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mdadm -r /dev/md0 /dev/sdb1
dd if=/dev/sda of=/dev/sdb bs=512 count=1
echo 1 > /sys/block/sdb/device/rescan
or reboot
mdadm -a /dev/md0 /dev/sdb1
# Links
http://www.cyberciti.biz/faq/debian-ubuntu-reload-partition-table/
http://linuxwiki.de/mdadm