Software RAID Recovery
To simulate disk failure
# mdadm /dev/md0 -f /dev/sda1
Recovering from a software RAID disk failure
Replace and reboot, or hot-remove if hardware supports it
# mdadm /dev/md0 -r /dev/sda1
Add replacement partition into array
# mdadm /dev/md0 -a /dev/sda1
To disassemble/stop a disk array
# mdadm -S /dev/md0

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