Replace mdadm

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1. Mark faulty drive as "failed":

mdadm --fail /dev/md1 /dev/sdb1

2. Remove drive:

mdadm --remove /dev/md1 /dev/sdb1

3. Copy partition table:

sfdisk -d /dev/sda | sfdisk /dev/sdb

4. Add new partitions to arrays:

mdadm --add /dev/md1 /dev/sdb1

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