /dev/sda9 --run
post
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cat /proc/mdstat
You should see now 2 active raid1
In this case do
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mdadm --manage /dev/md1 --add /dev/sdb8
mdadm --manage /dev/md2--add /dev/sdb9
post again
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cat /proc/mdstat