This is an old revision of the document!
RAID
Copy Partition Scheme
Save to file
sfdisk -d /dev/sda > partitions
Restore from File and force
sfdisk --force /dev/sda < partitions
In one step
sfdisk -d /dev/sda | sfdisk /dev/sdb
Get Disk Serial
Using smartctl
smartctl -i /dev/sda
Check RAID Status
cat /proc/mdstat
Remove a Malfunctioning Disk
Do the Folloing for all partitions of the malfunctioning disk. Note that mark as faill is not necessary or even possible in case the disk is not detected anymore from the OS.
Mark partition as failed
mdadm --manage /dev/md0 --fail /dev/sda1
Remove Partition
mdadm --manage /dev/md0 --remove /dev/sda1
Add New Disk in Array
Repeat for all required partitions
mdadm --manage /dev/md0 --add /dev/sda1