error on stopping the array

 mdadm --manage --stop /dev/md127
 Device or resource busy

stopping /dev/md127

 dmsetup remove_all
 mdadm --manage --stop /dev/md127
 mdadm: stopped /dev/md127

starting /dev/md127 again

 mdadm --assemble --scan

adding a new disk to the array

 mdadm --manage /dev/md1 --add /dev/sdb2


http://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array

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