Linux Soft RAID

• Examine state: cat /proc/mdstat, sudo mdadm --detail /dev/md0
• Remove RAID device: sudo mdadm --stop /dev/md0
• Create RAID0: sudo mdadm --create --verbose /dev/md0 --level=0 --raid-devices=2 /dev/sda /dev/sdb
• RAID device persistence (after assembling finished): sudo mdadm --detail --scan | sudo tee -a /etc/mdadm/mdadm.conf
• Import existing RAID: auto sudo mdadm --assemble --scan, manual sudo mdadm --assemble /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1, pass --update=devicesize if underlying partition size has changed
• Replace failed drive: sudo mdadm -–manage /dev/md0 -–remove /dev/sda1, sudo mdadm -–manage /dev/md2 -–add /dev/sdb1

References:

• https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu

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