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1. Mark faulty drive as "failed":

<tt>mdadm --fail /dev/md1 /dev/sdb1</tt>

2. Remove drive:

<tt>mdadm --remove /dev/md1 /dev/sdb1</tt>

3. Copy partition table:

<tt>sfdisk -d /dev/sda | sfdisk /dev/sdb</tt>

4. Add new partitions to arrays:

<tt>mdadm --add /dev/md1 /dev/sdb1</tt>

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