Creating RAID 10 with mdadm on Linux (How to create RAID 10?)

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Creating RAID 10 with mdadm on Linux

1. Load the modules

modprobe raid1 raid10

2. Create partitions

fdisk /dev/nvme0n1

Set the partition type to FD (Linux RAID autodetect).

3. Copy partition layout to other disks

sfdisk -d /dev/nvme0n1 | sfdisk --force /dev/nvme1n1

sfdisk -d /dev/nvme0n1 | sfdisk --force /dev/nvme2n1

sfdisk -d /dev/nvme0n1 | sfdisk --force /dev/nvme3n1

4. Create RAID 1

mdadm --create /dev/md0 --run --level=1 --raid-devices=2 /dev/nvme0n1p1 /dev/nvme1n1p1

mdadm --create /dev/md1 --run --level=1 --raid-devices=2 /dev/nvme2n1p1 /dev/nvme3n1p1

5. Create RAID 1+0

sudo mdadm --create /dev/md2 --run --level=0 --chunk=64 --raid-devices=2 /dev/md0 /dev/md1

6. Create a filesystem on RAID 10

mkfs.xfs /dev/md2

7. Edit /etc/mdadm.conf

Add the following entries:

DEVICE containers partitions

ARRAY /dev/md0 UUID=UUID

ARRAY /dev/md1 UUID=UUID

ARRAY /dev/md2 UUID=UUID

8. Find UUIDs

mdadm -D /dev/md0 | grep UUID

mdadm -D /dev/md1 | grep UUID

mdadm -D /dev/md2 | grep UUID

9. Edit /etc/fstab

/dev/md2 /mnt xfs defaults 1 2

10. Mount the RAID device

mount /mnt

Related Pages:

  1. Tools - TestDisk (Partition table recovery)
  2. RAID Types 0, 1, 5, 6, 10, 50, 60 & RAID Calculator (What RAID level to choose for a server?)
  3. RAID Settings impact on Performance (How to improve RAID performance?)(RAID Settings)
  4. Other factors affecting RAID performance (RAID Settings)