The mdadm create command is used to create a new linear RAID device, /dev/md0, using the device /dev/sdb1. The command is executed with options such as --level=1, -n 1, -f, and --raid-disk=2 to specify RAID level and disk configuration.

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mdadm --create /dev/md0 --level=1 -n 1 -f --raid-disk=2 /dev/sdb1

#!/bin/bash

# Function to create a RAID 1 array
create_raid1() {
  local device_name="/dev/md0"
  local raid_level="1"
  local num_disks="1"
  local raid_disk=${2:-2}
  local metadata_format="--metadata=1.2"
  local disk_device="/dev/sdb1"

  mdadm $metadata_format --create $device_name --level=$raid_level --raid-devices=$num_disks -f --raid-disk=$raid_disk $disk_device
}

# Call the function
create_raid1

MDADM Command

• Command: mdadm
• Subcommand: create
• Options:
  • --level=1: Specify the RAID level (1 for linear RAID)
  • -n 1: Specify the number of active devices
  • -f: Force creation, overwriting existing data
  • --raid-disk=2: Specify the starting disk number for the RAID (2)
  • /dev/md0: Specify the name of the new RAID device
  • /dev/sdb1: Specify the device to use as the RAID device

Creates a new linear RAID device /dev/md0 using /dev/sdb1 as the device