HowTo: Linux Rename a RAID Array From md0 to md2

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To rename a Linux RAID array from md0 to md2, you can follow these steps:

  1. Stop the RAID array:
sudo mdadm --stop /dev/md0
  1. Create a new RAID array with the desired name:
sudo mdadm --create /dev/md2 --level=<RAID_level> --raid-devices=<number_of_devices> <devices>

Replace <RAID_level> with the RAID level (e.g., 0, 1, 5, 6, etc.), <number_of_devices> with the number of devices in the array, and <devices> with the devices that make up the array (e.g., /dev/sda1 /dev/sdb1).

  1. Copy the data from the old array to the new array:
sudo dd if=/dev/md0 of=/dev/md2 bs=<block_size>

Replace <block_size> with the desired block size.

  1. Remove the old RAID array:
sudo mdadm --remove /dev/md0
  1. Update the /etc/mdadm.conf file to reflect the change:
sudo sed -i 's/md0/md2/g' /etc/mdadm.conf
  1. Start the new RAID array:
sudo mdadm --assemble /dev/md2

Note that these steps assume that the RAID array uses the standard Linux software RAID implementation. If you’re using a different RAID implementation, the steps may be different. Additionally, it’s important to backup your data before making any changes to a RAID array to ensure that you can recover your data in case something goes wrong. (www.contentbeta.com)

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