====== Hotswap remove disk  ======

==== backup partition table ====
<code bash>
sfdisk -d /dev/sdb > partitions.sdb
</code>
==== Mark faulty and remove the drive to replace from the array ====
<code bash>
mdadm -f /dev/md0 /dev/sdb
</code>
==== Look up the Host, Channel, ID and Lun of the drive to replace, by looking in ====
<code bash>
cat /proc/scsi/scsi
</code>
==== Remove the drive from the bus: ====
<code bash>
echo "scsi remove-single-device 0 0 2 0" > /proc/scsi/scsi
</code>
==== Verify that the drive has been correctly removed, by looking in ====
<code bash>
cat /proc/scsi/scsi
</code>
===== Unplug the drive from your SCA bay, and insert a new drive =====

==== (normally done by udev) Add the new drive to the bus ====
<code bash>
echo "scsi add-single-device 0 0 2 0" > /proc/scsi/scsi
</code>
==== Restore partition table ====
<code bash>
sfdisk /dev/sdb < partitions.sdb
</code>
==== Add the drive to your array ====
<code bash>
mdadm -a /dev/md0 /dev/sdb
</code>